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f888026fdc
Added a test case for bug #5333. null_key.result, key_primary.result: Made covering index usable for const tables. sql_select.cc: Made covering index usable for const tables: downported the corresponding code from 4.1. Simultaneously fixed bug #5333 reported for 4.1. The bug was due to the fact that field index in join structures was always set to 0 for const tables.
20 lines
539 B
Text
20 lines
539 B
Text
drop table if exists t1;
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create table t1 (t1 char(3) primary key);
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insert into t1 values("ABC");
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insert into t1 values("ABA");
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insert into t1 values("AB%");
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select * from t1 where t1="ABC";
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t1
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ABC
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select * from t1 where t1="ABCD";
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t1
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select * from t1 where t1 like "a_\%";
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t1
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AB%
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describe select * from t1 where t1="ABC";
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table type possible_keys key key_len ref rows Extra
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t1 const PRIMARY PRIMARY 3 const 1 Using index
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describe select * from t1 where t1="ABCD";
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Comment
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Impossible WHERE noticed after reading const tables
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drop table t1;
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