Dong Chen created HIVE-10252:
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Summary: Make PPD work for Parquet in row group level
Key: HIVE-10252
URL: https://issues.apache.org/jira/browse/HIVE-10252
Project: Hive
Issue Type: Sub-task
Reporter: Dong Chen
Assignee: Dong Chen
In Hive, predicate pushdown figures out the search condition in HQL, serialize
it, and push to file format. ORC could use the predicate to filter stripes.
Similarly, Parquet should use the statics saved in row group to filter not
match row group. But it does not work.
In {{ParquetRecordReaderWrapper}}, it get splits with all row groups (client
side), and push the filter to Parquet for further processing (parquet side).
But in {{ParquetRecordReader.initializeInternalReader()}}, if the splits have
already been selected by client side, it will not handle filter again.
We should make the behavior consistent in Hive. Maybe we could get splits,
filter them, and then pass to parquet. This means using client side strategy.
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