Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/18600#discussion_r126876170 --- 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 -- The target of this cleanup PR is to remove the metadata...
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