et-null-input-behavior-table.md

Value Description
CALLED_ON_NULL_INPUT The function must be called, even if one or more arguments are NULL.
RETURN_NULL_ON_NULL_INPUT The function always returns a NULL value if any of its arguments are NULL.
STRICT A synonym for RETURN_NULL_ON_NULL_INPUT
DEFAULT_STRICTNESS The default strictness setting. This is the same as CALLED_ON_NULL_INPUT.