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MDEV-9234 Add Type_handler::union_element_finalize()

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This commit is contained in:
Alexander Barkov
2019-04-23 13:45:28 +04:00
parent a765b19e5c
commit baadbe9601
3 changed files with 27 additions and 5 deletions
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9
sql/sql_type.h
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@ -3356,6 +3356,14 @@ public:
virtual Field *make_conversion_table_field(TABLE *TABLE,
uint metadata,
const Field *target) const= 0;
/*
Performs the final data type validation for a UNION element,
after the regular "aggregation for result" was done.
*/
virtual bool union_element_finalize(const Item * item) const
{
return false;
}
// Automatic upgrade, e.g. for ALTER TABLE t1 FORCE
virtual void Column_definition_implicit_upgrade(Column_definition *c) const
{ }
@ -4580,6 +4588,7 @@ public:
void sortlength(THD *thd,
const Type_std_attributes *item,
SORT_FIELD_ATTR *attr) const;
bool union_element_finalize(const Item * item) const;
bool Column_definition_prepare_stage1(THD *thd,
MEM_ROOT *mem_root,
Column_definition *c,