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new optimisation for ref_null (SCRUM) (WL#818)

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mysql-test/r/subselect.result:
  results of new optimisation
mysql-test/t/subselect.test:
  results of new optimisation
sql/item_cmpfunc.h:
  function type
sql/item_func.h:
  function type
sql/item_subselect.cc:
  new optimisation for ref_or_null
sql/item_subselect.h:
  new optimisation for ref_or_null
sql/sql_select.cc:
  new optimisation for ref_or_null
sql/sql_select.h:
  item_subselect.cc need safe_index_read
This commit is contained in:
unknown
2003-07-17 19:39:31 +03:00
parent 04c6e88c0e
commit ed8be699fe
8 changed files with 90 additions and 32 deletions
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sql/sql_select.h
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@ -411,3 +411,4 @@ bool cp_buffer_from_ref(TABLE_REF *ref);
bool error_if_full_join(JOIN *join);
void relink_tables(SELECT_LEX *select_lex);
int report_error(TABLE *table, int error);
int safe_index_read(JOIN_TAB *tab);