Function transformXmlSerialize

src/backend/parser/parse_expr.c:2522–2563

}

static Node *
transformXmlSerialize(ParseState *pstate, XmlSerialize *xs)
{
	Node	   *result;
	XmlExpr    *xexpr;
	Oid			targetType;
	int32		targetTypmod;

	xexpr = makeNode(XmlExpr);
	xexpr->op = IS_XMLSERIALIZE;
	xexpr->args = list_make1(coerce_to_specific_type(pstate,
													 transformExprRecurse(pstate, xs->expr),
													 XMLOID,
													 "XMLSERIALIZE"));

	typenameTypeIdAndMod(pstate, xs->typeName, &targetType, &targetTypmod);

	xexpr->xmloption = xs->xmloption;
	xexpr->location = xs->location;
	/* We actually only need these to be able to parse back the expression. */
	xexpr->type = targetType;
	xexpr->typmod = targetTypmod;

	/*
	 * The actual target type is determined this way.  SQL allows char and
	 * varchar as target types.  We allow anything that can be cast implicitly
	 * from text.  This way, user-defined text-like data types automatically
	 * fit in.
	 */
	result = coerce_to_target_type(pstate, (Node *) xexpr,
								   TEXTOID, targetType, targetTypmod,
								   COERCION_IMPLICIT,
								   COERCE_IMPLICIT_CAST,
								   -1);
	if (result == NULL)
		ereport(ERROR,
				(errcode(ERRCODE_CANNOT_COERCE),
				 errmsg("cannot cast XMLSERIALIZE result to %s",
						format_type_be(targetType)),
				 parser_errposition(pstate, xexpr->location)));
	return result;
}

static Node *
transformBooleanTest(ParseState *pstate, BooleanTest *b)