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From "Amit (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-25185) CBO rowcount statistics doesn't work for partitioned parquet external table
Date Wed, 31 Jul 2019 16:31:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-25185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16897305#comment-16897305
] 

Amit commented on SPARK-25185:
------------------------------

Yes it seems to work, but with lot of caveats.. like the one above up until 2.3 not sure of
2.4 though

> CBO rowcount statistics doesn't work for partitioned parquet external table
> ---------------------------------------------------------------------------
>
>                 Key: SPARK-25185
>                 URL: https://issues.apache.org/jira/browse/SPARK-25185
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Spark Core, SQL
>    Affects Versions: 2.2.1, 2.3.0
>         Environment:  
> Tried on Ubuntu, FreBSD and windows, running spark-shell in local mode reading data from
local file system
>            Reporter: Amit
>            Priority: Major
>
> Created a dummy partitioned data with partition column on string type col1=a and col1=b
> added csv data-> read through spark -> created partitioned external table->
msck repair table to load partition. Did analyze on all columns and partition column as well.
> ~println(spark.sql("select * from test_p where e='1a'").queryExecution.toStringWithStats)~
>  ~val op = spark.sql("select * from test_p where e='1a'").queryExecution.optimizedPlan~
> // e is the partitioned column
>  ~val stat = op.stats(spark.sessionState.conf)~
>  ~print(stat.rowCount)~
>  
> Created the same way in parquet the rowcount comes up correctly in case of csv but in
parquet it shows as None.



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