Github user viirya commented on the issue: https://github.com/apache/spark/pull/19418 From the stacktrace posted in the JIRA, the problematic code is: /* 151 */ comp = agg_bufValue.compare(smj_value3); `agg_bufValue` is a `long` but `smj_value3` is a `UTF8String`. It looks strange because we should not to compare two variable in different types at all. Looks like you don't have re-producible codes for this issue. So I don't think you found the root cause.
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