Function defGetNumeric

src/backend/commands/define.c:84–105

* Extract a numeric value (actually double) from a DefElem. */

 * Extract a numeric value (actually double) from a DefElem.
 */
double
defGetNumeric(DefElem *def)
{
	if (def->arg == NULL)
		ereport(ERROR,
				(errcode(ERRCODE_SYNTAX_ERROR),
				 errmsg("%s requires a numeric value",
						def->defname)));
	switch (nodeTag(def->arg))
	{
		case T_Integer:
			return (double) intVal(def->arg);
		case T_Float:
			return floatVal(def->arg);
		default:
			ereport(ERROR,
					(errcode(ERRCODE_SYNTAX_ERROR),
					 errmsg("%s requires a numeric value",
							def->defname)));
	}
	return 0;					/* keep compiler quiet */
}

/*
 * Extract a boolean value from a DefElem.