Github user maropu commented on the issue:
https://github.com/apache/spark/pull/21747
How about making a temporary helper function for `sameType` in
`ComplexTypeMergingExpression`? You read the config for case sensitivity in a
driver side, and hold it as a field value in the closure. Then, the helper
function references the (serialized and deserialized) value in executor sides?
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