Function DropErrorMsgNonExistent

src/backend/commands/tablecmds.c:1754–1797

* Emit the right error or warning message for a "DROP" command issued on a * non-existent relation */

 * non-existent relation
 */
static void
DropErrorMsgNonExistent(RangeVar *rel, char rightkind, bool missing_ok)
{
	const struct dropmsgstrings *rentry;

	if (rel->schemaname != NULL &&
		!OidIsValid(LookupNamespaceNoError(rel->schemaname)))
	{
		if (!missing_ok)
		{
			ereport(ERROR,
					(errcode(ERRCODE_UNDEFINED_SCHEMA),
					 errmsg("schema \"%s\" does not exist", rel->schemaname)));
		}
		else
		{
			ereport(NOTICE,
					(errmsg("schema \"%s\" does not exist, skipping",
							rel->schemaname)));
		}
		return;
	}

	for (rentry = dropmsgstringarray; rentry->kind != '\0'; rentry++)
	{
		if (rentry->kind == rightkind)
		{
			if (!missing_ok)
			{
				ereport(ERROR,
						(errcode(rentry->nonexistent_code),
						 errmsg(rentry->nonexistent_msg, rel->relname)));
			}
			else
			{
				if (Gp_role != GP_ROLE_EXECUTE)
					ereport(NOTICE, (errmsg(rentry->skipping_msg, rel->relname)));
				break;
			}
		}
	}

	Assert(rentry->kind != '\0');	/* Should be impossible */
}

/*
 * Emit the right error message for a "DROP" command issued on a