bug: file types handled wrong

[sitano]

Describe the bug

If you create a CSV sourced table with the filename that does NOT have the .csv ending it will NOT work.

To Reproduce
Steps to reproduce the behavior:

1. CREATE EXTERNAL TABLE test (...) STORED AS CSV WITH HEADER ROW LOCATION 'afile'; // not afile.csv
2. SELECT * FROM test LIMIT 1;
3. Got nothing...

Expected behavior

It must work and return data.

Additional context

Table types must not depend on the filename...

[tustvold]

Closing as duplicate of #1736