Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/12750#discussion_r61666400
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala ---
@@ -103,6 +103,17 @@ case class StructType(fields: Array[StructField])
extends DataType with Seq[Stru
private lazy val nameToField: Map[String, StructField] = fields.map(f =>
f.name -> f).toMap
private lazy val nameToIndex: Map[String, Int] =
fieldNames.zipWithIndex.toMap
+ override def equals(that: Any): Boolean = {
--- End diff --
The old `StructType.equals()` was inherited from `Seq` and was fairly slow.
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