Liya Fan created ARROW-6911:
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Summary: [Java] Provide composite comparator
Key: ARROW-6911
URL: https://issues.apache.org/jira/browse/ARROW-6911
Project: Apache Arrow
Issue Type: New Feature
Components: Java
Reporter: Liya Fan
Assignee: Liya Fan
A composite comparator is a sub-class of VectorValueComparator that contains an
array of inner comparators, with each comparator corresponding to one column
for comparison. It can be used to support sort/comparison operations for
VectorSchemaRoot/StructVector.
The composite comparator works like this: it first uses the first internal
comparator (for the primary sort key) to compare vector values. If it gets a
non-zero value, we just return it; otherwise, we use the second comparator to
break the tie, and so on, until a non-zero value is produced by some internal
comparator, or all internal comparators have been used.
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