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From "Yuming Wang (Jira)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-31811) Pushdown IsNotNull to file scan if possible
Date Mon, 25 May 2020 08:40:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-31811?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yuming Wang reassigned SPARK-31811:
-----------------------------------

    Assignee:     (was: Yuming Wang)

> Pushdown IsNotNull to file scan if possible
> -------------------------------------------
>
>                 Key: SPARK-31811
>                 URL: https://issues.apache.org/jira/browse/SPARK-31811
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.1.0
>            Reporter: Yuming Wang
>            Priority: Major
>         Attachments: default.png, pushdown.png
>
>
> We should Pushdown {{IsNotNull}} to file scan if possible. For example:
> {code:sql}
> CREATE TABLE t1(c1 string, c2 string) USING parquet;
> EXPLAIN SELECT t1.* FROM t1 WHERE coalesce(t1.c1, t1.c2) IS NOT NULL;
> {code}
> {noformat}
> == Physical Plan ==
> *(1) Filter isnotnull(coalesce(c1#43, c2#44))
> +- *(1) ColumnarToRow
>    +- FileScan parquet default.t1[c1#43,c2#44] Batched: true, DataFilters: [isnotnull(coalesce(c1#43,
c2#44))], Format: Parquet, Location: InMemoryFileIndex[file:/root/spark-3.0.0-bin-hadoop2.7/spark-warehouse/t1],
PartitionFilters: [], PushedFilters: [], ReadSchema: struct<c1:string,c2:string>
> {noformat}
> {code:sql}
> EXPLAIN SELECT t1.* FROM t1 WHERE t1.c1 IS NOT NULL OR t1.c2 IS NOT NULL;
> {code}
> {noformat}
> == Physical Plan ==
> *(1) Filter (isnotnull(c1#43) OR isnotnull(c2#44))
> +- *(1) ColumnarToRow
>    +- FileScan parquet default.t1[c1#43,c2#44] Batched: true, DataFilters: [(isnotnull(c1#43)
OR isnotnull(c2#44))], Format: Parquet, Location: InMemoryFileIndex[file:/root/spark-3.0.0-bin-hadoop2.7/spark-warehouse/t1],
PartitionFilters: [], PushedFilters: [Or(IsNotNull(c1),IsNotNull(c2))], ReadSchema: struct<c1:string,c2:string>
> {noformat}
> Real performance test case:
>  !default.png!  !pushdown.png! 



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