davisusanibar commented on issue #34850:
URL: https://github.com/apache/arrow/issues/34850#issuecomment-1496273772
> I figured out what was causing it. Appears that adding explicit
`compression='uncompressed'` on python export side will result in correct
processing. Does `ArrowFileReader` support compression which is turned on by
default on Python side?
Hi @tklinchik , use CommonsCompressionFactory for compressed files (Lz4/Zstd
currently supported)
```
File file = new File("lz4.arrow");
try (
BufferAllocator rootAllocator = new RootAllocator();
FileInputStream fileInputStream = new FileInputStream(file);
// ArrowFileReader reader = new
ArrowFileReader(fileInputStream.getChannel(), rootAllocator) // Use
CommonsCompressionFactory for compressed files
ArrowFileReader reader = new
ArrowFileReader(fileInputStream.getChannel(),
rootAllocator, CommonsCompressionFactory.INSTANCE)
) {
System.out.println("Record batches in file: " +
reader.getRecordBlocks().size());
for (ArrowBlock arrowBlock : reader.getRecordBlocks()) {
reader.loadRecordBatch(arrowBlock);
VectorSchemaRoot vectorSchemaRootRecover =
reader.getVectorSchemaRoot();
System.out.println("Size: --> " +
vectorSchemaRootRecover.getRowCount());
System.out.print(vectorSchemaRootRecover.contentToTSVString());
}
} catch (IOException e) {
e.printStackTrace();
}
```
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