[jira] [Created] (PARQUET-425) Fix the bug when predicate contains columns not specified in prejection, to prevent filtering out data improperly

["Liwei Lin (JIRA)" <ji...@apache.org>]

Liwei Lin created PARQUET-425:
---------------------------------

             Summary: Fix the bug when predicate contains columns not specified in prejection, to prevent filtering out data improperly
                 Key: PARQUET-425
                 URL: https://issues.apache.org/jira/browse/PARQUET-425
             Project: Parquet
          Issue Type: Bug
          Components: parquet-mr
    Affects Versions: 1.8.0, 1.8.1
            Reporter: Liwei Lin
            Assignee: Liwei Lin
             Fix For: 1.9.0


As is reported in Parquet-427, data will be filtered out improperly under the case where:
1. requested schema ∩ predicates ≠ ∅
2. (requested schema ∪ predicates) - file schema ＝ ∅

To give an example:
data:
a: int	b: int
1	1
2	2
3	3
file schema: a,b, requested schema: a, and predicate: b = 1

we should get:
a: int
1
but we'll end up get nothing, which is wrong.



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