Type Type_getCoerceIn(Type self, Type other)
{
Oid funcId;
Type coerce;
Oid fromOid = other->typeId;
Oid toOid = self->typeId;
if(self->inCoercions != 0)
{
coerce = HashMap_getByOid(self->inCoercions, fromOid);
if(coerce != 0)
return coerce;
}
if (!find_coercion_pathway(toOid, fromOid, COERCION_EXPLICIT, &funcId))
{
elog(ERROR, "no conversion function from %s to %s",
format_type_be(fromOid),
format_type_be(toOid));
}
if(funcId == InvalidOid)
/*
* Binary compatible type. No need for a special coercer
*/
return self;
if(self->inCoercions == 0)
self->inCoercions = HashMap_create(7, GetMemoryChunkContext(self));
coerce = Coerce_createIn(self, other, funcId);
HashMap_putByOid(self->inCoercions, fromOid, coerce);
return coerce;
}
/*
* Determine how we want to render values of a given type in datum_to_jsonb.
*
* Given the datatype OID, return its JsonbTypeCategory, as well as the type's
* output function OID. If the returned category is JSONBTYPE_JSONCAST,
* we return the OID of the relevant cast function instead.
*/
static void
jsonb_categorize_type(Oid typoid,
JsonbTypeCategory *tcategory,
Oid *outfuncoid)
{
bool typisvarlena;
/* Look through any domain */
typoid = getBaseType(typoid);
*outfuncoid = InvalidOid;
/*
* We need to get the output function for everything except date and
* timestamp types, booleans, array and composite types, json and jsonb,
* and non-builtin types where there's a cast to json. In this last case
* we return the oid of the cast function instead.
*/
switch (typoid)
{
case BOOLOID:
*tcategory = JSONBTYPE_BOOL;
break;
case INT2OID:
case INT4OID:
case INT8OID:
case FLOAT4OID:
case FLOAT8OID:
case NUMERICOID:
getTypeOutputInfo(typoid, outfuncoid, &typisvarlena);
*tcategory = JSONBTYPE_NUMERIC;
break;
case DATEOID:
*tcategory = JSONBTYPE_DATE;
break;
case TIMESTAMPOID:
*tcategory = JSONBTYPE_TIMESTAMP;
break;
case TIMESTAMPTZOID:
*tcategory = JSONBTYPE_TIMESTAMPTZ;
break;
case JSONBOID:
*tcategory = JSONBTYPE_JSONB;
break;
case JSONOID:
*tcategory = JSONBTYPE_JSON;
break;
default:
/* Check for arrays and composites */
if (OidIsValid(get_element_type(typoid)))
*tcategory = JSONBTYPE_ARRAY;
else if (type_is_rowtype(typoid))
*tcategory = JSONBTYPE_COMPOSITE;
else
{
/* It's probably the general case ... */
*tcategory = JSONBTYPE_OTHER;
/*
* but first let's look for a cast to json (note: not to
* jsonb) if it's not built-in.
*/
if (typoid >= FirstNormalObjectId)
{
Oid castfunc;
CoercionPathType ctype;
ctype = find_coercion_pathway(JSONOID, typoid,
COERCION_EXPLICIT, &castfunc);
if (ctype == COERCION_PATH_FUNC && OidIsValid(castfunc))
{
*tcategory = JSONBTYPE_JSONCAST;
*outfuncoid = castfunc;
}
else
{
/* not a cast type, so just get the usual output func */
getTypeOutputInfo(typoid, outfuncoid, &typisvarlena);
}
}
else
{
/* any other builtin type */
getTypeOutputInfo(typoid, outfuncoid, &typisvarlena);
}
break;
}
}
}
