manuzhang commented on PR #37074:
URL: https://github.com/apache/spark/pull/37074#issuecomment-1177067204
`RewritePredicateSubquery` checks for duplicated attributes in the outputSet
of outerPlan and subPlan. In this case, after `ColumnPruning`, the outputSet of
outerPlan is `a#250, a#266, b#251, c#268` and that of subPlan is `1#273, a#266,
b#267, c#268#277`.
```
Project [a#250, b#251, c#268]
+- Filter NOT exists#272 [(a#250 = a#266) && (b#251 = b#267) && (c#268
= c#268#277)]
: +- Project [1 AS 1#273, _1#259 AS a#266, _2#260 AS b#267, _3#261 AS
c#268#277]
: +- LocalRelation [_1#259, _2#260, _3#261]
+- Join Inner, (a#250 = a#266)
:- Project [a#250, b#251]
: +- Project [_1#243 AS a#250, _2#244 AS b#251]
: +- LocalRelation [_1#243, _2#244, _3#245]
+- Project [a#266, c#268]
+- Project [_1#259 AS a#266, _3#261 AS c#268]
+- LocalRelation [_1#259, _2#260, _3#261]
```
Anyway, `removeProjectBeforeFilter` intends to remove `Project` added by
`ColumnPruning`, which is the not case here. I'm not sure whether there is a
easy way to differentiate generally.
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