[jira] [Created] (SPARK-39480) Parquet bit-packing de/encode optimization

["Fang-Xie (Jira)" <ji...@apache.org>]

Fang-Xie created SPARK-39480:
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             Summary: Parquet bit-packing de/encode optimization
                 Key: SPARK-39480
                 URL: https://issues.apache.org/jira/browse/SPARK-39480
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.3.0
            Reporter: Fang-Xie
             Fix For: 3.3.0


Current Spark use Parquet-mr as parquet reader/writer library, but the built-in bit-packing en/decode is not efficient enough. 

Our optimization for Parquet bit-packing en/decode with jdk.incubator.vector in Open JDK18 brings prominent performance improvement.

Due to Vector API is added to OpenJDK since 16, So this optimization request JDK16 or higher.

*Below are our test results*

Functional test is based on open-source parquet-mr Bit-pack decoding function: *_public final void unpack8Values(final byte[] in, final int inPos, final int[] out, final int outPos)_* __ 

compared with our implementation with vector API *_public final void unpack8Values_vec(final byte[] in, final int inPos, final int[] out, final int outPos)_*

We tested 10 pairs (open source parquet bit unpacking vs ours optimized vectorized SIMD implementation) decode function with bit width=\{1,2,3,4,5,6,7,8,9,10}, below are test results:

 



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