Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/19811#discussion_r154012855 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala --- @@ -168,6 +166,21 @@ class CodegenContext { val mutableStates: mutable.ArrayBuffer[(String, String, String)] = mutable.ArrayBuffer.empty[(String, String, String)] + // An array keyed by the tuple of mutable states' types and initialization code, holds the + // current max index of the array + var mutableStateArrayIdx: mutable.Map[(String, String), Int] = + mutable.Map.empty[(String, String), Int] + + // An array keyed by the tuple of mutable states' types and initialization code, holds the + // current name of the mutableStateArray into which state of the given key will be compacted + var mutableStateArrayCurrentNames: mutable.Map[(String, String), String] = + mutable.Map.empty[(String, String), String] + + // An array keyed by the tuple of mutable states' types, array names and initialization code, + // holds the code that will initialize the mutableStateArray when initialized in loops + var mutableStateArrayInitCodes: mutable.ArrayBuffer[(String, String, String)] = --- End diff -- This is also keyed by `(javaType, arrayName)`.
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