Volodymyr Vysotskyi created DRILL-7313:
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Summary: Use Hive schema for MaprDB native reader when field was
empty
Key: DRILL-7313
URL: https://issues.apache.org/jira/browse/DRILL-7313
Project: Apache Drill
Issue Type: Task
Affects Versions: 1.16.0
Reporter: Volodymyr Vysotskyi
Assignee: Volodymyr Vysotskyi
Fix For: 1.17.0
Currently, when an external Hive MaprDB table is queried using hive plugin with
enabled {{store.hive.maprdb_json.optimize_scan_with_native_reader}}, some
queries may fail due to soft schema change, though Hive knows actual data types.
For example, when we have a table with several fields, and one of them has only
several non-null values, queries with grouping by such field will fail due to
schema change.
The goal of this Jira is to allow using types from Hive when a non-existing
field is created, so it will allow avoiding such issues.
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