Krisztian Kasa created HIVE-25568:
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Summary: Estimate TopNKey operator statistics.
Key: HIVE-25568
URL: https://issues.apache.org/jira/browse/HIVE-25568
Project: Hive
Issue Type: Improvement
Reporter: Krisztian Kasa
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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