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