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Implements and tests the optimizer hints DERIVED_CONDITION_PUSHDOWN and NO_DERIVED_CONDITION_PUSHDOWN, table-level hints to enable and disable, respectively, the condition pushdown for derived tables which is typically controlled by the condition_pushdown_for_derived optimizer switch. Implements and tests the optimizer hints MERGE and NO_MERGE, table-level hints to enable and disable, respectively, the derived_merge optimization which is typically controlled by the derived_merge optimizer switch. Sometimes hints need to be fixed before TABLE instances are available, but after TABLE_LIST instances have been created (as in the cases of MERGE and NO_MERGE). This commit introduces a new function called fix_hints_for_derived_table to allow early hint fixing for derived tables, using only a TABLE_LIST instance (so long as such hints are not index-level).
2210 lines
65 KiB
Text
2210 lines
65 KiB
Text
create table t1 (a int, b int, c int);
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create table t2 (a int, b int, c int, d decimal);
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insert into t1 values
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(1,21,345), (1,33,7), (8,33,114), (1,21,500), (1,19,107), (5,14,787),
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(8,33,123), (9,10,211), (5,16,207), (1,33,988), (5,27,132), (1,21,104),
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(6,20,309), (6,20,315), (1,21,101), (8,33,404), (9,10,800), (1,21,123),
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(7,11,708), (6,20,214);
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create index t1_a on t1 (a);
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insert into t2 values
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(2,3,207,207.0000), (1,21,909,12.0000), (7,13,312,406.0000),
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(8,64,248,107.0000), (6,20,315,279.3333), (1,19,203,107.0000),
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(8,80,800,314.0000), (3,12,231,190.0000), (6,23,303,909.0000);
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Warnings:
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Note 1265 Data truncated for column 'd' at row 5
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create view v1 as select a, b, max(c) as max_c, avg(c) as avg_c from t1
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group by a,b having max_c < 707;
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create table t3 select 2*seq as a, 2*seq+1 as b from seq_0_to_1000;
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CREATE TABLE t4 (a INT, b INT);
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INSERT INTO t4 VALUES (1,2),(2,3),(3,4);
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create table t5 select seq as i, 10*seq as j from seq_1_to_10;
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create view v2 as select * from t5;
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create table t6 (a int primary key);
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insert into t6 select * from seq_1_to_50;
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create view v6 as select a from t6 where a mod 2 = 1;
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set @save_optimizer_switch=@@optimizer_switch;
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set session optimizer_switch='condition_pushdown_for_derived=on';
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explain format=json select /*+ NO_DERIVED_CONDITION_PUSHDOWN(v1) */ * from v1,t2 where
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((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
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((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a));
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EXPLAIN
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{
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"query_block": {
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"select_id": 1,
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"cost": "COST_REPLACED",
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"nested_loop": [
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{
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"table": {
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"table_name": "t2",
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"access_type": "ALL",
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"loops": 1,
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"rows": 9,
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"cost": "COST_REPLACED",
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"filtered": 100
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}
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},
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{
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"block-nl-join": {
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"table": {
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"table_name": "<derived2>",
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"access_type": "ALL",
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"loops": 9,
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"rows": 20,
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"cost": "COST_REPLACED",
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"filtered": 100,
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"attached_condition": "v1.max_c > 300 or v1.max_c < 135"
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},
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"buffer_type": "flat",
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"buffer_size": "238",
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"join_type": "BNL",
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"attached_condition": "v1.b = t2.b and v1.max_c > 300 and v1.avg_c > t2.d or v1.a = t2.a and v1.max_c < 135 and v1.max_c < t2.c",
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"materialized": {
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"query_block": {
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"select_id": 2,
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"cost": "COST_REPLACED",
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"having_condition": "max_c < 707",
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"filesort": {
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"sort_key": "t1.a, t1.b",
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"temporary_table": {
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"nested_loop": [
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{
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"table": {
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"table_name": "t1",
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"access_type": "ALL",
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"loops": 1,
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"rows": 20,
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"cost": "COST_REPLACED",
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"filtered": 100
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}
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}
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]
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}
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}
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}
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}
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}
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}
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]
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}
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}
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select /*+ NO_DERIVED_CONDITION_PUSHDOWN(v1) */ * from v1,t2 where
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((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
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((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a));
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a b max_c avg_c a b c d
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1 19 107 107.0000 1 21 909 12
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1 19 107 107.0000 1 19 203 107
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1 21 500 234.6000 1 21 909 12
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6 20 315 279.3333 6 20 315 279
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select * from v1,t2 where
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((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
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((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a));
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a b max_c avg_c a b c d
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1 19 107 107.0000 1 21 909 12
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1 19 107 107.0000 1 19 203 107
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1 21 500 234.6000 1 21 909 12
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6 20 315 279.3333 6 20 315 279
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explain format=json with cte as (
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select /*+ QB_NAME(qb1) */ max_c, avg_c from v1,t2 where
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((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
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((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a)))
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select /*+ NO_DERIVED_CONDITION_PUSHDOWN(v1@qb1) */ * from cte;
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EXPLAIN
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{
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"query_block": {
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"select_id": 1,
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"cost": "COST_REPLACED",
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"nested_loop": [
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{
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"table": {
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"table_name": "t2",
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"access_type": "ALL",
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"loops": 1,
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"rows": 9,
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"cost": "COST_REPLACED",
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"filtered": 100
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}
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},
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{
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"block-nl-join": {
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"table": {
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"table_name": "<derived3>",
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"access_type": "ALL",
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"loops": 9,
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"rows": 20,
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"cost": "COST_REPLACED",
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"filtered": 100,
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"attached_condition": "v1.max_c > 300 or v1.max_c < 135"
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},
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"buffer_type": "flat",
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"buffer_size": "238",
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"join_type": "BNL",
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"attached_condition": "v1.b = t2.b and v1.max_c > 300 and v1.avg_c > t2.d or v1.a = t2.a and v1.max_c < 135 and v1.max_c < t2.c",
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"materialized": {
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"query_block": {
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"select_id": 3,
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"cost": "COST_REPLACED",
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"having_condition": "max_c < 707",
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"filesort": {
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"sort_key": "t1.a, t1.b",
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"temporary_table": {
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"nested_loop": [
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{
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"table": {
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"table_name": "t1",
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"access_type": "ALL",
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"loops": 1,
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"rows": 20,
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"cost": "COST_REPLACED",
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"filtered": 100
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}
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}
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]
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}
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}
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}
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}
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}
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}
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]
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}
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}
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with cte as (
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select /*+ QB_NAME(qb1) */ max_c, avg_c from v1,t2 where
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((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
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((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a)))
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select /*+ NO_DERIVED_CONDITION_PUSHDOWN(v1@qb1) */ * from cte;
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max_c avg_c
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107 107.0000
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107 107.0000
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500 234.6000
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315 279.3333
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with cte as (
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select /*+ QB_NAME(qb1) */ max_c, avg_c from v1,t2 where
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((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
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((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a)))
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select * from cte;
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max_c avg_c
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107 107.0000
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107 107.0000
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500 234.6000
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315 279.3333
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explain format=json with recursive cte as (
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select max_c, avg_c from v1,t2 where
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((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
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((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a))
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union
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select * from cte where max_c < 100
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) select /*+ NO_DERIVED_CONDITION_PUSHDOWN(cte) */ * from cte;
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EXPLAIN
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{
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"query_block": {
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"select_id": 1,
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"cost": "COST_REPLACED",
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"nested_loop": [
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{
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"table": {
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"table_name": "<derived2>",
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"access_type": "ALL",
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"loops": 1,
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"rows": 180,
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"cost": "COST_REPLACED",
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"filtered": 100,
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"materialized": {
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"query_block": {
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"recursive_union": {
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"table_name": "<union2,3>",
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"access_type": "ALL",
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"query_specifications": [
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{
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"query_block": {
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"select_id": 2,
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"cost": "COST_REPLACED",
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"nested_loop": [
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{
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"table": {
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"table_name": "t2",
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"access_type": "ALL",
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"loops": 1,
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"rows": 9,
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"cost": "COST_REPLACED",
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"filtered": 100
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}
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},
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{
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"block-nl-join": {
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"table": {
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"table_name": "<derived4>",
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"access_type": "ALL",
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"loops": 9,
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"rows": 20,
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"cost": "COST_REPLACED",
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"filtered": 100,
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"attached_condition": "v1.max_c > 300 or v1.max_c < 135"
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},
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"buffer_type": "flat",
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"buffer_size": "238",
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"join_type": "BNL",
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"attached_condition": "v1.b = t2.b and v1.max_c > 300 and v1.avg_c > t2.d or v1.a = t2.a and v1.max_c < 135 and v1.max_c < t2.c",
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"materialized": {
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"query_block": {
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"select_id": 4,
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"cost": "COST_REPLACED",
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"having_condition": "max_c < 707",
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"filesort": {
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"sort_key": "t1.a, t1.b",
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"temporary_table": {
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"nested_loop": [
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{
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"table": {
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"table_name": "t1",
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"access_type": "ALL",
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"loops": 1,
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"rows": 20,
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"cost": "COST_REPLACED",
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"filtered": 100
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}
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}
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]
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}
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}
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}
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}
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}
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}
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]
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}
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},
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{
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"query_block": {
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"select_id": 3,
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"operation": "UNION",
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"cost": "COST_REPLACED",
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"nested_loop": [
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{
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"table": {
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"table_name": "<derived2>",
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"access_type": "ALL",
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"loops": 1,
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"rows": 180,
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"cost": "COST_REPLACED",
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"filtered": 100,
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"attached_condition": "cte.max_c < 100"
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}
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}
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]
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}
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}
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]
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}
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}
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}
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}
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}
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]
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}
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}
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with recursive cte as (
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select max_c, avg_c from v1,t2 where
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((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
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((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a))
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union
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select * from cte where max_c < 100
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) select /*+ NO_DERIVED_CONDITION_PUSHDOWN(cte) */ * from cte;
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max_c avg_c
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107 107.0000
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500 234.6000
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315 279.3333
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with recursive cte as (
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select max_c, avg_c from v1,t2 where
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((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
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((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a))
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union
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select * from cte where max_c < 100
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) select * from cte;
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max_c avg_c
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107 107.0000
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500 234.6000
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315 279.3333
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explain format=json select /*+ NO_DERIVED_CONDITION_PUSHDOWN(dt)*/ * from
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(select t3.b as a from t3 group by t3.a) dt where (dt.a=3 or dt.a=5);
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EXPLAIN
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{
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"query_block": {
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"select_id": 1,
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"cost": "COST_REPLACED",
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"nested_loop": [
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{
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"table": {
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"table_name": "<derived2>",
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"access_type": "ALL",
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"loops": 1,
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"rows": 1001,
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"cost": "COST_REPLACED",
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"filtered": 100,
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"attached_condition": "dt.a = 3 or dt.a = 5",
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"materialized": {
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"query_block": {
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"select_id": 2,
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"cost": "COST_REPLACED",
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"filesort": {
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"sort_key": "t3.a",
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"temporary_table": {
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"nested_loop": [
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{
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"table": {
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"table_name": "t3",
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"access_type": "ALL",
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"loops": 1,
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"rows": 1001,
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"cost": "COST_REPLACED",
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"filtered": 100
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}
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}
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]
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}
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}
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}
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}
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}
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}
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]
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}
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}
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select /*+ NO_DERIVED_CONDITION_PUSHDOWN(dt)*/ * from
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(select t3.b as a from t3 group by t3.a) dt where (dt.a=3 or dt.a=5);
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a
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3
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5
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select * from
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(select t3.b as a from t3 group by t3.a) dt where (dt.a=3 or dt.a=5);
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a
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3
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5
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"This explain and query shows the result when no hints are specified, for comparison to hint cases in the next three explain and select pairs"
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explain format=json select * from (
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select t3.b as a from t3 group by t3.a
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) dt join (
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select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
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) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
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EXPLAIN
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{
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"query_block": {
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"select_id": 1,
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"cost": "COST_REPLACED",
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"nested_loop": [
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|
{
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|
"table": {
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"table_name": "<derived2>",
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|
"access_type": "ALL",
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|
"loops": 1,
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|
"rows": 1001,
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"cost": "COST_REPLACED",
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|
"filtered": 100,
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"attached_condition": "dt.a = 3 or dt.a = 5",
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"materialized": {
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"query_block": {
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"select_id": 2,
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"cost": "COST_REPLACED",
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"having_condition": "a = 3 or a = 5",
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"filesort": {
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"sort_key": "t3.a",
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"temporary_table": {
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|
"nested_loop": [
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|
{
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|
"table": {
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|
"table_name": "t3",
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|
"access_type": "ALL",
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|
"loops": 1,
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|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
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}
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}
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]
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}
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}
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}
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}
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}
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},
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|
{
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"block-nl-join": {
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|
"table": {
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"table_name": "<derived3>",
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|
"access_type": "ALL",
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|
"loops": 1001,
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|
"rows": 1001,
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|
"cost": "COST_REPLACED",
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|
"filtered": 100,
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"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0"
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},
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"buffer_type": "flat",
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|
"buffer_size": "8Kb",
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|
"join_type": "BNL",
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|
"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0",
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|
"materialized": {
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|
"query_block": {
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|
"select_id": 3,
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|
"cost": "COST_REPLACED",
|
|
"having_condition": "t3.a MOD 10 <> 0 or t3.a MOD 5 <> 0",
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|
"filesort": {
|
|
"sort_key": "t3.b",
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|
"temporary_table": {
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|
"nested_loop": [
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|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t3.a MOD 2 = 0"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
select count(*) from (
|
|
select t3.b as a from t3 group by t3.a
|
|
) dt join (
|
|
select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
|
|
) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
|
|
count(*)
|
|
1600
|
|
explain format=json select /*+ NO_DERIVED_CONDITION_PUSHDOWN(dt)*/ * from (
|
|
select t3.b as a from t3 group by t3.a
|
|
) dt join (
|
|
select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
|
|
) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived2>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dt.a = 3 or dt.a = 5",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"cost": "COST_REPLACED",
|
|
"filesort": {
|
|
"sort_key": "t3.a",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
},
|
|
{
|
|
"block-nl-join": {
|
|
"table": {
|
|
"table_name": "<derived3>",
|
|
"access_type": "ALL",
|
|
"loops": 1001,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0"
|
|
},
|
|
"buffer_type": "flat",
|
|
"buffer_size": "8Kb",
|
|
"join_type": "BNL",
|
|
"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 3,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "t3.a MOD 10 <> 0 or t3.a MOD 5 <> 0",
|
|
"filesort": {
|
|
"sort_key": "t3.b",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t3.a MOD 2 = 0"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
select /*+ NO_DERIVED_CONDITION_PUSHDOWN(dt)*/ count(*) from (
|
|
select t3.b as a from t3 group by t3.a
|
|
) dt join (
|
|
select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
|
|
) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
|
|
count(*)
|
|
1600
|
|
explain format=json select /*+ NO_DERIVED_CONDITION_PUSHDOWN(du)*/ * from (
|
|
select t3.b as a from t3 group by t3.a
|
|
) dt join (
|
|
select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
|
|
) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived2>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dt.a = 3 or dt.a = 5",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "a = 3 or a = 5",
|
|
"filesort": {
|
|
"sort_key": "t3.a",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
},
|
|
{
|
|
"block-nl-join": {
|
|
"table": {
|
|
"table_name": "<derived3>",
|
|
"access_type": "ALL",
|
|
"loops": 1001,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0"
|
|
},
|
|
"buffer_type": "flat",
|
|
"buffer_size": "8Kb",
|
|
"join_type": "BNL",
|
|
"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 3,
|
|
"cost": "COST_REPLACED",
|
|
"filesort": {
|
|
"sort_key": "t3.b",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t3.a MOD 2 = 0"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
select /*+ NO_DERIVED_CONDITION_PUSHDOWN(du)*/ count(*) from (
|
|
select t3.b as a from t3 group by t3.a
|
|
) dt join (
|
|
select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
|
|
) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
|
|
count(*)
|
|
1600
|
|
explain format=json select /*+ NO_DERIVED_CONDITION_PUSHDOWN(dt,du)*/ * from (
|
|
select t3.b as a from t3 group by t3.a
|
|
) dt join (
|
|
select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
|
|
) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived2>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dt.a = 3 or dt.a = 5",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"cost": "COST_REPLACED",
|
|
"filesort": {
|
|
"sort_key": "t3.a",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
},
|
|
{
|
|
"block-nl-join": {
|
|
"table": {
|
|
"table_name": "<derived3>",
|
|
"access_type": "ALL",
|
|
"loops": 1001,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0"
|
|
},
|
|
"buffer_type": "flat",
|
|
"buffer_size": "8Kb",
|
|
"join_type": "BNL",
|
|
"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 3,
|
|
"cost": "COST_REPLACED",
|
|
"filesort": {
|
|
"sort_key": "t3.b",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t3.a MOD 2 = 0"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
select /*+ NO_DERIVED_CONDITION_PUSHDOWN(dt,du)*/ count(*) from (
|
|
select t3.b as a from t3 group by t3.a
|
|
) dt join (
|
|
select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
|
|
) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
|
|
count(*)
|
|
1600
|
|
explain format=json SELECT /*+ NO_DERIVED_CONDITION_PUSHDOWN(dt) */ * FROM (
|
|
SELECT t4.b AS a
|
|
FROM t4
|
|
GROUP BY t4.a
|
|
) dt WHERE (dt.a=2);
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived2>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 3,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dt.a = 2",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"cost": "COST_REPLACED",
|
|
"filesort": {
|
|
"sort_key": "t4.a",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t4",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 3,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
SELECT /*+ NO_DERIVED_CONDITION_PUSHDOWN(dt) */ * FROM (
|
|
SELECT t4.b AS a
|
|
FROM t4
|
|
GROUP BY t4.a
|
|
) dt WHERE (dt.a=2);
|
|
a
|
|
2
|
|
SELECT * FROM (
|
|
SELECT t4.b AS a
|
|
FROM t4
|
|
GROUP BY t4.a
|
|
) dt WHERE (dt.a=2);
|
|
a
|
|
2
|
|
explain format=json SELECT /*+ NO_DERIVED_CONDITION_PUSHDOWN(dt) */ * FROM (
|
|
SELECT qb.b AS a
|
|
FROM (
|
|
select 1*t4.b as b, 1*t4.a as a from t4
|
|
) qb
|
|
GROUP BY qb.a
|
|
) dt WHERE (dt.a=2);
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived2>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 3,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dt.a = 2",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"cost": "COST_REPLACED",
|
|
"filesort": {
|
|
"sort_key": "1 * t4.a",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t4",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 3,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
SELECT /*+ NO_DERIVED_CONDITION_PUSHDOWN(dt) */ * FROM (
|
|
SELECT qb.b AS a
|
|
FROM (
|
|
select 1*t4.b as b, 1*t4.a as a from t4
|
|
) qb
|
|
GROUP BY qb.a
|
|
) dt WHERE (dt.a=2);
|
|
a
|
|
2
|
|
SELECT * FROM (
|
|
SELECT qb.b AS a
|
|
FROM (
|
|
select 1*t4.b as b, 1*t4.a as a from t4
|
|
) qb
|
|
GROUP BY qb.a
|
|
) dt WHERE (dt.a=2);
|
|
a
|
|
2
|
|
explain format=json
|
|
select /*+ NO_DERIVED_CONDITION_PUSHDOWN(@qb1 dv6) */ * from
|
|
(select /*+ QB_NAME(qb4) */ * from
|
|
(select /*+ QB_NAME(qb3) */ * from
|
|
(select /*+ QB_NAME(qb2) */ * from
|
|
(select /*+ QB_NAME(qb1) */ avg_a from
|
|
(select avg(a) as avg_a from v6) dv6
|
|
) dv6) dv6) dv6) dv6 where avg_a <> 0;
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived6>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dv6.avg_a <> 0",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 6,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t6",
|
|
"access_type": "index",
|
|
"key": "PRIMARY",
|
|
"key_length": "4",
|
|
"used_key_parts": ["a"],
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t6.a MOD 2 = 1",
|
|
"using_index": true
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
explain format=json
|
|
select /*+ NO_DERIVED_CONDITION_PUSHDOWN(@qb2 dv6) */ * from
|
|
(select /*+ QB_NAME(qb4) */ * from
|
|
(select /*+ QB_NAME(qb3) */ * from
|
|
(select /*+ QB_NAME(qb2) */ * from
|
|
(select /*+ QB_NAME(qb1) */ avg_a from
|
|
(select avg(a) as avg_a from v6) dv6
|
|
) dv6) dv6) dv6) dv6 where avg_a <> 0;
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived6>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dv6.avg_a <> 0",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 6,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "avg_a <> 0",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t6",
|
|
"access_type": "index",
|
|
"key": "PRIMARY",
|
|
"key_length": "4",
|
|
"used_key_parts": ["a"],
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t6.a MOD 2 = 1",
|
|
"using_index": true
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
explain format=json
|
|
select /*+ NO_DERIVED_CONDITION_PUSHDOWN(@qb3 dv6) */ * from
|
|
(select /*+ QB_NAME(qb4) */ * from
|
|
(select /*+ QB_NAME(qb3) */ * from
|
|
(select /*+ QB_NAME(qb2) */ * from
|
|
(select /*+ QB_NAME(qb1) */ avg_a from
|
|
(select avg(a) as avg_a from v6) dv6
|
|
) dv6) dv6) dv6) dv6 where avg_a <> 0;
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived6>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dv6.avg_a <> 0",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 6,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "avg_a <> 0",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t6",
|
|
"access_type": "index",
|
|
"key": "PRIMARY",
|
|
"key_length": "4",
|
|
"used_key_parts": ["a"],
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t6.a MOD 2 = 1",
|
|
"using_index": true
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
explain format=json
|
|
select /*+ NO_DERIVED_CONDITION_PUSHDOWN(@qb4 dv6) */ * from
|
|
(select /*+ QB_NAME(qb4) */ * from
|
|
(select /*+ QB_NAME(qb3) */ * from
|
|
(select /*+ QB_NAME(qb2) */ * from
|
|
(select /*+ QB_NAME(qb1) */ avg_a from
|
|
(select avg(a) as avg_a from v6) dv6
|
|
) dv6) dv6) dv6) dv6 where avg_a <> 0;
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived6>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dv6.avg_a <> 0",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 6,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "avg_a <> 0",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t6",
|
|
"access_type": "index",
|
|
"key": "PRIMARY",
|
|
"key_length": "4",
|
|
"used_key_parts": ["a"],
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t6.a MOD 2 = 1",
|
|
"using_index": true
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
set session optimizer_switch='condition_pushdown_for_derived=off';
|
|
explain format=json select /*+ DERIVED_CONDITION_PUSHDOWN(v1) */ * from v1,t2 where
|
|
((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
|
|
((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a));
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t2",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 9,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
},
|
|
{
|
|
"block-nl-join": {
|
|
"table": {
|
|
"table_name": "<derived2>",
|
|
"access_type": "ALL",
|
|
"loops": 9,
|
|
"rows": 20,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "v1.max_c > 300 or v1.max_c < 135"
|
|
},
|
|
"buffer_type": "flat",
|
|
"buffer_size": "238",
|
|
"join_type": "BNL",
|
|
"attached_condition": "v1.b = t2.b and v1.max_c > 300 and v1.avg_c > t2.d or v1.a = t2.a and v1.max_c < 135 and v1.max_c < t2.c",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "max_c < 707 and (max_c > 300 or max_c < 135)",
|
|
"filesort": {
|
|
"sort_key": "t1.a, t1.b",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t1",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 20,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
select /*+ DERIVED_CONDITION_PUSHDOWN(v1) */ * from v1,t2 where
|
|
((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
|
|
((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a));
|
|
a b max_c avg_c a b c d
|
|
1 19 107 107.0000 1 21 909 12
|
|
1 19 107 107.0000 1 19 203 107
|
|
1 21 500 234.6000 1 21 909 12
|
|
6 20 315 279.3333 6 20 315 279
|
|
select * from v1,t2 where
|
|
((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
|
|
((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a));
|
|
a b max_c avg_c a b c d
|
|
1 19 107 107.0000 1 21 909 12
|
|
1 19 107 107.0000 1 19 203 107
|
|
1 21 500 234.6000 1 21 909 12
|
|
6 20 315 279.3333 6 20 315 279
|
|
explain format=json with cte as (
|
|
select /*+ QB_NAME(qb1) */ max_c, avg_c from v1,t2 where
|
|
((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
|
|
((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a)))
|
|
select /*+ DERIVED_CONDITION_PUSHDOWN(v1@qb1) */ * from cte;
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t2",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 9,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
},
|
|
{
|
|
"block-nl-join": {
|
|
"table": {
|
|
"table_name": "<derived3>",
|
|
"access_type": "ALL",
|
|
"loops": 9,
|
|
"rows": 20,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "v1.max_c > 300 or v1.max_c < 135"
|
|
},
|
|
"buffer_type": "flat",
|
|
"buffer_size": "238",
|
|
"join_type": "BNL",
|
|
"attached_condition": "v1.b = t2.b and v1.max_c > 300 and v1.avg_c > t2.d or v1.a = t2.a and v1.max_c < 135 and v1.max_c < t2.c",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 3,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "max_c < 707 and (max_c > 300 or max_c < 135)",
|
|
"filesort": {
|
|
"sort_key": "t1.a, t1.b",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t1",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 20,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
with cte as (
|
|
select /*+ QB_NAME(qb1) */ max_c, avg_c from v1,t2 where
|
|
((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
|
|
((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a)))
|
|
select /*+ DERIVED_CONDITION_PUSHDOWN(v1@qb1) */ * from cte;
|
|
max_c avg_c
|
|
107 107.0000
|
|
107 107.0000
|
|
500 234.6000
|
|
315 279.3333
|
|
with cte as (
|
|
select /*+ QB_NAME(qb1) */ max_c, avg_c from v1,t2 where
|
|
((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
|
|
((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a)))
|
|
select * from cte;
|
|
max_c avg_c
|
|
107 107.0000
|
|
107 107.0000
|
|
500 234.6000
|
|
315 279.3333
|
|
explain format=json with recursive cte as (
|
|
select /*+ QB_NAME(qb1) */ max_c, avg_c from v1,t2 where
|
|
((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
|
|
((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a))
|
|
union
|
|
select /*+ QB_NAME(qb2) */ * from cte where max_c < 100
|
|
) select /*+ DERIVED_CONDITION_PUSHDOWN(v1@qb1) DERIVED_CONDITION_PUSHDOWN(cte) */ * from cte;
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived2>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 180,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"materialized": {
|
|
"query_block": {
|
|
"recursive_union": {
|
|
"table_name": "<union2,3>",
|
|
"access_type": "ALL",
|
|
"query_specifications": [
|
|
{
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t2",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 9,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
},
|
|
{
|
|
"block-nl-join": {
|
|
"table": {
|
|
"table_name": "<derived4>",
|
|
"access_type": "ALL",
|
|
"loops": 9,
|
|
"rows": 20,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "v1.max_c > 300 or v1.max_c < 135"
|
|
},
|
|
"buffer_type": "flat",
|
|
"buffer_size": "238",
|
|
"join_type": "BNL",
|
|
"attached_condition": "v1.b = t2.b and v1.max_c > 300 and v1.avg_c > t2.d or v1.a = t2.a and v1.max_c < 135 and v1.max_c < t2.c",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 4,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "max_c < 707 and (max_c > 300 or max_c < 135)",
|
|
"filesort": {
|
|
"sort_key": "t1.a, t1.b",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t1",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 20,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
},
|
|
{
|
|
"query_block": {
|
|
"select_id": 3,
|
|
"operation": "UNION",
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived2>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 180,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "cte.max_c < 100"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
with recursive cte as (
|
|
select /*+ QB_NAME(qb1) */ max_c, avg_c from v1,t2 where
|
|
((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
|
|
((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a))
|
|
union
|
|
select /*+ QB_NAME(qb2) */ * from cte where max_c < 100
|
|
) select /*+ DERIVED_CONDITION_PUSHDOWN(v1@qb1) DERIVED_CONDITION_PUSHDOWN(cte) */ * from cte;
|
|
max_c avg_c
|
|
107 107.0000
|
|
500 234.6000
|
|
315 279.3333
|
|
with recursive cte as (
|
|
select max_c, avg_c from v1,t2 where
|
|
((v1.max_c>300) and (v1.avg_c>t2.d) and (v1.b=t2.b)) or
|
|
((v1.max_c<135) and (v1.max_c<t2.c) and (v1.a=t2.a))
|
|
union
|
|
select * from cte where max_c < 100
|
|
) select * from cte;
|
|
max_c avg_c
|
|
107 107.0000
|
|
500 234.6000
|
|
315 279.3333
|
|
explain format=json select /*+ DERIVED_CONDITION_PUSHDOWN(dt)*/ * from
|
|
(select t3.b as a from t3 group by t3.a) dt where (dt.a=3 or dt.a=5);
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived2>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dt.a = 3 or dt.a = 5",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "a = 3 or a = 5",
|
|
"filesort": {
|
|
"sort_key": "t3.a",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
select /*+ DERIVED_CONDITION_PUSHDOWN(dt)*/ * from
|
|
(select t3.b as a from t3 group by t3.a) dt where (dt.a=3 or dt.a=5);
|
|
a
|
|
3
|
|
5
|
|
select * from
|
|
(select t3.b as a from t3 group by t3.a) dt where (dt.a=3 or dt.a=5);
|
|
a
|
|
3
|
|
5
|
|
explain format=json SELECT /*+ DERIVED_CONDITION_PUSHDOWN(dt) */ * FROM (
|
|
SELECT t4.b AS a
|
|
FROM t4
|
|
GROUP BY t4.a
|
|
) dt WHERE (dt.a=2);
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived2>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 3,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dt.a = 2",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "a = 2",
|
|
"filesort": {
|
|
"sort_key": "t4.a",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t4",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 3,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
SELECT /*+ DERIVED_CONDITION_PUSHDOWN(dt) */ * FROM (
|
|
SELECT t4.b AS a
|
|
FROM t4
|
|
GROUP BY t4.a
|
|
) dt WHERE (dt.a=2);
|
|
a
|
|
2
|
|
SELECT * FROM (
|
|
SELECT t4.b AS a
|
|
FROM t4
|
|
GROUP BY t4.a
|
|
) dt WHERE (dt.a=2);
|
|
a
|
|
2
|
|
explain format=json SELECT /*+ DERIVED_CONDITION_PUSHDOWN(dt) */ * FROM (
|
|
SELECT qb.b AS a
|
|
FROM (
|
|
select 1*t4.b as b, 1*t4.a as a from t4
|
|
) qb
|
|
GROUP BY qb.a
|
|
) dt WHERE (dt.a=2);
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived2>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 3,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dt.a = 2",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "b = 2",
|
|
"filesort": {
|
|
"sort_key": "1 * t4.a",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t4",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 3,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
SELECT /*+ DERIVED_CONDITION_PUSHDOWN(dt) */ * FROM (
|
|
SELECT qb.b AS a
|
|
FROM (
|
|
select 1*t4.b as b, 1*t4.a as a from t4
|
|
) qb
|
|
GROUP BY qb.a
|
|
) dt WHERE (dt.a=2);
|
|
a
|
|
2
|
|
SELECT * FROM (
|
|
SELECT qb.b AS a
|
|
FROM (
|
|
select 1*t4.b as b, 1*t4.a as a from t4
|
|
) qb
|
|
GROUP BY qb.a
|
|
) dt WHERE (dt.a=2);
|
|
a
|
|
2
|
|
"This explain and query shows the result when no hints are specified, for comparison to hint cases in the next three explain and select pairs"
|
|
explain format=json select * from (
|
|
select t3.b as a from t3 group by t3.a
|
|
) dt join (
|
|
select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
|
|
) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived2>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dt.a = 3 or dt.a = 5",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"cost": "COST_REPLACED",
|
|
"filesort": {
|
|
"sort_key": "t3.a",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
},
|
|
{
|
|
"block-nl-join": {
|
|
"table": {
|
|
"table_name": "<derived3>",
|
|
"access_type": "ALL",
|
|
"loops": 1001,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0"
|
|
},
|
|
"buffer_type": "flat",
|
|
"buffer_size": "8Kb",
|
|
"join_type": "BNL",
|
|
"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 3,
|
|
"cost": "COST_REPLACED",
|
|
"filesort": {
|
|
"sort_key": "t3.b",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t3.a MOD 2 = 0"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
select count(*) from (
|
|
select t3.b as a from t3 group by t3.a
|
|
) dt join (
|
|
select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
|
|
) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
|
|
count(*)
|
|
1600
|
|
explain format=json select /*+ DERIVED_CONDITION_PUSHDOWN(dt)*/ * from (
|
|
select t3.b as a from t3 group by t3.a
|
|
) dt join (
|
|
select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
|
|
) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived2>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dt.a = 3 or dt.a = 5",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "a = 3 or a = 5",
|
|
"filesort": {
|
|
"sort_key": "t3.a",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
},
|
|
{
|
|
"block-nl-join": {
|
|
"table": {
|
|
"table_name": "<derived3>",
|
|
"access_type": "ALL",
|
|
"loops": 1001,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0"
|
|
},
|
|
"buffer_type": "flat",
|
|
"buffer_size": "8Kb",
|
|
"join_type": "BNL",
|
|
"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 3,
|
|
"cost": "COST_REPLACED",
|
|
"filesort": {
|
|
"sort_key": "t3.b",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t3.a MOD 2 = 0"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
select /*+ DERIVED_CONDITION_PUSHDOWN(dt)*/ count(*) from (
|
|
select t3.b as a from t3 group by t3.a
|
|
) dt join (
|
|
select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
|
|
) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
|
|
count(*)
|
|
1600
|
|
explain format=json select /*+ DERIVED_CONDITION_PUSHDOWN(du)*/ * from (
|
|
select t3.b as a from t3 group by t3.a
|
|
) dt join (
|
|
select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
|
|
) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived2>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dt.a = 3 or dt.a = 5",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"cost": "COST_REPLACED",
|
|
"filesort": {
|
|
"sort_key": "t3.a",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
},
|
|
{
|
|
"block-nl-join": {
|
|
"table": {
|
|
"table_name": "<derived3>",
|
|
"access_type": "ALL",
|
|
"loops": 1001,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0"
|
|
},
|
|
"buffer_type": "flat",
|
|
"buffer_size": "8Kb",
|
|
"join_type": "BNL",
|
|
"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 3,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "t3.a MOD 10 <> 0 or t3.a MOD 5 <> 0",
|
|
"filesort": {
|
|
"sort_key": "t3.b",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t3.a MOD 2 = 0"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
select /*+ DERIVED_CONDITION_PUSHDOWN(du)*/ count(*) from (
|
|
select t3.b as a from t3 group by t3.a
|
|
) dt join (
|
|
select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
|
|
) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
|
|
count(*)
|
|
1600
|
|
explain format=json select /*+ DERIVED_CONDITION_PUSHDOWN(dt,du)*/ * from (
|
|
select t3.b as a from t3 group by t3.a
|
|
) dt join (
|
|
select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
|
|
) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived2>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dt.a = 3 or dt.a = 5",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "a = 3 or a = 5",
|
|
"filesort": {
|
|
"sort_key": "t3.a",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
},
|
|
{
|
|
"block-nl-join": {
|
|
"table": {
|
|
"table_name": "<derived3>",
|
|
"access_type": "ALL",
|
|
"loops": 1001,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0"
|
|
},
|
|
"buffer_type": "flat",
|
|
"buffer_size": "8Kb",
|
|
"join_type": "BNL",
|
|
"attached_condition": "du.a MOD 10 <> 0 or du.a MOD 5 <> 0",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 3,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "t3.a MOD 10 <> 0 or t3.a MOD 5 <> 0",
|
|
"filesort": {
|
|
"sort_key": "t3.b",
|
|
"temporary_table": {
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 1001,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t3.a MOD 2 = 0"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
select /*+ DERIVED_CONDITION_PUSHDOWN(dt,du)*/ count(*) from (
|
|
select t3.b as a from t3 group by t3.a
|
|
) dt join (
|
|
select t3.a as a, t3.b as b from t3 where t3.a % 2 = 0 group by t3.b
|
|
) du where (dt.a=3 or dt.a=5) and (du.a % 10 <> 0 or du.a % 5 <> 0);
|
|
count(*)
|
|
1600
|
|
explain format=json
|
|
select /*+ DERIVED_CONDITION_PUSHDOWN(@qb1 dv6) */ * from
|
|
(select /*+ QB_NAME(qb4) */ * from
|
|
(select /*+ QB_NAME(qb3) */ * from
|
|
(select /*+ QB_NAME(qb2) */ * from
|
|
(select /*+ QB_NAME(qb1) */ avg_a from
|
|
(select avg(a) as avg_a from v6) dv6
|
|
) dv6) dv6) dv6) dv6 where avg_a <> 0;
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived6>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dv6.avg_a <> 0",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 6,
|
|
"cost": "COST_REPLACED",
|
|
"having_condition": "avg_a <> 0",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t6",
|
|
"access_type": "index",
|
|
"key": "PRIMARY",
|
|
"key_length": "4",
|
|
"used_key_parts": ["a"],
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t6.a MOD 2 = 1",
|
|
"using_index": true
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
explain format=json
|
|
select /*+ DERIVED_CONDITION_PUSHDOWN(@qb2 dv6) */ * from
|
|
(select /*+ QB_NAME(qb4) */ * from
|
|
(select /*+ QB_NAME(qb3) */ * from
|
|
(select /*+ QB_NAME(qb2) */ * from
|
|
(select /*+ QB_NAME(qb1) */ avg_a from
|
|
(select avg(a) as avg_a from v6) dv6
|
|
) dv6) dv6) dv6) dv6 where avg_a <> 0;
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived6>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dv6.avg_a <> 0",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 6,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t6",
|
|
"access_type": "index",
|
|
"key": "PRIMARY",
|
|
"key_length": "4",
|
|
"used_key_parts": ["a"],
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t6.a MOD 2 = 1",
|
|
"using_index": true
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
explain format=json
|
|
select /*+ DERIVED_CONDITION_PUSHDOWN(@qb3 dv6) */ * from
|
|
(select /*+ QB_NAME(qb4) */ * from
|
|
(select /*+ QB_NAME(qb3) */ * from
|
|
(select /*+ QB_NAME(qb2) */ * from
|
|
(select /*+ QB_NAME(qb1) */ avg_a from
|
|
(select avg(a) as avg_a from v6) dv6
|
|
) dv6) dv6) dv6) dv6 where avg_a <> 0;
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived6>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dv6.avg_a <> 0",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 6,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t6",
|
|
"access_type": "index",
|
|
"key": "PRIMARY",
|
|
"key_length": "4",
|
|
"used_key_parts": ["a"],
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t6.a MOD 2 = 1",
|
|
"using_index": true
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
explain format=json
|
|
select /*+ DERIVED_CONDITION_PUSHDOWN(@qb4 dv6) */ * from
|
|
(select /*+ QB_NAME(qb4) */ * from
|
|
(select /*+ QB_NAME(qb3) */ * from
|
|
(select /*+ QB_NAME(qb2) */ * from
|
|
(select /*+ QB_NAME(qb1) */ avg_a from
|
|
(select avg(a) as avg_a from v6) dv6
|
|
) dv6) dv6) dv6) dv6 where avg_a <> 0;
|
|
EXPLAIN
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "<derived6>",
|
|
"access_type": "ALL",
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "dv6.avg_a <> 0",
|
|
"materialized": {
|
|
"query_block": {
|
|
"select_id": 6,
|
|
"cost": "COST_REPLACED",
|
|
"nested_loop": [
|
|
{
|
|
"table": {
|
|
"table_name": "t6",
|
|
"access_type": "index",
|
|
"key": "PRIMARY",
|
|
"key_length": "4",
|
|
"used_key_parts": ["a"],
|
|
"loops": 1,
|
|
"rows": 50,
|
|
"cost": "COST_REPLACED",
|
|
"filtered": 100,
|
|
"attached_condition": "t6.a MOD 2 = 1",
|
|
"using_index": true
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
set optimizer_switch=@save_optimizer_switch;
|
|
create table t7(a int);
|
|
insert into t7 values (1),(2),(3);
|
|
explain extended select /*+ NO_MERGE(t) NO_ICP(t key1) */ * from (select * from t7) t;
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3 100.00
|
|
2 DERIVED t7 ALL NULL NULL NULL NULL 3 100.00
|
|
Warnings:
|
|
Warning 4222 Unresolved index name `t`@`select#1` `key1` for NO_ICP hint
|
|
Note 1003 /* select#1 */ select /*+ NO_MERGE(`t`@`select#1`) */ `t`.`a` AS `a` from (/* select#2 */ select `test`.`t7`.`a` AS `a` from `test`.`t7`) `t`
|
|
explain extended select /*+ NO_MERGE(t) NO_ICP(t) */ * from (select * from t7) t;
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3 100.00
|
|
2 DERIVED t7 ALL NULL NULL NULL NULL 3 100.00
|
|
Warnings:
|
|
Note 1003 /* select#1 */ select /*+ NO_ICP(`t`@`select#1`) NO_MERGE(`t`@`select#1`) */ `t`.`a` AS `a` from (/* select#2 */ select `test`.`t7`.`a` AS `a` from `test`.`t7`) `t`
|
|
drop view v1, v2, v6;
|
|
drop table t1, t2, t3, t4, t5, t6, t7;
|