[beeswax] Fix issue where beeswax autocomplete on nested types errors on MySQL-backed Hive metastore
[beeswax] Fix issue where beeswax autocomplete on nested types errors on MySQL-backed Hive metastore

For DESCRIBE nested queries, we need to explicitly select the DB before calling describe because Hive raises a syntax error with DB prefaced queries: https://issues.apache.org/jira/browse/HIVE-11261

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