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Choose whether to use WindowOperator or TopNRowNumberOperator based on stats #5319

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sopel39 opened this issue Sep 28, 2020 · 1 comment
Closed

Choose whether to use WindowOperator or TopNRowNumberOperator based on stats #5319

sopel39 opened this issue Sep 28, 2020 · 1 comment

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sopel39 commented Sep 28, 2020 •
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TopNRowNumberOperator is very memory inefficient when most of the groups are singletons or contain just few rows. In such case it's better to use WindowOprator. Behavior which operator to use is determined by optimize_top_n_row_number toggle. We could add optimize_top_n_row_number=AUTO option which would trigger usage of CBO to determine whether to use TopNRowNumberOperator or WindowOprator
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sopel39 commented Feb 5, 2021

This is no longer relevant after #6333

@sopel39 sopel39 closed this as completed Feb 5, 2021
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