Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/9383#issuecomment-153451108
@davies: in the stacktrace that you posted, it looks like it's failing when
trying to update a string column when extracting a partial aggregate result
from an input row. What's confusing to me, though, is the fact that a string
column in a partial aggregate result buffer should have prevented
TungstenAggregate from being planned in the first place (see
`TungstenAggregate.supportsAggregate()`). Do you think that there might be an
input attribute binding error that's causing this (i.e. we mistakenly treat
grouping columns as belonging to the partial aggregate result)?
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