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MDEV-29129: Performance regression starting in 10.6: select order by limit ...

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The cause of regression was handling for ROWNUM() function.
For queries like

  SELECT ROWNUM() FROM ... ORDER BY ...

ROWNUM() should be computed before the ORDER BY.
The computation was moved to be before the ORDER BY for any entries in
the select list that had RAND_TABLE_BIT set.

This had a negative impact on queries in form:

  SELECT sp_func() FROM t1 ORDER BY ... LIMIT n

where sp_func() is NOT declared as DETERMINISTIC (and so has
RAND_TABLE_BIT set).

The fix is to require evaluation for sorting only for the ROWNUM()
function. Functions that just have RAND_TABLE_BIT() can be computed
after ORDER BY ... LIMIT is applied.

(think about a possible index that satisfies the ORDER BY clause. In
that case, the the rows would be read in the needed order and we would
stop after reading LIMIT rows, achieving the same effect).
This commit is contained in:
Sergei Petrunia
2022-12-02 18:21:52 +03:00
parent 072b3668ca
commit e0dbec1ce3
11 changed files with 94 additions and 17 deletions
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5
sql/sql_select.h
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@ -1420,11 +1420,6 @@ public:
GROUP/ORDER BY.
*/
bool simple_order, simple_group;
/*
Set to 1 if any field in field list has RAND_TABLE set. For example if
if one uses RAND() or ROWNUM() in field list
*/
bool rand_table_in_field_list;
/*
ordered_index_usage is set if an ordered index access