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Bug #43029: FORCE INDEX FOR ORDER BY is ignored when join

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buffering is used

FORCE INDEX FOR ORDER BY now prevents the optimizer from 
using join buffering. As a result the optimizer can use
indexed access on the first table and doesn't need to 
sort the complete resultset at the end of the statement.
This commit is contained in:
Georgi Kodinov
2009-10-07 18:03:42 +03:00
parent 9226c847f5
commit 1a48dd4e2b
8 changed files with 116 additions and 12 deletions
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6
sql/sql_base.cc
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@@ -2305,7 +2305,8 @@ bool reopen_name_locked_table(THD* thd, TABLE_LIST* table_list, bool link_in)
table->tablenr=thd->current_tablenr++;
table->used_fields=0;
table->const_table=0;
table->null_row= table->maybe_null= table->force_index= 0;
table->null_row= table->maybe_null= 0;
table->force_index= table->force_index_order= table->force_index_group= 0;
table->status=STATUS_NO_RECORD;
DBUG_RETURN(FALSE);
}
@@ -2963,7 +2964,8 @@ TABLE *open_table(THD *thd, TABLE_LIST *table_list, MEM_ROOT *mem_root,
table->tablenr=thd->current_tablenr++;
table->used_fields=0;
table->const_table=0;
table->null_row= table->maybe_null= table->force_index= 0;
table->null_row= table->maybe_null= 0;
table->force_index= table->force_index_order= table->force_index_group= 0;
table->status=STATUS_NO_RECORD;
table->insert_values= 0;
table->fulltext_searched= 0;