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e987b9350c
(Review input addressed)
(Added handling of UPDATE/DELETE and partitioning w/o index)
If the properties of the used collation allow, do the following
equivalent rewrites:
1. UPPER(key_col)=expr -> key_col=expr
expr=UPPER(key_col) -> expr=key_col
(also rewrite both sides of the equality at the same time)
2. UPPER(key_col) IN (constant-list) -> key_col IN (constant-list)
- Mark utf8mb{3,4}_general_ci as collations that allow this.
- Add optimizer_switch='sargable_casefold=ON' to control this.
(ON by default in this patch)
- Cover the rewrite in Optimizer Trace, rewrite name is
"sargable_casefold_removal".
44 lines
978 B
SQL
44 lines
978 B
SQL
# Check sargable_casefold rewrite for $collation
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eval create table t1 (
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col1 varchar(32),
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col2 varchar(32),
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col3 char(32),
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col4 text,
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key(col1),
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key(col2),
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key(col3),
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key(col4(32))
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) collate $collation;
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insert into t1
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select
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concat('A-', seq),
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concat('A-', seq),
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concat('A-', seq),
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concat('A-', seq)
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from seq_1_to_100;
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analyze table t1 persistent for all;
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--echo # Basic examples. All should use ref(col1):
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explain
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select * from t1 where upper(col1)='A-3';
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select * from t1 where upper(col1)='A-3';
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explain
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select * from t1 where ucase(col1)='a-3';
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select * from t1 where ucase(col1)='a-3';
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explain select * from t1 where 'abc'=upper(col1);
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explain select * from t1 where 'xyz'=ucase(col1);
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create view v1 as select * from t1;
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explain select * from v1 where 'abc'=upper(col1);
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drop view v1;
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explain select * from t1 where upper(col3)='a-3';
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explain select * from t1 where upper(col4)='a-3';
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# DROP TABLE t1 is missing intentionally here.
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