[jira] [Commented] (SPARK-15678) Not use cache on appends and overwrites

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

    [ https://issues.apache.org/jira/browse/SPARK-15678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15321249#comment-15321249 ] 

Apache Spark commented on SPARK-15678:
--------------------------------------

User 'sameeragarwal' has created a pull request for this issue:
https://github.com/apache/spark/pull/13566

> Not use cache on appends and overwrites
> ---------------------------------------
>
>                 Key: SPARK-15678
>                 URL: https://issues.apache.org/jira/browse/SPARK-15678
>             Project: Spark
>          Issue Type: Bug
>    Affects Versions: 2.0.0
>            Reporter: Sameer Agarwal
>
> SparkSQL currently doesn't drop caches if the underlying data is overwritten.
> {code}
> val dir = "/tmp/test"
> sqlContext.range(1000).write.mode("overwrite").parquet(dir)
> val df = sqlContext.read.parquet(dir).cache()
> df.count() // outputs 1000
> sqlContext.range(10).write.mode("overwrite").parquet(dir)
> sqlContext.read.parquet(dir).count() // outputs 1000 instead of 10 <---- We are still using the cached dataset
> {code}



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