Github user jinxing64 commented on the issue:
https://github.com/apache/spark/pull/18866
In current change:
1. `ClusteredDistribution` becomes ClusteredDistribution(clustering:
Seq[Expression], clustersOpt: Option[Int] = None, useHiveHash: Boolean =
false)` -- a) number and clusters can be specified, b) `useHiveHash` indicates
whether Hive hash should be used for partitioning.
2. `InsertIntoHiveTable` requires distribution
`ClusteredDistribution(partitionAttributes ++ bucketColumns,
Option(bucketSpec.numBuckets), useHiveHash = true)`. Thus to make sure one
bucket has only one file.
3. Partition id is not shown in name of bucket file, thus only bucket id
decides the order of bucket file names.
4. Write an empty file for empty bucket file.
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