[SPARK-37076] Implement StructType.toString explicitly for Scala 2.13

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.3.0
• Fix Version/s: 3.3.0
• Component/s: SQL
• Assignee: Kousuke Saruta
• Reporter: Kousuke Saruta
• Created: 20/Oct/21 17:53
• Updated: 12/Dec/22 18:11
• Resolved: 21/Oct/21 04:49

Description

The string returned by StructType.toString is different between Scala 2.12 and 2.13.

• Scala 2.12

  val st = StructType(StructField("a", IntegerType) :: Nil)
  st.toString
  res0: String = StructType(StructField(a,IntegerType,true)
  

• Scala 2.13

  val st = StructType(StructField("a", IntegerType) :: Nil)
  st.toString
  val res0: String = Seq(StructField(a,IntegerType,true))
  

It's because the logic to make the prefix of the string was changed from Scala 2.13.

Scala 2.12: https://github.com/scala/scala/blob/v2.12.15/src/library/scala/collection/TraversableLike.scala#L804
Scala 2:13:https://github.com/scala/scala/blob/v2.13.5/src/library/scala/collection/Seq.scala#L46

Issue Links

• links to: [Github] Pull Request #34341 (sarutak)