Prepare succeeds even with error on rewriting with multiple drivers in some cases

Here are the scenario we saw :

22 Jan 2015 11:21:27,630 [Grizzly-worker(30)] INFO org.apache.lens.server.query.QueryExecutionServiceImpl - ExlainAndPrepare: <?xml version="1.0" encoding="UTF-8" standalone="yes"?><lensSessionHandle><publicId>e9c5f629-1082-49be-9e6c-eb5204460320</publicId><secretId>3e2497bb-49d2-4ea9-b241-dbfc95e2c46f</secretId></lensSessionHandle> query: cube select xxx

....
22 Jan 2015 11:24:19,788 [Grizzly-worker(32)] WARN org.apache.lens.driver.cube.RewriteUtil - Driver : org.apache.lens.driver.jdbc.JDBCDriver Skipped for the query rewriting due to
org.apache.hadoop.hive.ql.parse.SemanticException: No candidate fact table available to answer the query,
....
22 Jan 2015 11:25:14,999 [Grizzly-worker(32)] INFO org.apache.lens.driver.cube.RewriteUtil - Final rewritten query for driver:org.apache.lens.driver.hive.HiveDriver@7a520351 is:
...
22 Jan 2015 11:25:15,132 [Grizzly-worker(32)] ERROR org.apache.lens.server.api.query.DriverSelectorQueryContext - Setting driver plan failed for driver org.apache.lens.driver.hive.HiveDriver@7a520351org.apache.lens.api.LensException: Error executing query
...
22 Jan 2015 11:25:15,380 [Grizzly-worker(32)] INFO org.apache.lens.driver.jdbc.ColumnarSQLRewriter - Input Query : cube select
...
22 Jan 2015 11:25:15,604 [Grizzly-worker(32)] INFO org.apache.lens.driver.jdbc.JDBCDriver - Prepared: d09e32a0-2157-442c-9a95-0cf9496df5b3