zhengruifeng created SPARK-14352:
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Summary: approxQuantile should support multi columns
Key: SPARK-14352
URL: https://issues.apache.org/jira/browse/SPARK-14352
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: zhengruifeng
It will be convenient and efficient to calculate quantiles of multi-columns
with approxQuantile.
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