start ETL/ELT()
This function starts ETL/ELT pipeline a.
Returns the ETL/ELT job number on success, "-1" else.
The name of a map containing ETL/ELT variables can be passed in parameter b.
Parameters
| Parameter | Description | 
| a | Name of the ETL/ELT pipeline to start. | 
| b | (optional) Name of the map containing ETL/ELT variables to be passed (name of the variable in the map key, value of the variable in the map value). |