[jira] [Created] (SPARK-21969) CommandUtils.updateTableStats should call refreshTable

["Bogdan Raducanu (JIRA)" <ji...@apache.org>]

Bogdan Raducanu created SPARK-21969:
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             Summary: 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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