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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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22
src/backend/commands/functioncmds.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/functioncmds.c,v 1.99 2008/10/21 10:38:51 petere Exp $
* $PostgreSQL: pgsql/src/backend/commands/functioncmds.c,v 1.100 2008/10/31 08:39:20 heikki Exp $
*
* DESCRIPTION
* These routines take the parse tree and pick out the
@ -1383,6 +1383,7 @@ CreateCast(CreateCastStmt *stmt)
Oid funcid;
int nargs;
char castcontext;
char castmethod;
Relation relation;
HeapTuple tuple;
Datum values[Natts_pg_cast];
@ -1415,7 +1416,15 @@ CreateCast(CreateCastStmt *stmt)
format_type_be(sourcetypeid),
format_type_be(targettypeid))));
/* Detemine the cast method */
if (stmt->func != NULL)
castmethod = COERCION_METHOD_FUNCTION;
else if(stmt->inout)
castmethod = COERCION_METHOD_INOUT;
else
castmethod = COERCION_METHOD_BINARY;
if (castmethod == COERCION_METHOD_FUNCTION)
{
Form_pg_proc procstruct;
@ -1475,6 +1484,12 @@ CreateCast(CreateCastStmt *stmt)
ReleaseSysCache(tuple);
}
else
{
funcid = InvalidOid;
nargs = 0;
}
if (castmethod == COERCION_METHOD_BINARY)
{
int16 typ1len;
int16 typ2len;
@ -1483,10 +1498,6 @@ CreateCast(CreateCastStmt *stmt)
char typ1align;
char typ2align;
/* indicates binary coercibility */
funcid = InvalidOid;
nargs = 0;
/*
* Must be superuser to create binary-compatible casts, since
* erroneous casts can easily crash the backend.
@ -1562,6 +1573,7 @@ CreateCast(CreateCastStmt *stmt)
values[Anum_pg_cast_casttarget - 1] = ObjectIdGetDatum(targettypeid);
values[Anum_pg_cast_castfunc - 1] = ObjectIdGetDatum(funcid);
values[Anum_pg_cast_castcontext - 1] = CharGetDatum(castcontext);
values[Anum_pg_cast_castmethod - 1] = CharGetDatum(castmethod);
MemSet(nulls, ' ', Natts_pg_cast);