Function transformRowExpr

src/backend/parser/parse_expr.c:2163–2199

}

static Node *
transformRowExpr(ParseState *pstate, RowExpr *r, bool allowDefault)
{
	RowExpr    *newr;
	char		fname[16];
	int			fnum;

	newr = makeNode(RowExpr);

	/* Transform the field expressions */
	newr->args = transformExpressionList(pstate, r->args,
										 pstate->p_expr_kind, allowDefault);

	/* Disallow more columns than will fit in a tuple */
	if (list_length(newr->args) > MaxTupleAttributeNumber)
		ereport(ERROR,
				(errcode(ERRCODE_TOO_MANY_COLUMNS),
				 errmsg("ROW expressions can have at most %d entries",
						MaxTupleAttributeNumber),
				 parser_errposition(pstate, r->location)));

	/* Barring later casting, we consider the type RECORD */
	newr->row_typeid = RECORDOID;
	newr->row_format = COERCE_IMPLICIT_CAST;

	/* ROW() has anonymous columns, so invent some field names */
	newr->colnames = NIL;
	for (fnum = 1; fnum <= list_length(newr->args); fnum++)
	{
		snprintf(fname, sizeof(fname), "f%d", fnum);
		newr->colnames = lappend(newr->colnames, makeString(pstrdup(fname)));
	}

	newr->location = r->location;

	return (Node *) newr;
}

static Node *
transformTableValueExpr(ParseState *pstate, TableValueExpr *t)