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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_class.h
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@@ -672,6 +672,11 @@ typedef struct system_variables
ulonglong sortbuff_size;
ulonglong default_regex_flags;
ulonglong max_mem_used;
/*
A bitmap of OPTIMIZER_ADJ_* flags (defined in sql_priv.h).
See sys_vars.cc:adjust_secondary_key_cost for symbolic names.
*/
ulonglong optimizer_adjust_secondary_key_costs;
/**
Place holders to store Multi-source variables in sys_var.cc during