HongShen

[CALCITE-3298] Add getSelectivity for TableScan in RelMdSelectivity

7

As illustrated in https://issues.apache.org/jira/browse/CALCITE-3298, Add getSelectivity for TableScan in RelMdSelectivity.

[window] Optimization aggregation window by segment tree

8

This optimization is based on https://www.vldb.org/pvldb/vol8/p1058-leis.pdf paper and is similar to https://duckdb.org/2021/10/13/windowing.html 1. Description * When the window frame size is relatively large, such as window frame size >= 16,...

Optimize operator's performance when vector has low selectivity

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### Description When we tested the performance of velox, in most cases the HashAggregation performance of velox was much faster than that of presto, but we found that it was...