How to run a stored procedure from Hue in Cloudera Data Warehouse

HPL/SQL allows you to implement business logic using variables, expressions, flow-of-control statements, and iterations. HPL/SQL makes SQL-on-Hadoop more dynamic. You can leverage your existing procedural SQL skills, and use functions and statements to make your typical ETL development more productive. In Cloudera Data Warehouse, Hue provides a smart interface to run stored procedures.

To run stored procedures from Hue, create a Hive Virtual Warehouse in CDW and enable the hplsql option in the hue-safety-valve field.

The following example creates a procedure and returns records by passing a cursor:

print 'Hello world';/
CREATE PROCEDURE greet(name STRING)
BEGIN
  PRINT 'Hello ' || name;
END;/
CREATE PROCEDURE even(cur OUT SYS_REFCURSOR)
BEGIN
  OPEN cur FOR
SELECT n FROM NUMBERS
WHERE MOD(n, 2) == 0;
END;/
CREATE PROCEDURE set_message(IN name STRING, OUT result STRING)
BEGIN
 SET result = 'Hello, ' || name || '!';
END;
-- Call the procedure and print the results
DECLARE str STRING;
CALL set_message('world', str);
PRINT str;