diff options
Diffstat (limited to 'sql/item.cc')
| -rw-r--r-- | sql/item.cc | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/sql/item.cc b/sql/item.cc index 267560b0709..a17336ea634 100644 --- a/sql/item.cc +++ b/sql/item.cc @@ -408,6 +408,7 @@ bool DTCollation::aggregate(DTCollation &dt, bool superset_conversion) Item_field::Item_field(Field *f) :Item_ident(NullS, f->table_name, f->field_name), + item_equal(0), have_privileges(0), any_privileges(0) { set_field(f); @@ -418,6 +419,7 @@ Item_field::Item_field(Field *f) Item_field::Item_field(THD *thd, Field *f) :Item_ident(NullS, thd->strdup(f->table_name), thd->strdup(f->field_name)), + item_equal(0), have_privileges(0), any_privileges(0) { set_field(f); @@ -434,6 +436,7 @@ Item_field::Item_field(THD *thd, Item_field *item) any_privileges(item->any_privileges) { collation.set(DERIVATION_IMPLICIT); + item_equal= item->item_equal; } void Item_field::set_field(Field *field_par) @@ -1582,7 +1585,29 @@ void Item_field::cleanup() I.e. we can drop 'field'. */ field= result_field= 0; - DBUG_VOID_RETURN; +} + +/* + Find a field among specified multiple equalities + + SYNOPSIS + find_item_equal() + cond_equal reference to list of multiple equalities where + the field (this object) is to be looked for + + DESCRIPTION + The function first searches the field among multiple equalities + of the current level (in the cond_equal->current_level list). + If it fails, it continues searching in upper levels accessed + through a pointer cond_equal->upper_levels. + The search terminates as soon as a multiple equality containing + the field is found. + + RETURN VALUES + First Item_equal containing the field, if success + 0, otherwise +*/ + } void Item::init_make_field(Send_field *tmp_field, |