Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/15567#discussion_r84339569
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
---
@@ -185,6 +185,20 @@ class CodegenContext {
}
/**
+ * Code statements to initialize states that depend on the partition
index.
+ * An integer `partitionIndex` will be made available within the scope.
+ */
+ val partitionInitializationStatements: mutable.ArrayBuffer[String] =
mutable.ArrayBuffer.empty
+
+ def addPartitionInitializationStatement(statement: String): Unit = {
--- End diff --
I'm a little worried about introducing more issues by moving
`initMutableStates` out from the constructor. The current implementation at
least maintains the existing behavior if we missed
`initializeStatesForPartition` somewhere.
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