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MDEV-29495 Generalize can_convert_xxx() hook engine API to cover any arbitrary data type

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This commit is contained in:
Alexander Barkov
2022-10-26 14:48:03 +04:00
parent 29633dc0c0
commit ce443c8554
7 changed files with 43 additions and 87 deletions
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19
sql/handler.h
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@ -4851,23 +4851,8 @@ public:
These functions check for such possibility.
Implementation could be based on Field_xxx::is_equal()
*/
virtual bool can_convert_string(const Field_string *field,
const Column_definition &new_type) const
{
return false;
}
virtual bool can_convert_varstring(const Field_varstring *field,
const Column_definition &new_type) const
{
return false;
}
virtual bool can_convert_blob(const Field_blob *field,
const Column_definition &new_type) const
{
return false;
}
virtual bool can_convert_geom(const Field_geom *field,
const Column_definition &new_type) const
virtual bool can_convert_nocopy(const Field &,
const Column_definition &) const
{
return false;
}