Hive does not accept table names that begin with a "_". #909
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See https://issues.apache.org/jira/browse/HIVE-6431
Switch to using "x" as the prefix for unique_name().
I've started work on a Hive backend for dplyr that is working well so far. I'll be staging that for pull soon. This is a simple change that seems innocuous and is required by Hive due to its restrictions on tables and variables starting with an underscore.
Resubmitted to re-try the build which failed due to an external matter.