Wes McKinney created ARROW-400:

             Summary: [Java] ArrowWriter writes length 0 for Struct types
                 Key: ARROW-400
                 URL: https://issues.apache.org/jira/browse/ARROW-400
             Project: Apache Arrow
          Issue Type: Bug
          Components: Java - Vectors
            Reporter: Wes McKinney
            Priority: Blocker

Observed in integration testing. In a length-7 struct, the field metadata for 
the struct node has length 0 in the flatbuffer. From C++ gdb:

(gdb) p field_meta
$1 = {length = 0, null_count = 0}

See attached example json file

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