Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/19811#discussion_r156853851
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
 ---
    @@ -205,18 +287,35 @@ class CodegenContext {
       def declareMutableStates(): String = {
         // It's possible that we add same mutable state twice, e.g. the 
`mergeExpressions` in
         // `TypedAggregateExpression`, we should call `distinct` here to 
remove the duplicated ones.
    -    mutableStates.distinct.map { case (javaType, variableName, _) =>
    +    val inlinedStates = mutableStates.distinct.map { case (javaType, 
variableName, _) =>
           s"private $javaType $variableName;"
    -    }.mkString("\n")
    +    }
    +
    +    val arrayStates = mutableStateArrayIdx.keys.map { case (javaType, 
arrayName) =>
    +      val length = mutableStateArrayIdx((javaType, arrayName)) + 1
    +      if (javaType.matches("^.*\\[\\]$")) {
    --- End diff --
    
    shall we just check `javaType.contains("[]")`?


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