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Unverified Commit b7ac8fbd authored by Yiliang Qiu's avatar Yiliang Qiu Committed by GitHub
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Implement the low cardinality index (#5382) 

This PR is for Summer-2022 Implement the Low Cardinality HashMap project, and the project ID is 22fa00152.
This PR is implementing a low cardinality index, and will use it to optimize JOIN and GROUP BY.

The design documentation has been uploaded to https://github.com/matrixorigin/docs/blob/main/design/low_cardinality_design_doc.md



Co-authored-by: default avatarbRong Njam <longran1989@gmail.com>
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