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2cfc450bf7
"Re-factor the code for post-join operations". The patch mainly contains the code ported from mysql-5.6 and created for two essential architectural changes: 1. WL#5558: Resolve ORDER BY execution method at the optimization stage 2. WL#6071: Inline tmp tables into the nested loops algorithm The first task was implemented for mysql-5.6 by Ole John Aske. It allows to make all decisions on ORDER BY operation at the optimization stage. The second task implemented for mysql-5.6 by Evgeny Potemkin adds JOIN_TAB nodes for post-join operations that require temporary tables. It allows to execute these operations within the nested loops algorithm that used to be used before this task only for join queries. Besides these task moves all planning on the execution of these operations from the execution phase to the optimization phase. Some other re-factoring changes of mysql-5.6 were pulled in, mainly because it was easier to pull them in than roll them back. In particular all changes concerning Ref_ptr_array were incorporated. The port required some changes in the MariaDB code that concerned the functionality of EXPLAIN and ANALYZE. This was done mainly by Sergey Petrunia.
765 lines
19 KiB
Text
765 lines
19 KiB
Text
drop table if exists t0,t1,t2,t3;
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create table t0 (a int);
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INSERT INTO t0 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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# r_filtered=30%, because 3 rows match: 0,1,2
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analyze format=json select * from t0 where a<3;
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ANALYZE
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{
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"query_block": {
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"select_id": 1,
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"r_loops": 1,
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"r_total_time_ms": "REPLACED",
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"table": {
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"table_name": "t0",
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"access_type": "ALL",
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"r_loops": 1,
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"rows": 10,
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"r_rows": 10,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 30,
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"attached_condition": "(t0.a < 3)"
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}
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}
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}
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create table t1 (a int, b int, c int, key(a));
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insert into t1 select A.a*10 + B.a, A.a*10 + B.a, A.a*10 + B.a from t0 A, t0 B;
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analyze
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select * from t0, t1 where t1.a=t0.a and t0.a > 9;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t0 ALL NULL NULL NULL NULL 10 10.00 100.00 0.00 Using where
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1 SIMPLE t1 ref a a 5 test.t0.a 1 NULL 100.00 NULL
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analyze format=json
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select * from t0, t1 where t1.a=t0.a and t0.a > 9;
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ANALYZE
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{
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"query_block": {
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"select_id": 1,
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"r_loops": 1,
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"r_total_time_ms": "REPLACED",
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"table": {
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"table_name": "t0",
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"access_type": "ALL",
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"r_loops": 1,
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"rows": 10,
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"r_rows": 10,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 0,
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"attached_condition": "((t0.a > 9) and (t0.a is not null))"
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},
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"table": {
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"table_name": "t1",
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"access_type": "ref",
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"possible_keys": ["a"],
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"key": "a",
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"key_length": "5",
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"used_key_parts": ["a"],
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"ref": ["test.t0.a"],
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"r_loops": 0,
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"rows": 1,
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"r_rows": null,
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"filtered": 100,
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"r_filtered": null
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}
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}
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}
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analyze
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select * from t0, t1 where t1.a=t0.a and t1.b<4;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE t0 ALL NULL NULL NULL NULL 10 10.00 100.00 100.00 Using where
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1 SIMPLE t1 ref a a 5 test.t0.a 1 1.00 100.00 40.00 Using where
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analyze format=json
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select * from t0, t1 where t1.a=t0.a and t1.b<4;
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ANALYZE
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{
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"query_block": {
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"select_id": 1,
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"r_loops": 1,
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"r_total_time_ms": "REPLACED",
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"table": {
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"table_name": "t0",
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"access_type": "ALL",
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"r_loops": 1,
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"rows": 10,
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"r_rows": 10,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 100,
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"attached_condition": "(t0.a is not null)"
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},
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"table": {
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"table_name": "t1",
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"access_type": "ref",
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"possible_keys": ["a"],
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"key": "a",
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"key_length": "5",
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"used_key_parts": ["a"],
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"ref": ["test.t0.a"],
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"r_loops": 10,
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"rows": 1,
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"r_rows": 1,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 40,
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"attached_condition": "(t1.b < 4)"
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}
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}
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}
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analyze
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select * from t1 tbl1, t1 tbl2 where tbl1.b<2 and tbl2.b>5;
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id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
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1 SIMPLE tbl1 ALL NULL NULL NULL NULL 100 100.00 100.00 2.00 Using where
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1 SIMPLE tbl2 ALL NULL NULL NULL NULL 100 100.00 100.00 94.00 Using where; Using join buffer (flat, BNL join)
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analyze format=json
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select * from t1 tbl1, t1 tbl2 where tbl1.b<20 and tbl2.b<60;
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ANALYZE
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{
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"query_block": {
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"select_id": 1,
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"r_loops": 1,
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"r_total_time_ms": "REPLACED",
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"table": {
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"table_name": "tbl1",
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"access_type": "ALL",
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"r_loops": 1,
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"rows": 100,
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"r_rows": 100,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 20,
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"attached_condition": "(tbl1.b < 20)"
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},
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"block-nl-join": {
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"table": {
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"table_name": "tbl2",
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"access_type": "ALL",
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"r_loops": 1,
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"rows": 100,
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"r_rows": 100,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 60,
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"attached_condition": "(tbl2.b < 60)"
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},
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"buffer_type": "flat",
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"buffer_size": "256Kb",
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"join_type": "BNL",
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"r_filtered": 100
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}
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}
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}
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analyze format=json
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select * from t1 tbl1, t1 tbl2 where tbl1.b<20 and tbl2.b<60 and tbl1.c > tbl2.c;
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ANALYZE
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{
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"query_block": {
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"select_id": 1,
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"r_loops": 1,
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"r_total_time_ms": "REPLACED",
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"table": {
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"table_name": "tbl1",
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"access_type": "ALL",
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"r_loops": 1,
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"rows": 100,
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"r_rows": 100,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 20,
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"attached_condition": "(tbl1.b < 20)"
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},
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"block-nl-join": {
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"table": {
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"table_name": "tbl2",
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"access_type": "ALL",
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"r_loops": 1,
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"rows": 100,
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"r_rows": 100,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 60,
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"attached_condition": "(tbl2.b < 60)"
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},
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"buffer_type": "flat",
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"buffer_size": "256Kb",
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"join_type": "BNL",
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"attached_condition": "(tbl1.c > tbl2.c)",
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"r_filtered": 15.833
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}
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}
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}
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drop table t1;
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drop table t0;
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#
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# MDEV-7674: ANALYZE shows r_rows=0
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#
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create table t1(a int);
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insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t2 (a int, key(a));
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insert into t2 values (0),(1);
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analyze format=json select * from t1 straight_join t2 force index(a) where t2.a=t1.a;
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ANALYZE
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{
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"query_block": {
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"select_id": 1,
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"r_loops": 1,
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"r_total_time_ms": "REPLACED",
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"table": {
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"table_name": "t1",
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"access_type": "ALL",
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"r_loops": 1,
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"rows": 10,
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"r_rows": 10,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 100,
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"attached_condition": "(t1.a is not null)"
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},
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"table": {
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"table_name": "t2",
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"access_type": "ref",
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"possible_keys": ["a"],
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"key": "a",
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"key_length": "5",
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"used_key_parts": ["a"],
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"ref": ["test.t1.a"],
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"r_loops": 10,
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"rows": 2,
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"r_rows": 0.2,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 100,
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"using_index": true
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}
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}
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}
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drop table t1,t2;
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create table t1(a int);
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insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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#
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# MDEV-7679: ANALYZE crashes when printing WHERE when no default db
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#
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select database();
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database()
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test
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select database();
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database()
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NULL
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analyze format=json select * from test.t1 where t1.a<5;
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ANALYZE
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{
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"query_block": {
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"select_id": 1,
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"r_loops": 1,
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"r_total_time_ms": "REPLACED",
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"table": {
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"table_name": "t1",
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"access_type": "ALL",
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"r_loops": 1,
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"rows": 10,
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"r_rows": 10,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 50,
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"attached_condition": "(test.t1.a < 5)"
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}
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}
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}
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drop table t1;
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#
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# MDEV-7812: ANALYZE FORMAT=JSON UPDATE/DELETE doesnt print
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# the r_total_time_ms
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#
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create table t2(a int);
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insert into t2 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t3(a int);
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insert into t3 select A.a + B.a* 10 + C.a * 100 from t2 A, t2 B, t2 C;
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create table t1 (pk int primary key);
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insert into t1 select a from t3;
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alter table t1 add b int;
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analyze format=json
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update t1 set b=pk;
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ANALYZE
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{
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"query_block": {
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"select_id": 1,
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"r_total_time_ms": "REPLACED",
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"table": {
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"update": 1,
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"table_name": "t1",
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"access_type": "ALL",
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"rows": 1000,
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"r_rows": 1000,
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"r_filtered": 100,
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"r_total_time_ms": "REPLACED"
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}
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}
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}
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analyze format=json
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select * from t1 where pk < 10 and b > 4;
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ANALYZE
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{
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"query_block": {
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"select_id": 1,
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"r_loops": 1,
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"r_total_time_ms": "REPLACED",
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"table": {
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"table_name": "t1",
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"access_type": "range",
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"possible_keys": ["PRIMARY"],
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"key": "PRIMARY",
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"key_length": "4",
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"used_key_parts": ["pk"],
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"r_loops": 1,
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"rows": 11,
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"r_rows": 10,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 50,
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"index_condition": "(t1.pk < 10)",
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"attached_condition": "(t1.b > 4)"
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}
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}
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}
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analyze format=json
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delete from t1 where pk < 10 and b > 4;
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ANALYZE
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{
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"query_block": {
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"select_id": 1,
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"r_total_time_ms": "REPLACED",
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"table": {
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"delete": 1,
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"table_name": "t1",
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"access_type": "range",
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"possible_keys": ["PRIMARY"],
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"key": "PRIMARY",
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"key_length": "4",
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"used_key_parts": ["pk"],
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"rows": 11,
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"r_rows": 10,
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"r_filtered": 50,
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"r_total_time_ms": "REPLACED",
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"attached_condition": "((t1.pk < 10) and (t1.b > 4))"
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}
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}
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}
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drop table t1, t3, t2;
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#
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# MDEV-7833:ANALYZE FORMAT=JSON and Range checked for each record
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#
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create table t3(a int);
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insert into t3 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t4(a int);
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insert into t4 select A.a + B.a* 10 + C.a * 100 from t3 A, t3 B, t3 C;
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create table t1 (lb1 int, rb1 int, lb2 int, rb2 int, c1 int, c2 int);
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insert into t1 values (1,2,10,20,15,15);
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insert into t1 values (3,5,10,20,15,15);
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insert into t1 values (10,20,10,20,15,15);
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insert into t1 values (10,20,1,2,15,15);
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insert into t1 values (10,20,10,20,1,3);
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create table t2 (key1 int, key2 int, key3 int, key4 int, col1 int,
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key(key1), key(key2), key(key3), key(key4));
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insert into t2 select a,a,a,a,a from t3;
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insert into t2 select 15,15,15,15,15 from t4;
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analyze format=json
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select * from t1, t2 where (t2.key1 between t1.lb1 and t1.rb1) and
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(t2.key2 between t1.lb2 and t1.rb2) and
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(t2.key3=t1.c1 OR t2.key4=t1.c2);
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ANALYZE
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{
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"query_block": {
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"select_id": 1,
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"r_loops": 1,
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"r_total_time_ms": "REPLACED",
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"table": {
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"table_name": "t1",
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"access_type": "ALL",
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"r_loops": 1,
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"rows": 5,
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"r_rows": 5,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 100
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},
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"range-checked-for-each-record": {
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"keys": ["key1", "key2", "key3", "key4"],
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"r_keys": {
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"full_scan": 1,
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"index_merge": 1,
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"range": {
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"key1": 2,
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"key2": 1,
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"key3": 0,
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"key4": 0
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}
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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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"possible_keys": ["key1", "key2", "key3", "key4"],
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"r_loops": 5,
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"rows": 1010,
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"r_rows": 203.8,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 98.135
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}
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}
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}
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}
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drop table t1,t2,t3,t4;
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#
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# MDEV-7904: ANALYZE FORMAT=JSON SELECT .. UNION SELECT doesn't print r_rows for union output
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#
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create table t0 (a int);
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INSERT INTO t0 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t1 (a int);
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INSERT INTO t1 select * from t0;
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analyze format=json (select * from t1 tbl1 where a<5) union (select * from t1 tbl2 where a in (2,3));
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ANALYZE
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{
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"query_block": {
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"union_result": {
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"table_name": "<union1,2>",
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"access_type": "ALL",
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"r_loops": 1,
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"r_rows": 5,
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"query_specifications": [
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{
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"query_block": {
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"select_id": 1,
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"r_loops": 1,
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"r_total_time_ms": "REPLACED",
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"table": {
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"table_name": "tbl1",
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"access_type": "ALL",
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"r_loops": 1,
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"rows": 10,
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"r_rows": 10,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 50,
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"attached_condition": "(tbl1.a < 5)"
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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": 2,
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"r_loops": 1,
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"r_total_time_ms": "REPLACED",
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"table": {
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"table_name": "tbl2",
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"access_type": "ALL",
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"r_loops": 1,
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"rows": 10,
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"r_rows": 10,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 20,
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"attached_condition": "(tbl2.a in (2,3))"
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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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drop table t0, t1;
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#
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# MDEV-7970: EXPLAIN FORMAT=JSON does not print HAVING
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#
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create table t0(a int);
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insert into t0 values (0),(1),(2),(3);
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create table t1(a int);
|
|
insert into t1 select A.a + B.a* 10 + C.a * 100 from t0 A, t0 B, t0 C;
|
|
create table t2 (
|
|
a int,
|
|
b int,
|
|
key (a)
|
|
);
|
|
insert into t2 select A.a*1000 + B.a, A.a*1000 + B.a from t0 A, t1 B;
|
|
# normal HAVING
|
|
analyze format=json select a, max(b) as TOP from t2 group by a having TOP > a;
|
|
ANALYZE
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"r_loops": 1,
|
|
"volatile parameter": "REPLACED",
|
|
"having_condition": "(TOP > t2.a)",
|
|
"filesort": {
|
|
"r_loops": 1,
|
|
"volatile parameter": "REPLACED",
|
|
"r_used_priority_queue": false,
|
|
"r_output_rows": 0,
|
|
"volatile parameter": "REPLACED",
|
|
"temporary_table": {
|
|
"table": {
|
|
"table_name": "t2",
|
|
"access_type": "ALL",
|
|
"r_loops": 1,
|
|
"rows": 256,
|
|
"r_rows": 256,
|
|
"volatile parameter": "REPLACED",
|
|
"filtered": 100,
|
|
"r_filtered": 100
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
# HAVING is always TRUE (not printed)
|
|
analyze format=json select a, max(b) as TOP from t2 group by a having 1<>2;
|
|
ANALYZE
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"r_loops": 1,
|
|
"volatile parameter": "REPLACED",
|
|
"filesort": {
|
|
"r_loops": 1,
|
|
"volatile parameter": "REPLACED",
|
|
"r_used_priority_queue": false,
|
|
"r_output_rows": 256,
|
|
"volatile parameter": "REPLACED",
|
|
"temporary_table": {
|
|
"table": {
|
|
"table_name": "t2",
|
|
"access_type": "ALL",
|
|
"r_loops": 1,
|
|
"rows": 256,
|
|
"r_rows": 256,
|
|
"volatile parameter": "REPLACED",
|
|
"filtered": 100,
|
|
"r_filtered": 100
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
# HAVING is always FALSE (intercepted by message)
|
|
analyze format=json select a, max(b) as TOP from t2 group by a having 1=2;
|
|
ANALYZE
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"table": {
|
|
"message": "Impossible HAVING"
|
|
}
|
|
}
|
|
}
|
|
# HAVING is absent
|
|
analyze format=json select a, max(b) as TOP from t2 group by a;
|
|
ANALYZE
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"r_loops": 1,
|
|
"volatile parameter": "REPLACED",
|
|
"filesort": {
|
|
"r_loops": 1,
|
|
"volatile parameter": "REPLACED",
|
|
"r_used_priority_queue": false,
|
|
"r_output_rows": 256,
|
|
"volatile parameter": "REPLACED",
|
|
"temporary_table": {
|
|
"table": {
|
|
"table_name": "t2",
|
|
"access_type": "ALL",
|
|
"r_loops": 1,
|
|
"rows": 256,
|
|
"r_rows": 256,
|
|
"volatile parameter": "REPLACED",
|
|
"filtered": 100,
|
|
"r_filtered": 100
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
drop table t0, t1, t2;
|
|
#
|
|
# MDEV-7267: Server crashes in Item_field::print on ANALYZE FORMAT=JSON
|
|
#
|
|
CREATE TABLE t1 (a INT);
|
|
INSERT INTO t1 VALUES (1),(2);
|
|
CREATE TABLE t2 (b INT);
|
|
INSERT INTO t2 VALUES (3),(4);
|
|
ANALYZE FORMAT=JSON SELECT STRAIGHT_JOIN * FROM t1, t2 WHERE b IN ( SELECT a FROM t1 );
|
|
ANALYZE
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"r_loops": 1,
|
|
"volatile parameter": "REPLACED",
|
|
"table": {
|
|
"table_name": "t1",
|
|
"access_type": "ALL",
|
|
"r_loops": 1,
|
|
"rows": 2,
|
|
"r_rows": 2,
|
|
"volatile parameter": "REPLACED",
|
|
"filtered": 100,
|
|
"r_filtered": 100
|
|
},
|
|
"block-nl-join": {
|
|
"table": {
|
|
"table_name": "<subquery2>",
|
|
"access_type": "ALL",
|
|
"possible_keys": ["distinct_key"],
|
|
"r_loops": 1,
|
|
"rows": 2,
|
|
"r_rows": 2,
|
|
"volatile parameter": "REPLACED",
|
|
"filtered": 100,
|
|
"r_filtered": 100
|
|
},
|
|
"buffer_type": "flat",
|
|
"buffer_size": "256Kb",
|
|
"join_type": "BNL",
|
|
"r_filtered": 100,
|
|
"materialized": {
|
|
"unique": 1,
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"r_loops": 1,
|
|
"volatile parameter": "REPLACED",
|
|
"table": {
|
|
"table_name": "t1",
|
|
"access_type": "ALL",
|
|
"r_loops": 1,
|
|
"rows": 2,
|
|
"r_rows": 2,
|
|
"volatile parameter": "REPLACED",
|
|
"filtered": 100,
|
|
"r_filtered": 100
|
|
}
|
|
}
|
|
}
|
|
},
|
|
"block-nl-join": {
|
|
"table": {
|
|
"table_name": "t2",
|
|
"access_type": "ALL",
|
|
"r_loops": 1,
|
|
"rows": 2,
|
|
"r_rows": 2,
|
|
"volatile parameter": "REPLACED",
|
|
"filtered": 100,
|
|
"r_filtered": 100
|
|
},
|
|
"buffer_type": "incremental",
|
|
"buffer_size": "256Kb",
|
|
"join_type": "BNL",
|
|
"attached_condition": "(t2.b = `<subquery2>`.a)",
|
|
"r_filtered": 0
|
|
}
|
|
}
|
|
}
|
|
drop table t1,t2;
|
|
#
|
|
# MDEV-8864: Server crash #2 in Item_field::print on ANALYZE FORMAT=JSON
|
|
#
|
|
CREATE TABLE t1 (f1 INT) ENGINE=MyISAM;
|
|
INSERT INTO t1 VALUES (1),(2);
|
|
CREATE TABLE t2 (f2 INT) ENGINE=MyISAM;
|
|
INSERT INTO t2 VALUES (2),(3);
|
|
CREATE TABLE t3 (f3 INT) ENGINE=MyISAM;
|
|
INSERT INTO t3 VALUES (3),(4);
|
|
ANALYZE FORMAT=JSON
|
|
SELECT GROUP_CONCAT(f3) AS gc, ( SELECT MAX(f1) FROM t1, t2 WHERE f2 = f3 ) sq
|
|
FROM t2, t3
|
|
WHERE f3 IN ( 1, 2 )
|
|
GROUP BY sq ORDER BY gc;
|
|
ANALYZE
|
|
{
|
|
"query_block": {
|
|
"select_id": 1,
|
|
"r_loops": 1,
|
|
"volatile parameter": "REPLACED",
|
|
"filesort": {
|
|
"r_loops": 1,
|
|
"volatile parameter": "REPLACED",
|
|
"r_used_priority_queue": false,
|
|
"r_output_rows": 0,
|
|
"volatile parameter": "REPLACED",
|
|
"filesort": {
|
|
"r_loops": 1,
|
|
"volatile parameter": "REPLACED",
|
|
"r_used_priority_queue": false,
|
|
"r_output_rows": 0,
|
|
"volatile parameter": "REPLACED",
|
|
"temporary_table": {
|
|
"temporary_table": {
|
|
"table": {
|
|
"table_name": "t2",
|
|
"access_type": "ALL",
|
|
"r_loops": 1,
|
|
"rows": 2,
|
|
"r_rows": 2,
|
|
"volatile parameter": "REPLACED",
|
|
"filtered": 100,
|
|
"r_filtered": 100
|
|
},
|
|
"block-nl-join": {
|
|
"table": {
|
|
"table_name": "t3",
|
|
"access_type": "ALL",
|
|
"r_loops": 1,
|
|
"rows": 2,
|
|
"r_rows": 2,
|
|
"volatile parameter": "REPLACED",
|
|
"filtered": 100,
|
|
"r_filtered": 0,
|
|
"attached_condition": "(t3.f3 in (1,2))"
|
|
},
|
|
"buffer_type": "flat",
|
|
"buffer_size": "256Kb",
|
|
"join_type": "BNL",
|
|
"r_filtered": null
|
|
},
|
|
"subqueries": [
|
|
{
|
|
"expression_cache": {
|
|
"state": "uninitialized",
|
|
"r_loops": 0,
|
|
"query_block": {
|
|
"select_id": 2,
|
|
"table": {
|
|
"table_name": "t1",
|
|
"access_type": "ALL",
|
|
"r_loops": 0,
|
|
"rows": 2,
|
|
"r_rows": null,
|
|
"filtered": 100,
|
|
"r_filtered": null
|
|
},
|
|
"block-nl-join": {
|
|
"table": {
|
|
"table_name": "t2",
|
|
"access_type": "ALL",
|
|
"r_loops": 0,
|
|
"rows": 2,
|
|
"r_rows": null,
|
|
"filtered": 100,
|
|
"r_filtered": null
|
|
},
|
|
"buffer_type": "flat",
|
|
"buffer_size": "256Kb",
|
|
"join_type": "BNL",
|
|
"attached_condition": "(t2.f2 = t3.f3)",
|
|
"r_filtered": null
|
|
}
|
|
}
|
|
}
|
|
}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
drop table t1,t2,t3;
|