Github user rxin commented on the issue:
https://github.com/apache/spark/pull/15758
where's the assert?
```
private def getBucketSpec: Option[BucketSpec] = {
if (sortColumnNames.isDefined) {
require(numBuckets.isDefined, "sortBy must be used together with
bucketBy")
}
for {
n <- numBuckets
} yield {
require(n > 0 && n < 100000, "Bucket number must be greater than 0
and less than 100000.")
// partitionBy columns cannot be used in bucketBy
if (normalizedParCols.nonEmpty &&
normalizedBucketColNames.get.toSet.intersect(normalizedParCols.get.toSet).nonEmpty)
{
throw new AnalysisException(
s"bucketBy columns '${bucketColumnNames.get.mkString(", ")}'
should not be part of " +
s"partitionBy columns '${partitioningColumns.get.mkString(",
")}'")
}
BucketSpec(n, normalizedBucketColNames.get,
normalizedSortColNames.getOrElse(Nil))
}
}
```
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