SSC-FDM-TS0026

DELETE case is not being considered in the temporary table

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Description

There is an INSERT statement pattern that requires a specific transformation, which involves the creation of a temporary table. This FDM notifies that the DELETE case is not considered in the transformation mentioned. Please visit INSERT with Table DML Factor with MERGE as DML to get more information about this pattern.

Input Code:

Sql Server

IN -> SqlServer_01.sql

INSERT INTO T3
SELECT
	col1,
  col2
FROM (
  MERGE T1 USING T2
  	ON T1.col1 = T2.col1
  WHEN NOT MATCHED THEN
    INSERT VALUES ( T2.col1, T2.col2 )
  WHEN MATCHED THEN
    UPDATE SET T1.col2 = t2.col2
  OUTPUT
  	$action ACTION_OUT,
    T2.col1,
    T2.col2
) AS MERGE_OUT
 WHERE ACTION_OUT='UPDATE';

Output Code:

Snowflake

OUT -> SqlServer_01.sql

--** SSC-FDM-TS0026 - DELETE CASE IS NOT BEING CONSIDERED, PLEASE CHECK IF THE ORIGINAL MERGE PERFORMS IT **
CREATE OR REPLACE TEMPORARY TABLE MERGE_OUT AS
	SELECT
		CASE
			WHEN T1.$1 IS NULL
				THEN 'INSERT'
			ELSE 'UPDATE'
		END ACTION_OUT,
		T2.col1,
		T2.col2
	FROM
		T2
		LEFT JOIN
			T1
			ON T1.col1 = T2.col1;

MERGE INTO T1
USING T2
ON T1.col1 = T2.col1
WHEN NOT MATCHED THEN
	   INSERT VALUES (T2.col1, T2.col2)
WHEN MATCHED THEN
	UPDATE SET
		T1.col2 = t2.col2
		!!!RESOLVE EWI!!! /*** SSC-EWI-0021 - OUTPUT CLAUSE NOT SUPPORTED IN SNOWFLAKE ***/!!!
		OUTPUT
			$action ACTION_OUT,
		  T2.col1,
		  T2.col2 ;

		INSERT INTO T3
		SELECT
	col1,
	col2
		FROM
	MERGE_OUT
		WHERE
	ACTION_OUT ='UPDATE';

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