feat(datafusion): Add sort_by_partition to sort the input partitioned data
#1618
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IcebergPartitionSortExec to sort data for partitioned tablesort_by_partition to sort the input partitioned data
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Which issue does this PR close?
What changes are included in this PR?
sort_by_partitionto sort the repartitioned data by Iceberg partition values to allow a non-fanout writer able to write all the data from a DataFusion partition.SortExecusingLexOrderingof the projected partition column valueIcebergTableProvider::insert_into, it should be done after Make fanout/clustered mode configurable for datafusion write #1834 is addressed: We should sort when user is using clustered writing mode and the data is projected/partitionedAre these changes tested?
Added UTs