Implement the SQL standard COALESCE function.
This function returns the first non-NULL argument, or NULL if all are NULL. Argument count is limited to 99. Includes a unit test TestIssue211. Fixes #211 (closed).
Closes #211 (closed)
This function returns the first non-NULL argument, or NULL if all are NULL. Argument count is limited to 99. Includes a unit test TestIssue211. Fixes #211 (closed).
Closes #211 (closed)