Juliusz Sompolski created SPARK-22957:
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Summary: ApproxQuantile breaks if the number of rows exceeds MaxInt
Key: SPARK-22957
URL: https://issues.apache.org/jira/browse/SPARK-22957
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.2.1
Reporter: Juliusz Sompolski
ApproxQuantile overflows when number of rows exceeds 2.147B (max int32).
If you run ApproxQuantile on a dataframe with 3B rows of 1 to 3B and ask it for
1/6 quantiles, it should return [0.5B, 1B, 1.5B, 2B, 2.5B, 3B]. However, in the
[implementation of
ApproxQuantile|https://github.com/apache/spark/blob/v2.2.0/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/QuantileSummaries.scala#L195],
it calls .toInt on the target rank, which overflows at 2.147B.
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