Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20021#discussion_r157821074
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
---
@@ -930,6 +930,18 @@ class CodegenContext {
// inline execution if only one block
blocks.head
} else {
+ if (Utils.isTesting) {
+ // Passing global variables to the split method is dangerous, as
any mutating to it is
+ // ignored and may lead to unexpected behavior.
+ // We don't need to check `arrayCompactedMutableStates` here, as
it results to array access
--- End diff --
is there any place we would do that? `ctx.addMutableState` returns an array
access code, I can't image a caller would extract the array name from it and
use it as parameters...
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