JDBCCatalog does not check for namespace existence on table create

[danielcweeks]

Feature Request / Improvement

The JDBCCatalog silently creates namespaces if used in a create statement. This is non-standard and can result in surprising behavior due to simple typos in create statements.

Query engine

No response

[rdblue]

It should be easy to add a flag to do this check. The default behavior is this way because this was implemented without namespace support initially.