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  1. IMPALA
  2. IMPALA-4177

Add batch dictionary/RLE decoding in Parquet

    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: Impala 2.8.0
    • Fix Version/s: Impala 2.11.0
    • Component/s: Backend
    • Labels:

      Description

      parquet-cpp implemented this optimisation here: https://github.com/apache/parquet-cpp/pull/140/commits/3f10378c5fc56c346ce77bf9e9faf011ead9c5e6

      The basic idea is to add a batched interface to DictDecoder and RleDecoder, and support passing in a dictionary to RleDecoder. It should then be possible to significantly optimise the decoding.

      We should add a microbenchmark for DictDecoder. and updated the benchmark for RleDecoder so we can understand the perf.

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              • Assignee:
                tarmstrong Tim Armstrong
                Reporter:
                tarmstrong Tim Armstrong
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                • Created:
                  Updated:
                  Resolved: