Gengliang Wang created SPARK-23896:
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Summary: Improve PartitioningAwareFileIndex
Key: SPARK-23896
URL: https://issues.apache.org/jira/browse/SPARK-23896
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.3.1
Reporter: Gengliang Wang
Currently `PartitioningAwareFileIndex` accepts an optional parameter
`userPartitionSchema`. If provided, it will combine the inferred partition
schema with the parameter.
However,
1. to get the inferred partition schema, we have to create a temporary file
index.
2. to get `userPartitionSchema`, we need to combine inferred partition schema
with `userSpecifiedSchema`
Only after that, a final version of `PartitioningAwareFileIndex` is created.
This can be improved by passing `userSpecifiedSchema` to
`PartitioningAwareFileIndex`.
With the improvement, we can reduce redundant code and avoid parsing the file
partition twice.
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