用bigquery计算数组长度 returns 1 空的时候

Question

我有如下文本字符串：

text_string    
"1","4","9","8","12","10","7","13","15","5","14"

然后我需要统计成员的数量。因此，为此我使用了以下函数：

ARRAY_LENGTH(SPLIT(text_string,","))    which returns 11 and it is fine.

但是当text_string为空时，它总是returns 1.

我该如何解决这个问题？

Answer 1

SPLIT documentation 说，

Splitting an empty STRING returns an ARRAY with a single empty STRING.

我不太确定，但你不能做类似的事情吗，

IF(text_string = "", 0, ARRAY_LENGTH(SPLIT(text_string,",")))

Count the length of an array with bigquery returns 1 when empty