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Posted to dev@hive.apache.org by "Alessandro Solimando (Jira)" <ji...@apache.org> on 2022/09/28 16:40:00 UTC

[jira] [Created] (HIVE-26572) Support constant expressions in vectorized expressions

Alessandro Solimando created HIVE-26572:
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             Summary: Support constant expressions in vectorized expressions
                 Key: HIVE-26572
                 URL: https://issues.apache.org/jira/browse/HIVE-26572
             Project: Hive
          Issue Type: Improvement
          Components: Vectorization
    Affects Versions: 4.0.0-alpha-2
            Reporter: Alessandro Solimando


At the moment, we cannot vectorize aggregate expression having constant parameters in addition to the aggregation column (it's forbidden [here|https://github.com/apache/hive/blob/c19d56ec7429bfcfad92b62ac335dbf8177dab24/ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/Vectorizer.java#L4531]).

One compelling example of how this could help is [PR 1824|https://github.com/apache/hive/pull/1824], linked to HIVE-24510, where _compute_bit_vector_ had to be split into _compute_bit_vector_hll_ + _compute_bit_vector_fm_ when HLL implementation has been added, while _compute_bit_vector($col, ['HLL'|'FM'])_ could have been used.



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