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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
committed by Nikita Malyavin
parent 9d5967f74b
commit c86f813afe
3 changed files with 26 additions and 6 deletions
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12
sql/sql_type.cc
View File

@ -5933,6 +5933,18 @@ void Type_handler_geometry::Item_param_set_param_func(Item_param *param,
/***************************************************************************/
bool Type_handler_string_result::union_element_finalize(const Item * item) const
{
if (item->collation.derivation == DERIVATION_NONE)
{
my_error(ER_CANT_AGGREGATE_NCOLLATIONS, MYF(0), "UNION");
return true;
}
return false;
}
/***************************************************************************/
bool Type_handler::Vers_history_point_resolve_unit(THD *thd,
Vers_history_point *point)
const

10
sql/sql_type.h
View File

@ -1187,6 +1187,14 @@ 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;
}
virtual bool Column_definition_fix_attributes(Column_definition *c) const= 0;
virtual bool Column_definition_prepare_stage1(THD *thd,
MEM_ROOT *mem_root,
@ -2236,7 +2244,7 @@ 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,

10
sql/sql_union.cc
View File

@ -1150,12 +1150,12 @@ cont:
while ((type= tp++))
{
if (type->cmp_type() == STRING_RESULT &&
type->collation.derivation == DERIVATION_NONE)
{
my_error(ER_CANT_AGGREGATE_NCOLLATIONS, MYF(0), "UNION");
/*
Test if the aggregated data type is OK for a UNION element.
E.g. in case of string data, DERIVATION_NONE is not allowed.
*/
if (type->type_handler()->union_element_finalize(type))
goto err;
}
}
/*