simhadri-g opened a new pull request, #5048:
URL: https://github.com/apache/hive/pull/5048
…ed reads on partition columns
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Add
[HiveIdentityPartitionConverters.java](https://github.com/apache/hive/compare/master...simhadri-g:hive:HIVE-27938?expand=1#diff-ef270a84e5f54cdb0225c7cca328a2fc1dfb126fb593287c5b47d809d85633c7)
for converting partitions datatypes .
### Why are the changes needed?
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In this pull request https://github.com/apache/iceberg/pull/1130 -
Identity Partitioning: Introduced a iceberg specific constants map to convert
data from java internal representations (e.g., long for timestamps) to Iceberg
generics (LocalDateTime or OffsetDateTime for timestamps) .
A similar constants map is required for Hive as quoted in the following
discussion.
> When we add support for Pig or Hive objects, we would need to convert
differently for those.
> https://github.com/apache/iceberg/pull/1130#discussion_r443701477
Without this change, vectorised read queries on partition columns fail with
java.lang.ClassCastException for DATE, TIMESTAMP and DECIMAL datatypes as
described in the jira https://issues.apache.org/jira/browse/HIVE-27938 .
### Does this PR introduce _any_ user-facing change?
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Qfile :
[iceberg_partition_vectorized_read.q](https://github.com/apache/hive/compare/master...simhadri-g:hive:HIVE-27938?expand=1#diff-62f4a4032db78a040d7120035d69ef5d2420236c15b65dac89b6d6315185f1fd)
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