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MDEV-36106 New-style hints: [NO_]DERIVED_CONDITION_PUSHDOWN, [NO_]MERGE

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Implements and tests the optimizer hints DERIVED_CONDITION_PUSHDOWN
and NO_DERIVED_CONDITION_PUSHDOWN, table-level hints to enable and
disable, respectively, the condition pushdown for derived tables
which is typically controlled by the condition_pushdown_for_derived
optimizer switch.

Implements and tests the optimizer hints MERGE and NO_MERGE, table-level
hints to enable and disable, respectively, the derived_merge optimization
which is typically controlled by the derived_merge optimizer switch.

Sometimes hints need to be fixed before TABLE instances are available, but
after TABLE_LIST instances have been created (as in the cases of MERGE and
NO_MERGE).  This commit introduces a new function called
fix_hints_for_derived_table to allow early hint fixing for derived tables,
using only a TABLE_LIST instance (so long as such hints are not index-level).
This commit is contained in:
Dave Gosselin
2025-02-24 11:32:27 -05:00
committed by Dave Gosselin
parent e653666368
commit 2ee2e2d0f3
10 changed files with 3367 additions and 41 deletions
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14
sql/opt_hints_parser.h
View File

@@ -48,6 +48,8 @@ enum opt_hints_enum
JOIN_SUFFIX_HINT_ENUM,
JOIN_ORDER_HINT_ENUM,
JOIN_FIXED_ORDER_HINT_ENUM,
DERIVED_CONDITION_PUSHDOWN_HINT_ENUM,
MERGE_HINT_ENUM,
MAX_HINT_ENUM // This one must be the last in the list
};
@@ -112,7 +114,11 @@ public:
keyword_JOIN_PREFIX,
keyword_JOIN_SUFFIX,
keyword_JOIN_ORDER,
keyword_JOIN_FIXED_ORDER
keyword_JOIN_FIXED_ORDER,
keyword_DERIVED_CONDITION_PUSHDOWN,
keyword_NO_DERIVED_CONDITION_PUSHDOWN,
keyword_MERGE,
keyword_NO_MERGE
};
class Token: public Lex_cstring
@@ -363,7 +369,11 @@ private:
return id == TokenID::keyword_BKA ||
id == TokenID::keyword_BNL ||
id == TokenID::keyword_NO_BKA ||
id == TokenID::keyword_NO_BNL;
id == TokenID::keyword_NO_BNL ||
id == TokenID::keyword_DERIVED_CONDITION_PUSHDOWN ||
id == TokenID::keyword_NO_DERIVED_CONDITION_PUSHDOWN ||
id == TokenID::keyword_MERGE ||
id == TokenID::keyword_NO_MERGE;
}
};
class Table_level_hint_type: public TokenChoice<Parser,