Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/19865
making a variable global need to be done manually(call `ctx.mutableState`),
splitting the code into methods also need to be done manually(call
`ctx.splitExpressions`). If we hit a problem here, it's probably due to misuse.
Can we just check the codebase, find these invalid cases and fix them? We may
probably add document to `ctx.splitExpression` that global variables should not
be in the parameter.
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