Details
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Task
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Status: Closed (View Workflow)
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Major
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Resolution: Fixed
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None
Description
User defined type plugins and new built-in types (implemented as always-built-in plugins) will want to do CAST.
This task will add infrastructure for such casts.
Let's add this branch into the cast_type grammar rules:
| IDENT_sys
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{
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const Type_handler *h; |
if (!(h= Type_handler::handler_by_name_or_error($1))) |
MYSQL_YYABORT;
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$$.set(h);
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Lex->charset= NULL;
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}
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Note, the GEOMETRY data types (which is as of time of writing 95% plugin compatible) does not support CAST for now. So for test purposes let's override the relevant method as follows:
Item *
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Type_handler_geometry::create_typecast_item(THD *thd, Item *item,
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const Type_cast_attributes &attr) |
const |
{
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DBUG_EXECUTE_IF("emulate_geometry_create_typecast_item", |
return new (thd->mem_root) Item_func_geometry_from_text(thd, item); |
);
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return NULL; |
}
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Attachments
Issue Links
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MDEV-4912 Data type plugin API version 1
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- Closed
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