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

["Ryan Blue (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PARQUET-425?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ryan Blue updated PARQUET-425:
------------------------------
    Fix Version/s:     (was: 1.9.0)

> 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(Inactive)
>            Assignee: Liwei Lin(Inactive)
>
> As is reported in Parquet-427, data will be filtered out improperly under the case where:
> 1. predicates - requested schema ≠ ∅
> 2. predicates - file schema ＝ ∅
> To give an example:
> data:
> |a|b|
> |1|1|
> |2|2|
> |3|3|
> file schema: a,b, requested schema: a, and predicate: b = 1
> we should get:
> |a|
> |1|
> but we'll end up get nothing, which is wrong.
> This issue proposes to fix this.



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