Github user sun-rui commented on the pull request:
https://github.com/apache/spark/pull/8984#issuecomment-151770741
For a DataFrame column of MapType, the key type and value type must be
consistent.
> e[["abd"]] <- 1276
> e[["84798"]] <- "abc"
In your example, the first value type is numeric, while the second value
type is character.
I think this issue is same as
https://issues.apache.org/jira/browse/SPARK-11167
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