MSCEWI3103

For Loop Format Is Currently Not Supported By Snowflake Scripting

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Severity

High

Description

Oracle allows different types of conditions for a FOR LOOP. It supports boolean expressions, collections, records... However, Snowflake scripting only supports FOR LOOP with defined integers as bounds. All other formats are marked as not supported and require additional manual effort to be transformed.

Oracle iteration control clauses that are not supported in Snowflake FOR LOOP:

• single_expression_control

• values_of_control

• indices_of_control

• pairs_of_control

cursor_iteration_control is currently marked as not supported. Removing parenthesis from the expression should transform it as a CURSOR FOR LOOP.

Original:

FOR i IN (cursor_variable) LOOP NULL; END LOOP;

Should be changed to:

FOR i IN cursor_variable LOOP NULL; END LOOP;

Example Code

Input Code:

CREATE OR REPLACE PROCEDURE P3
AS
TYPE values_aat IS TABLE OF PLS_INTEGER INDEX BY PLS_INTEGER;
l_employee_values   values_aat;
BEGIN
FOR power IN REPEAT power*2 WHILE power <= 64 LOOP
    NULL;
END LOOP;

FOR i IN VALUES OF l_employee_values LOOP
    NULL;
END LOOP; 
END;

Output Code:

CREATE OR REPLACE PROCEDURE PUBLIC.P3 ()
RETURNS VARCHAR
LANGUAGE SQL
EXECUTE AS CALLER
AS
$$
   DECLARE
      l_employee_values VARIANT /*** MSC-WARNING - MSCEWI1055 - REFERENCED CUSTOM TYPE 'values_aat' NOT FOUND ***/;
   BEGIN
-- ** MSC-ERROR - MSCEWI3103 - FOR LOOP FORMAT IS CURRENTLY NOT SUPPORTED BY SNOWFLAKE SCRIPTING **
--      /*** MSC-WARNING - MSCEWI3101 - FOR LOOP WITH "WHILE" CLAUSE IS CURRENTLY NOT SUPPORTED BY SNOWFLAKE SCRIPTING ***/
--      FOR power IN REPEAT power*2 WHILE power <= 64 LOOP
--          NULL;
--      END LOOP
              ;

-- ** MSC-ERROR - MSCEWI3103 - FOR LOOP FORMAT IS CURRENTLY NOT SUPPORTED BY SNOWFLAKE SCRIPTING **
--      FOR i IN VALUES OF l_employee_values LOOP
--          NULL;
--      END LOOP
              ;
   END;
$$;

Recommendations

• Rewrite the FOR LOOP condition or use a different kind of LOOP to simulate the behavior.

• If you need more support, you can email us at [email protected]