[SPARK-13972][SQ] hive tests should fail if SQL generation failed

## What changes were proposed in this pull request?

Now we should be able to convert all logical plans to SQL string, if they are parsed from hive query. This PR changes the error handling to throw exceptions instead of just log.

We will send new PRs for spotted bugs, and merge this one after all bugs are fixed.

## How was this patch tested?

existing tests.

Author: Wenchen Fan <wenchen@databricks.com>

Closes #11782 from cloud-fan/test.