guykhazma commented on a change in pull request #27112: [SPARK-30428][SQL] File
source V2: support partition pruning
URL: https://github.com/apache/spark/pull/27112#discussion_r364757217
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/FileScan.scala
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@@ -71,7 +103,7 @@ abstract class FileScan(
}
protected def partitions: Seq[FilePartition] = {
- val selectedPartitions = fileIndex.listFiles(Seq.empty, Seq.empty)
+ val selectedPartitions = fileIndex.listFiles(partitionFilters, Seq.empty)
Review comment:
@gengliangwang @cloud-fan continuing the discussion from above (the comment
was on the wrong line).
The `V2ScanRelationPushDown` rule will pushdown the `dataFilters` only to
datasources which support pushdown by implementing the
`SupportsPushDownFilters` trait.
Datasources such as `csv` and `json` do not implement the
`SupportsPushDownFilters` trait. In order to support data skipping uniformly
for all file based data sources, we override the `listFiles` method in a
FileIndex implementation, which consults external metadata and prunes the list
of files.
The suggestion is to make the necessary changes to have the `dataFilters`
passed to the `listFiles` as well.
Otherwise, one would have to create a new datasource implementation in order
to support each file based datasource that doesn't have a built in pushdown
mechanism.
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