peter-toth commented on code in PR #54459:
URL: https://github.com/apache/spark/pull/54459#discussion_r2895028233
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sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/PushDownUtils.scala:
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@@ -96,18 +149,55 @@ object PushDownUtils {
}
}
- // Data source filters that need to be evaluated again after scanning.
which means
- // the data source cannot guarantee the rows returned can pass these
filters.
- // As a result we must return it so Spark can plan an extra filter
operator.
- val postScanFilters = r.pushPredicates(translatedFilters.toArray).map
{ predicate =>
- DataSourceV2Strategy.rebuildExpressionFromFilter(predicate,
translatedFilterToExpr)
+ // Post-scan filters candidates: those the data source rejected in the
first pass
+ // and need to be evaluated by Spark after the scan.
+ val returnedFirstPassFilters =
r.pushPredicates(translatedFilters.toArray).map {
+ predicate =>
+ DataSourceV2Strategy.rebuildExpressionFromFilter(predicate,
translatedFilterToExpr)
+ }
+
+ val finalPostScanFilters = (partitionSchema,
r.supportsEnhancedPartitionFiltering()) match {
+ // If the scan supports enhanced partition filtering, convert to
PartitionPredicates
+ // (see SPARK-55596). PartitionPredicates are pushed to the scan in
a second pass.
+ case (Some(structType), true) =>
+ //
+ val (postScanPartitionFilters, postScanDataFilters) =
+ DataSourceUtils.getPartitionFiltersAndDataFilters(
+ structType, returnedFirstPassFilters.toIndexedSeq)
+ val (untranslatablePartitionFilters, untranslatableDataFilters) =
+ DataSourceUtils.getPartitionFiltersAndDataFilters(
+ structType, untranslatableExprs.toSeq)
+
+ // Push second-pass partition filters as PartitionPredicates
+ val allPartitionPredicates = (postScanPartitionFilters ++
+ untranslatablePartitionFilters)
+ .map(expr => new PartitionPredicateImpl(expr,
toAttributes(structType)))
+ val returnedSecondPassPartitionFilters =
+ r.pushPredicates(allPartitionPredicates.toArray).map { predicate
=>
+ V2ExpressionUtils.toCatalyst(predicate).getOrElse(
+ DataSourceV2Strategy.rebuildExpressionFromFilter(
+ predicate, translatedFilterToExpr))
+ }
+
+ // Normally translated filters (postScanFilters) are simple
filters that can be
+ // evaluated faster, while the untranslated filters are
complicated filters that take
+ // more time to evaluate, so we want to evaluate the
postScanFilters filters first.
+ val untranslatableSet = ExpressionSet(untranslatableExprs)
+ val returnedPostScanPartitionFilters =
+ returnedSecondPassPartitionFilters.filter(e =>
!untranslatableSet.contains(e))
+ val returnedUntranslatablePartitionFilters =
+
returnedSecondPassPartitionFilters.filter(untranslatableSet.contains)
+ val postScanFilters = postScanDataFilters ++
returnedPostScanPartitionFilters ++
+ untranslatableDataFilters ++
returnedUntranslatablePartitionFilters
+ postScanFilters.toArray.toImmutableArraySeq
Review Comment:
`.toArray.toImmutableArraySeq` seems unecessary.
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