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Commit b0985764 authored by Zheng RuiFeng's avatar Zheng RuiFeng Committed by Holden Karau
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[SPARK-14352][SQL] approxQuantile should support multi columns 

## What changes were proposed in this pull request?

1, add the multi-cols support based on current private api
2, add the multi-cols support to pyspark
## How was this patch tested?

unit tests

Author: Zheng RuiFeng <ruifengz@foxmail.com>
Author: Ruifeng Zheng <ruifengz@foxmail.com>

Closes #12135 from zhengruifeng/quantile4multicols.
parent c5fcb7f6
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