planner: push Limit/TopN through IndexMerge

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#36,808 opened on Aug 2, 2022 6 comments 0 reactions 2 assignees Claimed by @winoros View on GitHub

report/customer sig/planner type/enhancement

Description

v6.1.0
Does indexmerge support limit_to_cop?

![M9D1HwzFIe](https://user-images.githubusercontent.com/21033020/182321825-788b797c-8eba-4ec1-9926-83d5926f1974.jpg)

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