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169 lines
4.9 KiB
Text
169 lines
4.9 KiB
Text
#
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# Test character set narrowing
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#
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--source include/have_utf8mb4.inc
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--source include/have_sequence.inc
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--source include/not_embedded.inc
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set
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@tmp_csetn_os= @@optimizer_switch,
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optimizer_switch='cset_narrowing=on';
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set names utf8mb4;
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create table t1 (
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mb3name varchar(32),
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mb3 varchar(32) collate utf8mb3_general_ci,
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key(mb3)
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);
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insert into t1 select seq, seq from seq_1_to_10000;
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insert into t1 values ('mb3-question-mark', '?');
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insert into t1 values ('mb3-replacement-char', _utf8mb3 0xEFBFBD);
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create table t10 (
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pk int auto_increment primary key,
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mb4name varchar(32),
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mb4 varchar(32) character set utf8mb4 collate utf8mb4_general_ci
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);
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insert into t10 (mb4name, mb4) values
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('mb4-question-mark','?'),
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('mb4-replacement-char', _utf8mb4 0xEFBFBD),
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('mb4-smiley', _utf8mb4 0xF09F988A),
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('1', '1');
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analyze table t1,t10 persistent for all;
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--echo #
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--echo # Check that constants are already handled: the following should use
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--echo # ref/range, because constants are converted into utf8mb3.
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--echo #
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select collation('abc');
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explain select * from t1 force index (mb3) where t1.mb3='abc';
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explain select * from t1 force index (mb3) where t1.mb3 in ('abc','cde','xyz');
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explain select * from t1 force index (mb3) where t1.mb3 between 'abc' and 'acc';
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explain select * from t1 force index (mb3) where t1.mb3 <'000';
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--echo # If a constant can't be represented in utf8mb3, an error is produced:
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--error ER_CANT_AGGREGATE_2COLLATIONS
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explain select * from t1 force index (mb3) where t1.mb3='😊';
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--echo #
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--echo # Check ref access on mb3_field=mb4_field
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--echo #
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--source include/explain-no-costs.inc
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explain format=json
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select * from t10,t1 where t10.mb4=t1.mb3;
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select * from t10,t1 where t10.mb4=t1.mb3;
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select * from t10,t1 use index() where t10.mb4=t1.mb3;
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--source include/explain-no-costs.inc
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explain format=json
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select * from t10,t1 where t10.mb4<=>t1.mb3;
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select * from t10,t1 where t10.mb4<=>t1.mb3;
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--source include/explain-no-costs.inc
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set statement optimizer_switch='cset_narrowing=off', join_cache_level=0 for
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explain format=json
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select * from t10,t1 where t10.mb4=t1.mb3;
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--echo #
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--echo # Check ref access on mb3_field=mb4_expr
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--echo #
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--source include/explain-no-costs.inc
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explain format=json
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select * from t10,t1 where t1.mb3=concat('',t10.mb4);
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select * from t10,t1 where t1.mb3=concat('',t10.mb4);
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select * from t10,t1 use index() where t1.mb3=concat('',t10.mb4);
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--echo # Check that ref optimizer gets the right constant.
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--echo # We need a const table for that, because key=const is handled by
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--echo # coercing the constant.
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--echo #
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--echo # So, we take the smiley:
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select * from t10 where t10.pk=3;
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set optimizer_trace=1;
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--echo # And see that we've got the Replacement Character in the ranges:
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explain
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select * from t10, t1 where t10.mb4=t1.mb3 and t10.pk=3;
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#Enable after fix MDEV-32034
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--disable_view_protocol
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--source include/explain-no-costs.inc
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select
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json_detailed(json_extract(trace, '$**.range_scan_alternatives')) as JS
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from
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information_schema.optimizer_trace;
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--enable_view_protocol
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select * from t10, t1 where t10.mb4=t1.mb3 and t10.pk=3;
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--echo #
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--echo # Will range optimizer handle t1.mb3>t10.mb4? No...
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--echo #
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--source include/explain-no-costs.inc
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explain format=json
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select * from t10, t1 where (t1.mb3=t10.mb4 or t1.mb3='hello') and t10.pk=3;
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--source include/explain-no-costs.inc
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explain format=json
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select * from t10, t1 where t1.mb3>t10.mb4 and t10.pk=3;
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--echo # For comparison, it will handle it when collations match:
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create table t2 (
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mb4name varchar(32),
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mb4 varchar(32) collate utf8mb4_general_ci,
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key(mb4)
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);
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insert into t2 select * from t1;
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--source include/explain-no-costs.inc
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explain format=json
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select * from t10, t2 where t2.mb4>t10.mb4 and t10.pk=3;
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--echo #
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--echo # Check multiple equalities
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--echo #
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--echo # - ref acccess lookup keys do use equality substitution,
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--echo # - concat() arguments don't
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#Enable after fix MDEV-32034
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--disable_view_protocol
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--source include/explain-no-costs.inc
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explain format=json
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select straight_join * from t10,t1 force index(mb3),t2
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where
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t1.mb3=t2.mb4 and t2.mb4=t10.mb4 and concat(t1.mb3, t2.mb4, t10.mb4)<>'Bebebe';
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select json_detailed(json_extract(trace, '$**.condition_processing')) as JS
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from information_schema.optimizer_trace;
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--enable_view_protocol
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select straight_join * from t10,t1 force index(mb3),t2
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where
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t1.mb3=t2.mb4 and t2.mb4=t10.mb4 and concat(t1.mb3, t2.mb4, t10.mb4)<>'Bebebe';
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--echo # Equality substitution doesn't happen for constants, for both narrowing
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--echo # and non-narrowing comparisons:
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--source include/explain-no-costs.inc
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explain format=json
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select * from t10,t1,t2
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where
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t1.mb3=t2.mb4 and t2.mb4=t10.mb4 and t10.mb4='hello' and
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concat(t1.mb3, t2.mb4, t10.mb4)<>'Bebebe';
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#Enable after fix MDEV-32034
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--disable_view_protocol
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select json_detailed(json_extract(trace, '$**.condition_processing')) as JS
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from information_schema.optimizer_trace;
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--enable_view_protocol
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drop table t2;
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drop table t1, t10;
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set optimizer_switch=@tmp_csetn_os;
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