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MDEV-27277 Add a warning when max_sort_length is reached

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During a query execution some sorting and grouping operations
on strings may be involved. System variable max_sort_length defines
the maximum number of bytes to use when comparing strings during
sorting/grouping. Thus, the comparable parts of strings may be less
than their actual size, so the results of the query may be not
sorted/grouped properly.
To indicate that some comparisons were done on a truncated lengths,
a new warning has been introduced with this commit.
This commit is contained in:
Oleg Smirnov
2023-09-04 13:15:06 +07:00
parent 0d17c540a5
commit fd87e01f38
20 changed files with 432 additions and 28 deletions
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mysql-test/suite/innodb_zip/r/prefix_index_liftedlimit.result
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@@ -767,6 +767,8 @@ SELECT col_1_text = REPEAT("क", 4000) FROM worklog5743 ORDER BY col_1_text;
col_1_text = REPEAT("क", 4000)
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Warnings:
Warning 4202 2 values were longer than max_sort_length. Sorting used only the first 1024 bytes
DROP TABLE worklog5743;
CREATE TABLE worklog5743 (
col_1_text TEXT(4000) , col_2_text TEXT(4000) ,