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                                            HongShen

Optimize operator's performance when vector has low selectivity

1. We have implemented "merge multiple vectors into one vector". If necessary, we can submit the a PR. 2. "Decide a mechanism to when to apply this merging", Presto MergingPageOutput.producePositionCountOnlyOutput...

Optimize operator's performance when vector has low selectivity

In addition, we can also contribute benchmark for this optimization.

Optimize operator's performance when vector has low selectivity

@mbasmanova Ok, I will submit a PR first.