maropu commented on a change in pull request #28898:
URL: https://github.com/apache/spark/pull/28898#discussion_r448692070
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasing.scala
##########
@@ -176,9 +192,16 @@ object NestedColumnAliasing {
// By default, ColumnPruning rule uses `attr` already.
if (nestedFieldToAlias.nonEmpty &&
nestedFieldToAlias
- .map { case (nestedField, _) =>
totalFieldNum(nestedField.dataType) }
- .sum < totalFieldNum(attr.dataType)) {
- Some(attr.exprId -> nestedFieldToAlias)
+ .foldLeft(Seq[ExtractValue]()) {
+ (unique, curr) => if
(!unique.exists(curr._1.semanticEquals(_))) {
+ curr._1 +: unique
+ } else {
+ unique
+ }
+ }
+ .map { t => totalFieldNum(t.dataType) }
+ .sum < totalFieldNum(attr._2)) {
Review comment:
I think Its hard to read this part. Could you pull the left value out
from the `if` condition?
```
val xxx = yyy
if (xxx < totalFieldNum(attr._2)) { ...
```
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