Fixed head and tail operations on the OSS_DATA table. Added a condition
to check whether the table is OSS_DATA when the operation is head or
tail. If so, it sets up the query to get the first or last n rows of
the table. Tested that head and tail operations work on OSS_DATA table.
Also tested that head and tail operations work on all tables which they
worked on before the change.
Fixed head and tail operations on the OSS_DATA table. Added a condition to check whether the table is OSS_DATA when the operation is head or tail. If so, it sets up the query to get the first or last n rows of the table. Tested that head and tail operations work on OSS_DATA table. Also tested that head and tail operations work on all tables which they worked on before the change.
Closes #18