HyukjinKwon commented on issue #24496: [SPARK-27591][SQL] Fix UnivocityParser for UserDefinedType URL: https://github.com/apache/spark/pull/24496#issuecomment-488134314 UDT is intended to be previate as of SPARK-14155 as of Spark 2.0. And up to my knowledge all other exposed UDTs like VectorUDT are nested struct which CSV doesn't support. So, officially this code bit is intended to be a dead code. I don't think we should backport into both branches but I don't mind if somebody does.
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