diff options
Diffstat (limited to 'sql/sql_union.cc')
| -rw-r--r-- | sql/sql_union.cc | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/sql/sql_union.cc b/sql/sql_union.cc index 5bdff4dc9bf..ad14d2e4ecd 100644 --- a/sql/sql_union.cc +++ b/sql/sql_union.cc @@ -335,6 +335,35 @@ bool st_select_lex_unit::prepare(THD *thd_arg, select_result *sel_result, } } + /* + Disable the usage of fulltext searches in the last union branch. + This is a temporary 5.x limitation because of the way the fulltext + search functions are handled by the optimizer. + This is manifestation of the more general problems of "taking away" + parts of a SELECT statement post-fix_fields(). This is generally not + doable since various flags are collected in various places (e.g. + SELECT_LEX) that carry information about the presence of certain + expressions or constructs in the parts of the query. + When part of the query is taken away it's not clear how to "divide" + the meaning of these accumulated flags and what to carry over to the + recipient query (SELECT_LEX). + */ + if (global_parameters->ftfunc_list->elements && + global_parameters->order_list.elements && + global_parameters != fake_select_lex) + { + ORDER *ord; + Item_func::Functype ft= Item_func::FT_FUNC; + for (ord= (ORDER*)global_parameters->order_list.first; ord; ord= ord->next) + if ((*ord->item)->walk (&Item::find_function_processor, FALSE, + (uchar *) &ft)) + { + my_error (ER_CANT_USE_OPTION_HERE, MYF(0), "MATCH()"); + goto err; + } + } + + create_options= (first_sl->options | thd_arg->variables.option_bits | TMP_TABLE_ALL_COLUMNS); /* @@ -669,7 +698,7 @@ bool st_select_lex_unit::cleanup() { ORDER *ord; for (ord= (ORDER*)global_parameters->order_list.first; ord; ord= ord->next) - (*ord->item)->cleanup(); + (*ord->item)->walk (&Item::cleanup_processor, 0, 0); } } |