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https://issues.apache.org/jira/browse/HIVE-25568?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Krisztian Kasa updated HIVE-25568:
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Description:
Currently TopNKey operator has the same statistics as it's parent operator:
{code}
TableScan
alias: src
Statistics: Num rows: 500 Data size: 89000 Basic stats: COMPLETE Column
stats: COMPLETE
Top N Key Operator
sort order: +
keys: key (type: string)
null sort order: z
Statistics: Num rows: 500 Data size: 89000 Basic stats: COMPLETE Column
stats: COMPLETE
top n: 5
{code}
This operator filters out rows and this should be indicated in statistics.
was:
Currently TopNKey operator has the same statistics as it's parent operator:
{code}
TableScan
alias: src
Statistics: Num rows: 500 Data size: 89000 Basic stats:
COMPLETE Column stats: COMPLETE
Top N Key Operator
sort order: +
keys: key (type: string)
null sort order: z
Statistics: Num rows: 500 Data size: 89000 Basic stats:
COMPLETE Column stats: COMPLETE
top n: 5
{code}
This operator filters out rows and this should be indicated in statistics.
> Estimate TopNKey operator statistics.
> -------------------------------------
>
> Key: HIVE-25568
> URL: https://issues.apache.org/jira/browse/HIVE-25568
> Project: Hive
> Issue Type: Improvement
> Reporter: Krisztian Kasa
> Priority: Major
>
> Currently TopNKey operator has the same statistics as it's parent operator:
> {code}
> TableScan
> alias: src
> Statistics: Num rows: 500 Data size: 89000 Basic stats: COMPLETE Column
> stats: COMPLETE
> Top N Key Operator
> sort order: +
> keys: key (type: string)
> null sort order: z
> Statistics: Num rows: 500 Data size: 89000 Basic stats: COMPLETE Column
> stats: COMPLETE
> top n: 5
> {code}
> This operator filters out rows and this should be indicated in statistics.
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