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Which issue does this PR close?

Closes #1246

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What changes are included in this PR?

Are there any user-facing changes?

@alamb alamb merged commit 3626ded into apache:master Nov 5, 2021
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alamb commented Nov 5, 2021

Thanks @xudong963

@xudong963 xudong963 deleted the update_roadmap branch November 6, 2021 01:48
@houqp houqp added the development-process Related to development process of DataFusion label Nov 6, 2021
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group by high cardinality column in datafusion 10 times slower than low cardinality column

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