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Replace 0.001 with symbolic name COST_EPS

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optimize_straight_join and best_extension_by_limited_search()
use 0.001 to make choice between plans with identical cost deterministic.

Use COST_EPS instead of 0.001, like it's done in newer versions.
This commit is contained in:
Sergei Petrunia
2024-10-10 16:11:37 +03:00
parent cd5577ba4a
commit 5619f29384
1 changed files with 2 additions and 2 deletions
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sql/sql_select.cc
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@@ -9662,7 +9662,7 @@ optimize_straight_join(JOIN *join, table_map remaining_tables)
memcpy((uchar*) join->best_positions, (uchar*) join->positions,
sizeof(POSITION)*idx);
join->join_record_count= record_count;
join->best_read= read_time - 0.001;
join->best_read= read_time - COST_EPS;
}
@@ -11093,7 +11093,7 @@ best_extension_by_limited_search(JOIN *join,
memcpy((uchar*) join->best_positions, (uchar*) join->positions,
sizeof(POSITION) * (idx + 1));
join->join_record_count= partial_join_cardinality;
join->best_read= current_read_time - 0.001;
join->best_read= current_read_time - COST_EPS;
}
DBUG_EXECUTE("opt", print_plan(join, idx+1,
current_record_count,