Csaba Ringhofer created IMPALA-8381:
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Summary: Remove branch from ParquetPlainEncoder::Decode()
Key: IMPALA-8381
URL: https://issues.apache.org/jira/browse/IMPALA-8381
Project: IMPALA
Issue Type: Improvement
Components: Backend
Reporter: Csaba Ringhofer
Removing the "if" at
https://github.com/apache/impala/blob/5670f96b828d57f9e36510bb9af02bcc31de775c/be/src/exec/parquet/parquet-common.h#L203
can lead to 1.5x speed up in plain decoding (type=int32, stride=16). For
primitive types, the same check can be done for a whole batch, so the speedup
can be gained for large batches without loosing safety. The only Parquet type
where this check is needed per element is BYTE_ARRAY (typically used for STRING
columns), which already has a template specialization for
ParquetPlainEncoder::Decode().
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