Rajesh Balamohan created HIVE-26913:
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Summary: HiveVectorizedReader::parquetRecordReader should reuse
footer information
Key: HIVE-26913
URL: https://issues.apache.org/jira/browse/HIVE-26913
Project: Hive
Issue Type: Improvement
Components: Iceberg integration
Reporter: Rajesh Balamohan
HiveVectorizedReader::parquetRecordReader should reuse details of parquet
footer, instead of reading it again.
It reads parquet footer here:
[https://github.com/apache/hive/blob/master/iceberg/iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/vector/HiveVectorizedReader.java#L230-L232]
Again it reads the footer here for constructing vectorized recordreader
[https://github.com/apache/hive/blob/master/iceberg/iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/vector/HiveVectorizedReader.java#L249]
[https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/io/parquet/VectorizedParquetInputFormat.java#L50]
Check the codepath of
VectorizedParquetRecordReader::setupMetadataAndParquetSplit
[https://github.com/apache/hive/blob/6b0139188aba6a95808c8d1bec63a651ec9e4bdc/ql/src/java/org/apache/hadoop/hive/ql/io/parquet/vector/VectorizedParquetRecordReader.java#L180]
It should be possible to share "ParquetMetadata" in
VectorizedParuqetRecordReader.
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