Xuwei Fu created PARQUET-2241:
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Summary: ByteStreamSplitDecoder broken in presence of nulls
Key: PARQUET-2241
URL: https://issues.apache.org/jira/browse/PARQUET-2241
Project: Parquet
Issue Type: Bug
Components: parquet-format
Affects Versions: format-2.8.0
Reporter: Xuwei Fu
Fix For: format-2.10.0
This problem is shown in this issue:
[https://github.com/apache/arrow/issues/15173|https://github.com/apache/arrow/issues/15173Let]
Let me talk about it briefly:
* Encoder doesn't write "num_values" on Page payload for BYTE_STREAM_SPLIT, but
using "num_values" as stride in BYTE_STREAM_SPLIT
* When decoding, for DATA_PAGE_V2, it can now the num_values and num_nulls in
the page, however, in DATA_PAGE_V1, without statistics, we should read
def-levels and rep-levels to get the real num-of-values. And without the
num-of-values, we aren't able to decode BYTE_STREAM_SPLIT correctly
The bug-reproducing code is in the issue.
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