INTERVAL UDFs

There are two UDFs related to Interval operations:

DATEADD UDF INTERVALDATEDIFF UDF INTERVAL

Necessary code to run INTERVAL UDFs

In order to run any of the interval UDFs, it is necessary to run the following code before:

CREATE OR REPLACE FUNCTION PUBLIC.INTERVAL2MONTHS_UDF
(INPUT_VALUE VARCHAR())
RETURNS INTEGER
IMMUTABLE
AS
$$
CASE WHEN SUBSTR(INPUT_VALUE,1,1) = '-' THEN
   12 * CAST(SUBSTR(INPUT_VALUE,1 , POSITION('-', INPUT_VALUE,2)-1) AS INTEGER)
   - CAST(SUBSTR(INPUT_VALUE,POSITION('-', INPUT_VALUE)+1) AS INTEGER)
ELSE
   12 * CAST(SUBSTR(INPUT_VALUE,1 , POSITION('-', INPUT_VALUE,2)-1) AS INTEGER)
   + CAST(SUBSTR(INPUT_VALUE,POSITION('-', INPUT_VALUE)+1) AS INTEGER)
END
$$;

CREATE OR REPLACE FUNCTION PUBLIC.INTERVAL2SECONDS_UDF
(INPUT_PART VARCHAR(30), INPUT_VALUE VARCHAR())
RETURNS DECIMAL(20,6)
IMMUTABLE
AS
$$
CASE WHEN SUBSTR(INPUT_VALUE,1,1) = '-' THEN
   DECODE(INPUT_PART,
           'DAY',              86400 * INPUT_VALUE, 
           'DAY TO HOUR',      86400 * CAST(SUBSTR(INPUT_VALUE, 1, POSITION(' ', INPUT_VALUE)-1) AS DECIMAL(10,0)) 
                               - 3600 * CAST(SUBSTR(INPUT_VALUE, POSITION(' ', INPUT_VALUE)+1) AS DECIMAL(10,0)),
           'DAY TO MINUTE',    86400 * CAST(SUBSTR(INPUT_VALUE, 1, POSITION(' ', INPUT_VALUE)-1) AS INTEGER) 
                               - 3600 * CAST(SUBSTR(INPUT_VALUE, POSITION(' ', INPUT_VALUE)+1, POSITION(':', INPUT_VALUE)-POSITION(' ', INPUT_VALUE)-1) AS INTEGER) 
                               - 60 * CAST(SUBSTR(INPUT_VALUE, POSITION(':', INPUT_VALUE)+1) AS INTEGER),
           'DAY TO SECOND',    86400 * CAST(SUBSTR(INPUT_VALUE, 1, POSITION(' ', INPUT_VALUE)-1) AS INTEGER) 
                               - 3600 * CAST(SUBSTR(INPUT_VALUE, POSITION(' ', INPUT_VALUE)+1, POSITION(':', INPUT_VALUE)-POSITION(' ', INPUT_VALUE)-1) AS INTEGER)
                               - 60 * CAST(SUBSTR(INPUT_VALUE, POSITION(':', INPUT_VALUE)+1, POSITION(':', INPUT_VALUE, POSITION(':', INPUT_VALUE)+1) - POSITION(':', INPUT_VALUE) - 1) AS INTEGER)
                               - CAST(SUBSTR(INPUT_VALUE,POSITION(':', INPUT_VALUE, POSITION(':', INPUT_VALUE)+1)+1) AS DECIMAL(10,6)),
           'DAY TO SECOND(3)',  86400 * CAST(SUBSTR(INPUT_VALUE, 1, POSITION(' ', INPUT_VALUE)-1) AS INTEGER) 
                               - 3600 * CAST(SUBSTR(INPUT_VALUE, POSITION(' ', INPUT_VALUE)+1, POSITION(':', INPUT_VALUE)-POSITION(' ', INPUT_VALUE)-1) AS INTEGER)
                               - 60 * CAST(SUBSTR(INPUT_VALUE, POSITION(':', INPUT_VALUE)+1, POSITION(':', INPUT_VALUE, POSITION(':', INPUT_VALUE)+1) - POSITION(':', INPUT_VALUE) - 1) AS INTEGER)
                               - CAST(SUBSTR(INPUT_VALUE,POSITION(':', INPUT_VALUE, POSITION(':', INPUT_VALUE)+1)+1) AS DECIMAL(10,6)),
           'HOUR(3)',          3600 * INPUT_VALUE,  
           'HOUR',             3600 * INPUT_VALUE, 
           'HOUR TO MINUTE',   3600 * CAST(SUBSTR(INPUT_VALUE,1 , POSITION(':', INPUT_VALUE)-1) AS INTEGER)
                               - 60 * CAST(SUBSTR(INPUT_VALUE,POSITION(':', INPUT_VALUE)+1) AS INTEGER),
           'HOUR TO SECOND',   3600 * CAST(SUBSTR(INPUT_VALUE, 1, POSITION(':', INPUT_VALUE)-POSITION(' ', INPUT_VALUE)-1) AS INTEGER)
                               - 60 * CAST(SUBSTR(INPUT_VALUE, POSITION(':', INPUT_VALUE)+1, POSITION(':', INPUT_VALUE, POSITION(':', INPUT_VALUE)+1) - POSITION(':', INPUT_VALUE) - 1) AS INTEGER)
                               - CAST(SUBSTR(INPUT_VALUE,POSITION(':', INPUT_VALUE, POSITION(':', INPUT_VALUE)+1)+1) AS DECIMAL(10,6)),  
           'MINUTE',           60 * INPUT_VALUE,     
           'MINUTE TO SECOND', 60 * CAST(SUBSTR(INPUT_VALUE, 1, POSITION(':', INPUT_VALUE)-POSITION(' ', INPUT_VALUE)-1) AS INTEGER)
                               - CAST(SUBSTR(INPUT_VALUE, POSITION(':', INPUT_VALUE)+1) AS DECIMAL(10,6)),
           'SECOND(2,3)',      INPUT_VALUE, 
           'SECOND',           INPUT_VALUE                                    
            )
ELSE
   DECODE(INPUT_PART,
           'DAY',              86400 * INPUT_VALUE, 
           'DAY TO HOUR',      86400 * CAST(SUBSTR(INPUT_VALUE, 1, POSITION(' ', INPUT_VALUE)-1) AS INTEGER) 
                               + 3600 * CAST(SUBSTR(INPUT_VALUE, POSITION(' ', INPUT_VALUE)+1) AS INTEGER),
           'DAY TO MINUTE',    86400 * CAST(SUBSTR(INPUT_VALUE, 1, POSITION(' ', INPUT_VALUE)-1) AS INTEGER) 
                               + 3600 * CAST(SUBSTR(INPUT_VALUE, POSITION(' ', INPUT_VALUE)+1, POSITION(':', INPUT_VALUE)-POSITION(' ', INPUT_VALUE)-1) AS INTEGER) 
                               + 60 * CAST(SUBSTR(INPUT_VALUE, POSITION(':', INPUT_VALUE)+1) AS INTEGER),
           'DAY TO SECOND',    86400 * CAST(SUBSTR(INPUT_VALUE, 1, POSITION(' ', INPUT_VALUE)-1) AS INTEGER) 
                               + 3600 * CAST(SUBSTR(INPUT_VALUE, POSITION(' ', INPUT_VALUE)+1, POSITION(':', INPUT_VALUE)-POSITION(' ', INPUT_VALUE)-1) AS INTEGER)
                               + 60 * CAST(SUBSTR(INPUT_VALUE, POSITION(':', INPUT_VALUE)+1, POSITION(':', INPUT_VALUE, POSITION(':', INPUT_VALUE)+1) - POSITION(':', INPUT_VALUE) - 1) AS INTEGER)
                               + CAST(SUBSTR(INPUT_VALUE,POSITION(':', INPUT_VALUE, POSITION(':', INPUT_VALUE)+1)+1) AS DECIMAL(10,6)),
           'DAY TO SECOND(3)',    86400 * CAST(SUBSTR(INPUT_VALUE, 1, POSITION(' ', INPUT_VALUE)-1) AS INTEGER) 
                               + 3600 * CAST(SUBSTR(INPUT_VALUE, POSITION(' ', INPUT_VALUE)+1, POSITION(':', INPUT_VALUE)-POSITION(' ', INPUT_VALUE)-1) AS INTEGER)
                               + 60 * CAST(SUBSTR(INPUT_VALUE, POSITION(':', INPUT_VALUE)+1, POSITION(':', INPUT_VALUE, POSITION(':', INPUT_VALUE)+1) - POSITION(':', INPUT_VALUE) - 1) AS INTEGER)
                               + CAST(SUBSTR(INPUT_VALUE,POSITION(':', INPUT_VALUE, POSITION(':', INPUT_VALUE)+1)+1) AS DECIMAL(10,6)),
           'HOUR(3)',          3600 * INPUT_VALUE,                     
           'HOUR',             3600 * INPUT_VALUE, 
           'HOUR TO MINUTE',   3600 * CAST(SUBSTR(INPUT_VALUE,1 , POSITION(':', INPUT_VALUE)-1) AS INTEGER)
                               + 60 * CAST(SUBSTR(INPUT_VALUE,POSITION(':', INPUT_VALUE)+1) AS INTEGER),
           'HOUR TO SECOND',   3600 * CAST(SUBSTR(INPUT_VALUE, 1, POSITION(':', INPUT_VALUE)-POSITION(' ', INPUT_VALUE)-1) AS INTEGER)
                               + 60 * CAST(SUBSTR(INPUT_VALUE, POSITION(':', INPUT_VALUE)+1, POSITION(':', INPUT_VALUE, POSITION(':', INPUT_VALUE)+1) - POSITION(':', INPUT_VALUE) - 1) AS INTEGER)
                               + CAST(SUBSTR(INPUT_VALUE,POSITION(':', INPUT_VALUE, POSITION(':', INPUT_VALUE)+1)+1) AS DECIMAL(10,6)),  
           'MINUTE',           60 * INPUT_VALUE,     
           'MINUTE TO SECOND', 60 * CAST(SUBSTR(INPUT_VALUE, 1, POSITION(':', INPUT_VALUE)-POSITION(' ', INPUT_VALUE)-1) AS INTEGER)
                               + CAST(SUBSTR(INPUT_VALUE, POSITION(':', INPUT_VALUE)+1) AS DECIMAL(10,6)), 
           'SECOND(2,3)',      INPUT_VALUE, 
           'SECOND',           INPUT_VALUE                                    
        )
END
$$;