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MDEV-34993, part2: backport optimizer_adjust_secondary_key_costs

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...and make the fix for MDEV-34993 switchable. It is enabled by default
and controlled with @optimizer_adjust_secondary_key_costs=fix_card_multiplier
This commit is contained in:
Sergei Petrunia
2024-09-24 10:23:34 +03:00
parent 8166a5d33d
commit 1cda4726ca
9 changed files with 175 additions and 1 deletions
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5
sql/sql_priv.h
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@ -266,6 +266,11 @@
OPTIMIZER_SWITCH_COND_PUSHDOWN_FROM_HAVING | \
OPTIMIZER_SWITCH_OPTIMIZE_JOIN_BUFFER_SIZE)
/*
See adjust_secondary_key_cost in sys_vars.cc for symbolic names.
*/
#define OPTIMIZER_ADJ_FIX_CARD_MULT (1)
/*
Replication uses 8 bytes to store SQL_MODE in the binary log. The day you
use strictly more than 64 bits by adding one more define above, you should