UDF CALL

Translation reference for User-defined function (UDF) Call

Some parts in the output code are omitted for clarity reasons.

Description

As is widely acknowledged, non-scalar user-defined functions (UDFs) in Oracle are converted into Snowflake stored procedures to accommodate more intricate functionalities.

This transformation also alters the way the function is invoked, transitioning from a traditional function call to a stored procedure call.

For additional details regarding the invocation of stored procedures, refer to the documentation accessible here: PROCEDURE CALL.

Sample Source Patterns

Consider the next function and tables for the examples below.

IN -> Oracle_01.sql
CREATE OR REPLACE FUNCTION sum_to_varchar_function(p_number1 IN NUMBER, p_number2 IN NUMBER)
RETURN VARCHAR
IS
    result VARCHAR(100);
BEGIN
    result := TO_CHAR(p_number1 + p_number2);
    RETURN result;
END sum_to_varchar_function;

CREATE TABLE example_table (
    id NUMBER,
    column1 NUMBER
);
INSERT INTO example_table VALUES (1, 15);

CREATE TABLE result_table (
    id NUMBER,
    result_col VARCHAR(100)
);

UDF Call

Oracle

IN -> Oracle_02.sql
CREATE OR REPLACE PROCEDURE procedure_calling_function(param1 IN NUMBER)
IS
    result_value VARCHAR(200);
BEGIN 
    result_value := sum_to_varchar_function(3, param1);
    INSERT INTO result_table VALUES (1, result_value);
END;

BEGIN
    procedure_calling_function(5);
END;

Snowflake Scripting

OUT -> Oracle_02.sql
CREATE OR REPLACE PROCEDURE procedure_calling_function (param1 NUMBER(38, 18))
RETURNS VARCHAR
LANGUAGE SQL
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},"attributes":{"component":"oracle"}}'
EXECUTE AS CALLER
AS
$$
    DECLARE
        result_value VARCHAR(200);
    BEGIN
        result_value := sum_to_varchar_function(3, :param1) !!!RESOLVE EWI!!! /*** SSC-EWI-0073 - PENDING FUNCTIONAL EQUIVALENCE REVIEW FOR 'sum_to_varchar_function' NODE ***/!!!;
        INSERT INTO result_table
        VALUES (1, :result_value);
    END;
$$;

DECLARE
    call_results VARIANT;

    BEGIN
    CALL
    procedure_calling_function(5);
    RETURN call_results;
    END;

UDF Call within a query

When a function call is embedded within a query, the invocation process becomes more intricate due to Snowflake's limitation of not being able to call procedures directly within queries. To overcome this limitation, the procedure invocation is moved outside the query, and the result is assigned to a variable. This variable is then referenced within the query, thereby achieving functional equivalence. This approach allows for the execution of more complex behaviors within Snowflake queries while adhering to the procedural constraints.

Oracle

IN -> Oracle_03.sql
CREATE OR REPLACE PROCEDURE procedure_calling_function(param1 IN NUMBER)
IS
    result_value VARCHAR(200);
    result_value2 VARCHAR(200);
BEGIN 
    SELECT
        sum_to_varchar_function(1, param1) AS result_column,
        sum_to_varchar_function(2, param1) AS result_column2
    INTO result_value, result_value2
    FROM example_table ext;

    INSERT INTO result_table VALUES (1, result_value);
    INSERT INTO result_table VALUES (2, result_value2);
END;

BEGIN