SSC-FDM-RS0007

DDL statements perform an automatic COMMIT, ROLLBACK will not work as expected

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Description

In Snowflake, DDL statements perform an automatic commit after their execution, making permanent all the changes in the current transaction, meaning they can not be discarded by a ROLLBACK.

When a ROLLBACK statement is found in a procedure that also contains a DDL statement, SnowConvert will generate this FDM to inform about the DDL autocommit behavior.

Code Example

Input Code:

Redshift

IN -> Redshift_01.sql

CREATE OR REPLACE PROCEDURE rollback_ddl(a int)
    LANGUAGE plpgsql
    AS $$
BEGIN
    INSERT INTO transaction_values_test values (a);
    CREATE TABLE someRollbackTable
    (
        col1 INTEGER
    );

    INSERT INTO someRollbackTable values (a);
    ROLLBACK;
END
$$;

CALL rollback_ddl(10);

Output Code:

Snowflake

OUT -> Redshift_01.sql

CREATE OR REPLACE PROCEDURE rollback_ddl (a int)
RETURNS VARCHAR
    LANGUAGE SQL
    COMMENT = '{ "origin": "sf_sc", "name": "snowconvert", "version": {  "major": 0,  "minor": 0,  "patch": "0" }, "attributes": {  "component": "redshift",  "convertedOn": "03/03/2025",  "domain": "test" }}'
    AS $$
BEGIN
    BEGIN TRANSACTION;
    INSERT INTO transaction_values_test
    values (:a);
    CREATE TABLE someRollbackTable
    (
        col1 INTEGER
    );
    BEGIN TRANSACTION;
    INSERT INTO someRollbackTable
    values (:a);
    --** SSC-FDM-RS0007 - DDL STATEMENTS PERFORM AN AUTOMATIC COMMIT, ROLLBACK WILL NOT WORK AS EXPECTED **
    ROLLBACK;
END
$$;

CALL rollback_ddl(10);

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