Raghav Aggarwal created HIVE-30094:
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Summary: Use microsecond timestamp precision for Iceberg Z-ordering
Key: HIVE-30094
URL: https://issues.apache.org/jira/browse/HIVE-30094
Project: Hive
Issue Type: Bug
Reporter: Raghav Aggarwal
Assignee: Raghav Aggarwal
As per the [Iceberg Spec|https://iceberg.apache.org/spec/#primitive-types], the
{{timestamp}} and {{timestamptz}} primitive types are strictly represented as
integers using *microseconds* from the unix epoch.
However, Hive's ZOrder UDF ({{{}GenericUDFIcebergZorder{}}}) is truncating
timestamps to *milliseconds* when computing the Z-Order curve.
This can cause wrong grouping/clustering.
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