Liya Fan created ARROW-6911: ------------------------------- 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. -- This message was sent by Atlassian Jira (v8.3.4#803005)