Usage of "BLOB SUB_TYPE TEXT" for "free" parameters
---------------------------------------------------

                 Key: CORE-5932
                 URL: http://tracker.firebirdsql.org/browse/CORE-5932
             Project: Firebird Core
          Issue Type: Improvement
          Components: Engine
    Affects Versions: 3.0.4
            Reporter: Kovalenko Dmitry


Test code:

----------------
     cmd.CommandText
      ="SELECT \"r\".\"TEST_ID\", \"r\".\"COL_VARCHAR_10\"\n"
      +"FROM \"TEST_MODIFY_ROW\" AS \"r\"\n"
      +"WHERE (:__src_0||\"r\".\"COL_VARCHAR_10\" STARTING WITH _utf8 'Q') AND 
(\"r\".\"TEST_ID\" = :__testID_1)";

     cmd.Prepare();

     Assert.AreEqual
      (1,                     //<---  USUS
       cmd["__src_0"].Size);
----------------

Server describes "__src_0" as parameter with datatype "(var)char(1)".

I offer to use a "BLOB (SUB_TYPE TEXT)" datatype.


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