Gengliang Wang created SPARK-27698:
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Summary: Add new method for getting pushed down filters in Parquet
file reader
Key: SPARK-27698
URL: https://issues.apache.org/jira/browse/SPARK-27698
Project: Spark
Issue Type: Task
Components: SQL
Affects Versions: 3.0.0
Reporter: Gengliang Wang
To return accurate pushed filters in Parquet file
scan(https://github.com/apache/spark/pull/24327#pullrequestreview-234775673),
we can process the original data source filters in the following way:
1. For "And" operators, split the conjunctive predicates and try converting
each of them. After that
:
1.1 if partially predicate pushed down is allowed, return convertible results;
1.2 otherwise, return the whole predicate if convertible, or empty result if
not convertible.
2. For other operators, it is either entirely pushed down, or not pushed down.
In the current push down strategy, the "Non-And" operators are not able to be
partially pushed down.
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