Dennis Huo created SPARK-40128:
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Summary: Add DELTA_LENGTH_BYTE_ARRAY as a recognized standalone
encoding in VectorizedColumnReader
Key: SPARK-40128
URL: https://issues.apache.org/jira/browse/SPARK-40128
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.3.0
Reporter: Dennis Huo
Even though https://issues.apache.org/jira/browse/SPARK-36879 added
implementations for DELTA_BINARY_PACKED, DELTA_BYTE_ARRAY, and
DELTA_LENGTH_BYTE_ARRAY encodings, only DELTA_BINARY_PACKED and
DELTA_BYTE_ARRAY were added as top-level standalone column encodings, with
DELTA_LENGTH_BYTE_ARRAY only being used in its capacity as a subcomponent of
DELTA_BYTE_ARRAY (for the non-shared string/binary suffixes).
Even though there apparently aren't many writers of the standalone
DELTA_LENGTH_BYTE_ARRAY encoding, it's part of the core Parquet spec:
https://parquet.apache.org/docs/file-format/data-pages/encodings/#delta-length-byte-array-delta_length_byte_array–6
and could be more efficient for types of binary/string data that don't take
good advantage of sharing common prefixes for incremental encoding.
The problem and be reproduced by trying to load one of the
[https://github.com/apache/parquet-testing] files
(delta_length_byte_array.parquet).
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