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https://issues.apache.org/jira/browse/SPARK-21969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16168901#comment-16168901
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Apache Spark commented on SPARK-21969:
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User 'aokolnychyi' has created a pull request for this issue:
https://github.com/apache/spark/pull/19252
> CommandUtils.updateTableStats should call refreshTable
> ------------------------------------------------------
>
> Key: SPARK-21969
> URL: https://issues.apache.org/jira/browse/SPARK-21969
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Bogdan Raducanu
>
> The table is cached so even though statistics are removed, they will still be
> used by the existing sessions.
> {code}
> spark.range(100).write.saveAsTable("tab1")
> sql("analyze table tab1 compute statistics")
> sql("explain cost select distinct * from tab1").show(false)
> {code}
> Produces:
> {code}
> Relation[id#103L] parquet, Statistics(sizeInBytes=784.0 B, rowCount=100,
> hints=none)
> {code}
> {code}
> spark.range(100).write.mode("append").saveAsTable("tab1")
> sql("explain cost select distinct * from tab1").show(false)
> {code}
> After append something, the same stats are used
> {code}
> Relation[id#135L] parquet, Statistics(sizeInBytes=784.0 B, rowCount=100,
> hints=none)
> {code}
> Manually refreshing the table removes the stats
> {code}
> spark.sessionState.catalog.refreshTable(TableIdentifier("tab1"))
> sql("explain cost select distinct * from tab1").show(false)
> {code}
> {code}
> Relation[id#155L] parquet, Statistics(sizeInBytes=1568.0 B, hints=none)
> {code}
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