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Commit 2287f3d0 authored by wangzhenhua's avatar wangzhenhua Committed by Wenchen Fan
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[SPARK-20186][SQL] BroadcastHint should use child's stats 

## What changes were proposed in this pull request?

`BroadcastHint` should use child's statistics and set `isBroadcastable` to true.

## How was this patch tested?

Added a new stats estimation test for `BroadcastHint`.

Author: wangzhenhua <wangzhenhua@huawei.com>

Closes #17504 from wzhfy/broadcastHintEstimation.
parent 89d6822f
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