IN/NOT IN List: NULL is not equal to NULL

[liukun4515]

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This #2156 introduce an optimization for checking value in/not in the list.

But it ignore the NULL case.

In the SQL system, NULL is not equal to NULL.

Like below case:

select 1 in (2,3,4,5,......100, null)  return null

But now It will return false.

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