gengliangwang edited a comment on issue #24806: [WIP][SPARK-27856][SQL] Only allow type upcasting when inserting table URL: https://github.com/apache/spark/pull/24806#issuecomment-501189948 As discussed in https://github.com/apache/spark/pull/24849 , we can't upcast decimal to double/float. I think we might have to close this one. Then, we can't do the upcasting either in V2 write path. Or, we can match the case of converting decimal to double/float in [DataType.canWrite](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/types/DataType.scala#L368). There can be other solutions. What do you think? @cloud-fan @rdblue @gatorsmile
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