ROW_NUMBER函数是否与NULL强制转换表达式（RedShift）一起使用？

Question

我从Redshfit收到以下查询的错误消息：

SELECT relation_447.col_alias_1,
relation_447.col_alias_2,
relation_447.col_alias_3,
relation_447.col_alias_4,
ROW_NUMBER() OVER (PARTITION BY relation_447.col_alias_3 ORDER BY relation_447.col_alias_4 ASC) AS col_rnk
FROM (SELECT NULL::VARCHAR(60) AS col_alias_1,
X.A AS col_alias_2,
X.A AS col_alias_3,
Y.B AS col_alias_4
FROM X
LEFT JOIN Y ON X.A = Y.C) relation_447

错误讯息：

Amazon(500310) Invalid operation: ORDER/GROUP BY expression not found in targetlist;

但是，如果我将NULL::VARCHAR(60)短语替换为NULL::VARCHAR，则查询工作正常。

同样，NULL::NUMERIC的查询将失败。但如果我用NULL::BIGINT替换该短语，它将再次起作用。

我想知道这是一个错误还是有任何解决方案？