Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18600#discussion_r126870212
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceStrategy.scala
---
@@ -354,36 +352,10 @@ case class DataSourceStrategy(conf: SQLConf) extends
Strategy with Logging with
val (unhandledPredicates, pushedFilters, handledFilters) =
selectFilters(relation.relation, candidatePredicates)
- // A set of column attributes that are only referenced by pushed down
filters. We can eliminate
- // them from requested columns.
- val handledSet = {
- val handledPredicates =
filterPredicates.filterNot(unhandledPredicates.contains)
- val unhandledSet =
AttributeSet(unhandledPredicates.flatMap(_.references))
- AttributeSet(handledPredicates.flatMap(_.references)) --
- (projectSet ++ unhandledSet).map(relation.attributeMap)
- }
-
// Combines all Catalyst filter `Expression`s that are either not
convertible to data source
// `Filter`s or cannot be handled by `relation`.
val filterCondition =
unhandledPredicates.reduceLeftOption(expressions.And)
- // These metadata values make scan plans uniquely identifiable for
equality checking.
- // TODO(SPARK-17701) using strings for equality checking is brittle
- val metadata: Map[String, String] = {
--- End diff --
We need to keep it.
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