Exception "unknown table" should be raised instead of "unknown columns" on 
attempt to create index for non-existent table

                 Key: CORE-5738
                 URL: http://tracker.firebirdsql.org/browse/CORE-5738
             Project: Firebird Core
          Issue Type: Improvement
          Components: Engine, ISQL
    Affects Versions: 3.0.3, 2.5.8, 4.0 Alpha 1
            Reporter: Pavel Zotov
            Priority: Minor

There is something strange in error message when i want to create index for 
NON-existent table.
Consider following script (doing it on empty database):
SQL> create index no_such_index on no_such_table( some_fantastic_column  );
Statement failed, SQLSTATE = 42000
unsuccessful metadata update
-Unknown columns in index NO_SUCH_INDEX

Why "unknown COLUMNS" are mentioned here ?  I just used wrong name of TABLE 
rather than column(s) of it.

IMO, much better to raise SQLSTATE = 42S02 ("-Table unknown"), similar to this 
 SQL> select * from no_such_table;
 Statement failed, SQLSTATE = 42S02
 Dynamic SQL Error
 -SQL error code = -204
 -Table unknown

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