taroplus commented on a change in pull request #33981:
URL: https://github.com/apache/spark/pull/33981#discussion_r707887231
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SchemaPruning.scala
##########
@@ -65,16 +67,19 @@ object SchemaPruning extends SQLConfHelper {
sortLeftFieldsByRight(leftValueType, rightValueType),
containsNull)
case (leftStruct: StructType, rightStruct: StructType) =>
- val resolver = conf.resolver
- val filteredRightFieldNames = rightStruct.fieldNames
- .filter(name => leftStruct.fieldNames.exists(resolver(_, name)))
- val sortedLeftFields = filteredRightFieldNames.map { fieldName =>
- val resolvedLeftStruct = leftStruct.find(p => resolver(p.name,
fieldName)).get
- val leftFieldType = resolvedLeftStruct.dataType
- val rightFieldType = rightStruct(fieldName).dataType
- val sortedLeftFieldType = sortLeftFieldsByRight(leftFieldType,
rightFieldType)
- StructField(fieldName, sortedLeftFieldType, nullable =
resolvedLeftStruct.nullable,
- metadata = resolvedLeftStruct.metadata)
+ val leftStructTreeMap =
Review comment:
based on my use-cases, often times left and right are the same thing,
can we have a condition like
```
case _ if left == right => left
```
i'm not sure if we need to recreate the whole thing for those situations
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