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MDEV-8910 Wrong metadata or field type for MAX(COALESCE(string_field))

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This commit is contained in:
Alexander Barkov
2015-10-07 11:42:23 +04:00
parent bed4e84795
commit 8afe96f011
7 changed files with 387 additions and 18 deletions
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27
sql/sql_type.h
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@ -25,12 +25,19 @@
class Type_handler
{
protected:
const Type_handler *string_type_handler(uint max_octet_length) const;
public:
virtual enum_field_types field_type() const= 0;
virtual Item_result result_type() const= 0;
virtual Item_result cmp_type() const= 0;
virtual const Type_handler*
type_handler_adjusted_to_max_octet_length(uint max_octet_length,
CHARSET_INFO *cs) const
{ return this; }
};
/*** Abstract classes for every XXX_RESULT */
class Type_handler_real_result: public Type_handler
@ -70,6 +77,9 @@ class Type_handler_string_result: public Type_handler
public:
Item_result result_type() const { return STRING_RESULT; }
Item_result cmp_type() const { return STRING_RESULT; }
const Type_handler *
type_handler_adjusted_to_max_octet_length(uint max_octet_length,
CHARSET_INFO *cs) const;
};
@ -283,10 +293,27 @@ public:
{
return (m_type_handler= get_handler_by_result_type(type));
}
const Type_handler *set_handler_by_result_type(Item_result type,
uint max_octet_length,
CHARSET_INFO *cs)
{
m_type_handler= get_handler_by_result_type(type);
return m_type_handler=
m_type_handler->type_handler_adjusted_to_max_octet_length(max_octet_length,
cs);
}
const Type_handler *set_handler_by_field_type(enum_field_types type)
{
return (m_type_handler= get_handler_by_field_type(type));
}
const Type_handler *
type_handler_adjusted_to_max_octet_length(uint max_octet_length,
CHARSET_INFO *cs) const
{
return
m_type_handler->type_handler_adjusted_to_max_octet_length(max_octet_length,
cs);
}
};
#endif /* SQL_TYPE_H_INCLUDED */