pitrou commented on code in PR #40987:
URL: https://github.com/apache/arrow/pull/40987#discussion_r1551750117
##########
java/vector/src/main/java/org/apache/arrow/vector/ipc/JsonFileWriter.java:
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@@ -208,6 +210,10 @@ private void writeBatch(VectorSchemaRoot recordBatch)
throws IOException {
}
private void writeFromVectorIntoJson(Field field, FieldVector vector) throws
IOException {
+ if (vector instanceof ExtensionTypeVector) {
Review Comment:
I'm curious why this is needed, because roundtripping works in our
integration tests:
https://github.com/apache/arrow/blob/b99b00dd66586cf54b04ce6a51eb1cf68b1510a3/dev/archery/archery/integration/datagen.py#L1845-L1861
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