[jira] [Commented] (SPARK-10334) Partitioned table scan's query plan does not show Filter and Project on top of the table scan

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-10334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14720749#comment-14720749 ] 

Apache Spark commented on SPARK-10334:
--------------------------------------

User 'yhuai' has created a pull request for this issue:
https://github.com/apache/spark/pull/8515

> Partitioned table scan's query plan does not show Filter and Project on top of the table scan
> ---------------------------------------------------------------------------------------------
>
>                 Key: SPARK-10334
>                 URL: https://issues.apache.org/jira/browse/SPARK-10334
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.5.0
>            Reporter: Yin Huai
>            Assignee: Yin Huai
>            Priority: Critical
>
> {code}
> Seq(Tuple2(1, 1), Tuple2(2, 2)).toDF("i", "j").write.format("parquet").partitionBy("i").save("/tmp/testFilter_partitioned")
> val df1 = sqlContext.read.format("parquet").load("/tmp/testFilter_partitioned")
> df1.selectExpr("hash(i)", "hash(j)").show
> df1.filter("hash(j) = 1").explain
> == Physical Plan ==
> Scan ParquetRelation[file:/tmp/testFilter_partitioned][j#20,i#21]
> {code}
> Looks like the reason is that we correctly apply the project and filter. Then, we create an RDD for the result and then manually create a PhysicalRDD. So, the Project and Filter on top of the original table scan disappears from the physical  plan.
> See https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceStrategy.scala#L138-L175
> We will not generate wrong result. But, the query plan is confusing.



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