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mirror of https://github.com/MariaDB/server.git synced 2025-07-29 05:21:33 +03:00

MDEV-9215 Detect cmp_type() and result_type() from field_type()

Part6: Deriving Item_type_holder from Type_handler_hybrid_real_field_type
This commit is contained in:
Alexander Barkov
2015-12-03 10:10:59 +04:00
parent 7d54d823a0
commit f3ff8b3529
5 changed files with 233 additions and 46 deletions

View File

@ -29,7 +29,9 @@ protected:
const Type_handler *string_type_handler(uint max_octet_length) const;
public:
static const Type_handler *get_handler_by_field_type(enum_field_types type);
static const Type_handler *get_handler_by_real_type(enum_field_types type);
virtual enum_field_types field_type() const= 0;
virtual enum_field_types real_field_type() const { return field_type(); }
virtual Item_result result_type() const= 0;
virtual Item_result cmp_type() const= 0;
virtual const Type_handler*
@ -190,6 +192,15 @@ public:
};
class Type_handler_time2: public Type_handler_temporal_result
{
public:
virtual ~Type_handler_time2() {}
enum_field_types field_type() const { return MYSQL_TYPE_TIME; }
enum_field_types real_field_type() const { return MYSQL_TYPE_TIME2; }
};
class Type_handler_date: public Type_handler_temporal_result
{
public:
@ -198,6 +209,15 @@ public:
};
class Type_handler_newdate: public Type_handler_temporal_result
{
public:
virtual ~Type_handler_newdate() {}
enum_field_types field_type() const { return MYSQL_TYPE_DATE; }
enum_field_types real_field_type() const { return MYSQL_TYPE_NEWDATE; }
};
class Type_handler_datetime: public Type_handler_temporal_result
{
public:
@ -206,6 +226,15 @@ public:
};
class Type_handler_datetime2: public Type_handler_temporal_result
{
public:
virtual ~Type_handler_datetime2() {}
enum_field_types field_type() const { return MYSQL_TYPE_DATETIME; }
enum_field_types real_field_type() const { return MYSQL_TYPE_DATETIME2; }
};
class Type_handler_timestamp: public Type_handler_temporal_result
{
public:
@ -214,6 +243,15 @@ public:
};
class Type_handler_timestamp2: public Type_handler_temporal_result
{
public:
virtual ~Type_handler_timestamp2() {}
enum_field_types field_type() const { return MYSQL_TYPE_TIMESTAMP; }
enum_field_types real_field_type() const { return MYSQL_TYPE_TIMESTAMP2; }
};
class Type_handler_olddecimal: public Type_handler_decimal_result
{
public:
@ -294,6 +332,24 @@ public:
};
class Type_handler_enum: public Type_handler_string_result
{
public:
virtual ~Type_handler_enum() {}
enum_field_types field_type() const { return MYSQL_TYPE_VARCHAR; }
virtual enum_field_types real_field_type() const { return MYSQL_TYPE_ENUM; }
};
class Type_handler_set: public Type_handler_string_result
{
public:
virtual ~Type_handler_set() {}
enum_field_types field_type() const { return MYSQL_TYPE_VARCHAR; }
virtual enum_field_types real_field_type() const { return MYSQL_TYPE_SET; }
};
/**
A handler for hybrid type functions, e.g.
COALESCE(), IF(), IFNULL(), NULLIF(), CASE,
@ -309,6 +365,9 @@ class Type_handler_hybrid_field_type: public Type_handler
const Type_handler *get_handler_by_result_type(Item_result type) const;
public:
Type_handler_hybrid_field_type();
Type_handler_hybrid_field_type(const Type_handler *handler)
:m_type_handler(handler)
{ }
Type_handler_hybrid_field_type(enum_field_types type)
:m_type_handler(get_handler_by_field_type(type))
{ }
@ -316,6 +375,10 @@ public:
:m_type_handler(other->m_type_handler)
{ }
enum_field_types field_type() const { return m_type_handler->field_type(); }
enum_field_types real_field_type() const
{
return m_type_handler->real_field_type();
}
Item_result result_type() const { return m_type_handler->result_type(); }
Item_result cmp_type() const { return m_type_handler->cmp_type(); }
void set_handler(const Type_handler *other)
@ -339,6 +402,10 @@ public:
{
return (m_type_handler= get_handler_by_field_type(type));
}
const Type_handler *set_handler_by_real_type(enum_field_types type)
{
return (m_type_handler= get_handler_by_real_type(type));
}
const Type_handler *
type_handler_adjusted_to_max_octet_length(uint max_octet_length,
CHARSET_INFO *cs) const
@ -349,4 +416,18 @@ public:
}
};
/**
This class is used for Item_type_holder, which preserves real_type.
*/
class Type_handler_hybrid_real_field_type:
public Type_handler_hybrid_field_type
{
public:
Type_handler_hybrid_real_field_type(enum_field_types type)
:Type_handler_hybrid_field_type(get_handler_by_real_type(type))
{ }
};
#endif /* SQL_TYPE_H_INCLUDED */