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  1. Apache Arrow
  2. ARROW-6911

[Java] Provide composite comparator

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Details

    • New Feature
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • None
    • 0.16.0
    • Java

    Description

      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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