DB Empty String to Null

Trims any leading and trailing whitespace from the selected columns.

If the resulting value is an empty string (''), it returns NULL; otherwise, it returns the trimmed value.

This ensures that empty or whitespace-only values in the selected column are treated as NULL rather than as empty strings.

Input ports

1. Type: DB Data
   DB Data
   DB Data

Output ports

1. Type: DB Data
   DB Data
   DB Data