dongjoon-hyun commented on a change in pull request #23280: [MINOR][SQL] Some
errors in the notes.
URL: https://github.com/apache/spark/pull/23280#discussion_r240471322
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/package.scala
##########
@@ -101,7 +101,7 @@ package object expressions {
StructType(attrs.map(a => StructField(a.name, a.dataType, a.nullable,
a.metadata)))
}
- // It's possible that `attrs` is a linked list, which can lead to bad
O(n^2) loops when
Review comment:
Could you tell us why you think this comment is error? This comments came
from [SPARK-15764 Replace N^2 loop in
BindReferences](https://github.com/apache/spark/pull/13505) to explain the
problamatic situation.
> When using ordinals to access linked list, the time cost is O(n).
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