Roee Shlomo created ARROW-14271:
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Summary: [Java] Inconsistent logic for type IDs in Union vectors
Key: ARROW-14271
URL: https://issues.apache.org/jira/browse/ARROW-14271
Project: Apache Arrow
Issue Type: Bug
Components: Java
Affects Versions: 6.0.0
Reporter: Roee Shlomo
The current logic for calculating the type IDs in UnionVector#getField and
DenseUnionVector#getField is:
# DenseUnionVector uses an increasing counter
# UnionVector uses the ordinal of the type enum
# Both completely ignore the type IDs provided at construction as part of
fieldType (if provided)
We encountered this inconsistency while testing a direct roundtrip of a union
vector between pyarrow and Java with the C Data Interface ('direct' here means
without using VectorSchemaRoot/RecordBatch). The identifiers for the type IDs
differ after completing a roundtrip.
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