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https://issues.apache.org/jira/browse/PARQUET-425?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Liwei Lin updated PARQUET-425:
------------------------------
Description:
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:
+---+
| b|
+---+
+---+
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.
was:
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.
> 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:
> +---+
> | b|
> +---+
> +---+
> 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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