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Add support for user-defined I/O conversion casts.

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This commit is contained in:
Heikki Linnakangas
2008-10-31 08:39:22 +00:00
parent 34e37d58ed
commit 092bc49653
14 changed files with 396 additions and 269 deletions
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15
src/backend/parser/gram.y
View File

@@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.632 2008/10/29 11:24:53 petere Exp $
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.633 2008/10/31 08:39:20 heikki Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -4590,6 +4590,7 @@ CreateCastStmt: CREATE CAST '(' Typename AS Typename ')'
n->targettype = $6;
n->func = $10;
n->context = (CoercionContext) $11;
n->inout = false;
$$ = (Node *)n;
}
| CREATE CAST '(' Typename AS Typename ')'
@@ -4600,6 +4601,18 @@ CreateCastStmt: CREATE CAST '(' Typename AS Typename ')'
n->targettype = $6;
n->func = NULL;
n->context = (CoercionContext) $10;
n->inout = false;
$$ = (Node *)n;
}
| CREATE CAST '(' Typename AS Typename ')'
WITH INOUT cast_context
{
CreateCastStmt *n = makeNode(CreateCastStmt);
n->sourcetype = $4;
n->targettype = $6;
n->func = NULL;
n->context = (CoercionContext) $10;
n->inout = true;
$$ = (Node *)n;
}
;

24
src/backend/parser/parse_coerce.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_coerce.c,v 2.170 2008/10/25 17:19:09 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_coerce.c,v 2.171 2008/10/31 08:39:21 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1909,11 +1909,23 @@ find_coercion_pathway(Oid targetTypeId, Oid sourceTypeId,
/* Rely on ordering of enum for correct behavior here */
if (ccontext >= castcontext)
{
*funcid = castForm->castfunc;
if (OidIsValid(*funcid))
result = COERCION_PATH_FUNC;
else
result = COERCION_PATH_RELABELTYPE;
switch (castForm->castmethod)
{
case COERCION_METHOD_FUNCTION:
result = COERCION_PATH_FUNC;
*funcid = castForm->castfunc;
break;
case COERCION_METHOD_INOUT:
result = COERCION_PATH_COERCEVIAIO;
break;
case COERCION_METHOD_BINARY:
result = COERCION_PATH_RELABELTYPE;
break;
default:
elog(ERROR, "unrecognized castmethod: %d",
(int) castForm->castmethod);
break;
}
}
ReleaseSysCache(tuple);