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Commit 0f5f52a3 authored by jiangxingbo's avatar jiangxingbo Committed by Herman van Hovell
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[SPARK-16282][SQL] Implement percentile SQL function.

## What changes were proposed in this pull request?

Implement percentile SQL function. It computes the exact percentile(s) of expr at pc with range in [0, 1].

## How was this patch tested?

Add a new testsuite `PercentileSuite` to test percentile directly.
Updated related testcases in `ExpressionToSQLSuite`.

Author: jiangxingbo <jiangxb1987@gmail.com>
Author: 蒋星博 <jiangxingbo@meituan.com>
Author: jiangxingbo <jiangxingbo@meituan.com>

Closes #14136 from jiangxb1987/percentile.
parent 18564284
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