viirya commented on a change in pull request #29812:
URL: https://github.com/apache/spark/pull/29812#discussion_r493073140
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/WithFields.scala
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@@ -17,16 +17,32 @@
package org.apache.spark.sql.catalyst.optimizer
-import org.apache.spark.sql.catalyst.expressions.WithFields
+import scala.collection.mutable
+
+import org.apache.spark.sql.catalyst.expressions.{Expression, WithFields}
import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
import org.apache.spark.sql.catalyst.rules.Rule
+import org.apache.spark.sql.internal.SQLConf
/**
- * Combines all adjacent [[WithFields]] expression into a single
[[WithFields]] expression.
+ * Optimizes [[WithFields]] expression chains.
*/
-object CombineWithFields extends Rule[LogicalPlan] {
+object OptimizeWithFields extends Rule[LogicalPlan] {
+ lazy val resolver = SQLConf.get.resolver
+
def apply(plan: LogicalPlan): LogicalPlan = plan transformAllExpressions {
+ case WithFields(structExpr, names, values) if names.distinct.length !=
names.length =>
+ val newNames = mutable.ArrayBuffer.empty[String]
+ val newValues = mutable.ArrayBuffer.empty[Expression]
+ names.zip(values).reverse.foreach { case (name, value) =>
+ if (newNames.find(resolver(_, name)).isEmpty) {
Review comment:
Added a set for case-sensitive case.
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