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  1. Apache Arrow
  2. ARROW-6040

[Java] Dictionary entries are required in IPC streams even when empty

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      Java's ArrowReader requires that dictionaries are sent in an IPC stream: https://github.com/apache/arrow/blob/master/java/vector/src/main/java/org/apache/arrow/vector/ipc/ArrowReader.java#L196-L200.

      However, as noted in ARROW-6006, that is not required if the stream contains no values.

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              tianchen92 Ji Liu
              sfackler Steven Fackler
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