SSC-FDM-TD0030

A return statement was added at the end of the label section to ensure the same execution flow

Description

When a Goto statement is replaced with a Label section and does not contain a return statement, one is added at the end of the section to ensure the same execution flow.

BTEQ after a Goto command is executed, the statements between the goto command and the label command with the same name are ignored. So, to avoid those statements being executed the label section should contain a return statement.

In addition, it is worth value mentioning the Goto command skips all the other statements except for the Label with the same name, which is when the execution resumes. Therefore, the execution will never resume in a label section defined before the Goto command.

Example Code

Input Code:

IN -> Teradata_01.bteq

-- Additional Params: --scriptsTargetLanguage SnowScript
.LOGON dbc,dbc;
select 'STATEMENTS';
.GOTO LABEL_B
select 'IGNORED STATEMENTS';
.label LABEL_B
select 'LABEL_B STATEMENTS';

Output Code

OUT -> Teradata_01.sql

EXECUTE IMMEDIATE
$$
  DECLARE
    STATUS_OBJECT OBJECT := OBJECT_CONSTRUCT('SQLCODE', 0);
  BEGIN
    -- Additional Params: --scriptsTargetLanguage SnowScript
    --.LOGON dbc,dbc
    !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'BTLogOn' NODE ***/!!!
    null;
    BEGIN
      SELECT
        'STATEMENTS';
      STATUS_OBJECT := OBJECT_CONSTRUCT('SQLROWCOUNT', SQLROWCOUNT);
    EXCEPTION
      WHEN OTHER THEN
        STATUS_OBJECT := OBJECT_CONSTRUCT('SQLCODE', SQLCODE, 'SQLERRM', SQLERRM, 'SQLSTATE', SQLSTATE);
    END;
     
    /*.label LABEL_B*/
     
    BEGIN
      SELECT
        'LABEL_B STATEMENTS';
      STATUS_OBJECT := OBJECT_CONSTRUCT('SQLROWCOUNT', SQLROWCOUNT);
    EXCEPTION
      WHEN OTHER THEN
        STATUS_OBJECT := OBJECT_CONSTRUCT('SQLCODE', SQLCODE, 'SQLERRM', SQLERRM, 'SQLSTATE', SQLSTATE);
    END;
    --** SSC-FDM-TD0030 - A RETURN STATEMENT WAS ADDED AT THE END OF THE LABEL SECTION LABEL_B TO ENSURE THE SAME EXECUTION FLOW **
    RETURN 0;
    BEGIN
      SELECT
        'IGNORED STATEMENTS';
      STATUS_OBJECT := OBJECT_CONSTRUCT('SQLROWCOUNT', SQLROWCOUNT);
    EXCEPTION
      WHEN OTHER THEN
        STATUS_OBJECT := OBJECT_CONSTRUCT('SQLCODE', SQLCODE, 'SQLERRM', SQLERRM, 'SQLSTATE', SQLSTATE);
    END;
    /*.label LABEL_B*/
    --** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE.  **
     
    BEGIN
      SELECT
        'LABEL_B STATEMENTS';
      STATUS_OBJECT := OBJECT_CONSTRUCT('SQLROWCOUNT', SQLROWCOUNT);
    EXCEPTION
      WHEN OTHER THEN
        STATUS_OBJECT := OBJECT_CONSTRUCT('SQLCODE', SQLCODE, 'SQLERRM', SQLERRM, 'SQLSTATE', SQLSTATE);
    END;
  END
$$

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