tustvold opened a new pull request #378:
URL: https://github.com/apache/arrow-datafusion/pull/378
# Which issue does this PR close?
Closes #362
# Rationale for this change
Once an order preserving merge operator is added as part of #362 it will be
possible to combine multiple sorted partitions together into a single partition
- effectively yielding partitioned sort. Loosening the restriction on SortExec
to a single partition allows it to form the sort part of this.
# What changes are included in this PR?
SortExec is no longer restricted to a single partition, instead preserving
the partitioning of its inputs
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