[GitHub] [spark] turboFei opened a new pull request #24992: [SPARK-28194][SQL] Refactor code to prevent None.get

[GitBox <gi...@apache.org>]

turboFei opened a new pull request #24992: [SPARK-28194][SQL] Refactor code to prevent None.get
URL: https://github.com/apache/spark/pull/24992
 
 
   ## What changes were proposed in this pull request?
   We have meet a NoSuchElementException during the phase of EnsureRequirement.
   ```
   java.util.NoSuchElementException: None.get
   	at scala.None$.get(Option.scala:347)
   	at scala.None$.get(Option.scala:345)
   	at org.apache.spark.sql.execution.exchange.EnsureRequirements$$anonfun$reorder$1.apply(EnsureRequirements.scala:239)
   	at org.apache.spark.sql.execution.exchange.EnsureRequirements$$anonfun$reorder$1.apply(EnsureRequirements.scala:234)
   	at scala.collection.immutable.List.foreach(List.scala:381)
   	at org.apache.spark.sql.execution.exchange.EnsureRequirements.reorder(EnsureRequirements.scala:234)
   	at org.apache.spark.sql.execution.exchange.EnsureRequirements.reorderJoinKeys(EnsureRequirements.scala:257)
   	at org.apache.spark.sql.execution.exchange.EnsureRequirements.org$apache$spark$sql$execution$exchange$EnsureRequirements$$reorderJoinPredicates(EnsureRequirements.scala:297)
   	at org.apache.spark.sql.execution.exchange.EnsureRequirements$$anonfun$apply$1.applyOrElse(EnsureRequirements.scala:312)
   	at org.apache.spark.sql.execution.exchange.EnsureRequirements$$anonfun$apply$1.applyOrElse(EnsureRequirements.scala:304)
   	at org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$transformUp$2.apply(TreeNode.scala:293)
   	at org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$transformUp$2.apply(TreeNode.scala:293)
   	at org.apache.spark.sql.catalyst.trees.CurrentOrigin$.withOrigin(TreeNode.scala:70)
   	at org.apache.spark.sql.catalyst.trees.TreeNode.transformUp(TreeNode.scala:292)
   	at org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$3.apply(TreeNode.scala:286)
   	at org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$3.apply(TreeNode.scala:286)
   	at org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$4.apply(TreeNode.scala:306)
   	at org.apache.spark.sql.catalyst.trees.TreeNode.mapProductIterator(TreeNode.scala:187)
   	at org.apache.spark.sql.catalyst.trees.TreeNode.mapChildren(TreeNode.scala:304)
   	at org.apache.spark.sql.catalyst.trees.TreeNode.transformUp(TreeNode.scala:286)
   	at org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$3.apply(TreeNode.scala:286)
   	at org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$3.apply(TreeNode.scala:286)
   	at org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$4.apply(TreeNode.scala:306)
   	at org.apache.spark.sql.catalyst.trees.TreeNode.mapProductIterator(TreeNode.scala:187)
   	at org.apache.spark.sql.catalyst.trees.TreeNode.mapChildren(TreeNode.scala:304)
   	at org.apache.spark.sql.catalyst.trees.TreeNode.transformUp(TreeNode.scala:286)
   	at org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$3.apply(TreeNode.scala:286)
   ```
   In this PR, I refactor the code to prevent None.get.
   
   ## How was this patch tested?
   
   Existing Unit test.
   

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