Operators available for comparing the value of fields.
Values:
RELATIONAL_OPERATOR_UNSPECIFIED (0):
Unused
EQUAL_TO (1):
Equal. Attempts to match even with
incompatible types.
NOT_EQUAL_TO (2):
Not equal to. Attempts to match even with
incompatible types.
GREATER_THAN (3):
Greater than.
LESS_THAN (4):
Less than.
GREATER_THAN_OR_EQUALS (5):
Greater than or equals.
LESS_THAN_OR_EQUALS (6):
Less than or equals.
EXISTS (7):
Exists