Support nested AND
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sql
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Description
There might be nested AND cases:
a = b AND (c = d AND (e = f)).
Such cases should be flattened as a = b AND c = d AND e = f.
This is useful because after done so, we can easily build keys for join inputs: each conjunction clause contributes a field of key (key is Row in SQL equi-join) for join inputs.
Imported from Jira [BEAM-7150](https://issues.apache.org/jira/browse/BEAM-7150). Original Jira may contain additional context.
Reported by: amaliujia.
Subtask of issue #19175
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