amaliujia commented on pull request #11967:
URL: https://github.com/apache/beam/pull/11967#issuecomment-655707048
@darshanj
I believe your implementation will break this query (at least from ZetaSQL
dialect path)
```
SELECT DISTINCT val.BYTES
from (select b"1" BYTES union all
select cast(NULL as bytes) union all
select b"-1" union all
select b"1" union all
select cast(NULL as bytes)) val
```
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