deniskuzZ opened a new pull request, #6711:
URL: https://github.com/apache/hive/pull/6711
Adds VirtualColumn.PARTITION_NAME, materialized by the Iceberg readers:
vectorized via HiveBatchIterator, row mode via PartitionInfo -> IOContext ->
MapOperator.
Refactors the read path to take everything the file already carries from the
scan task instead of the per-record constants map: spec id, partition hash,
file path, partition name, first row id and file sequence number are computed
once per task in both VirtualColumnAwareIterator and HiveBatchIterator. Drops
the now unread _partition column from the ACID read schema, along with the
write-only VIRTUAL_COLS_TO_META_COLS map and the per-record helpers it fed.
Fixes VectorizedParquetRecordReader taking a column type from the job column
list while indexing it with a batch column number: the two orders diverge past
the data columns because the batch drops virtual columns the readers cannot
fill.
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