Improve estimation of row count from partition samples #11333
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TPC benchmark results for partitioned sf1000 orc |
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Reduce the possiblity of estimation errors in averageRowsPerPartition and rowCount due to a couple of outliers by excluding the min and max rowCount values from the calculation of avg rows per partition.
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lgtm % mind automation |
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Test failure due to #11368 |
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Cherry-pick of trinodb/trino#11333 Co-authored-by: Raunaq Morarka <[email protected]>
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Reduce the possibility of estimation errors in averageRowsPerPartition and rowCount due to a couple of outliers by excluding the min and max rowCount values from the calculation of avg rows per partition. Cherry-pick of trinodb/trino#11333 Co-authored-by: Raunaq Morarka <[email protected]>
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Description
Reduce the possiblity of estimation errors in averageRowsPerPartition
and rowCount due to a couple of outliers by excluding the
min and max rowCount values from the calculation of
avg rows per partition.
improvement
hive connector statistics
improves estimates for partitioned hive tables
Documentation
(x) No documentation is needed.
( ) Sufficient documentation is included in this PR.
( ) Documentation PR is available with #prnumber.
( ) Documentation issue #issuenumber is filed, and can be handled later.
Release notes
(x) No release notes entries required.
( ) Release notes entries required with the following suggested text: