Specifies an ordering relationship on two arguments, called left
and right.
Values:
COMPARISON_UNSPECIFIED (0):
No ordering relationship is specified.
COMPARISON_GT (1):
True if the left argument is greater than the
right argument.
COMPARISON_GE (2):
True if the left argument is greater than or
equal to the right argument.
COMPARISON_LT (3):
True if the left argument is less than the
right argument.
COMPARISON_LE (4):
True if the left argument is less than or
equal to the right argument.
COMPARISON_EQ (5):
True if the left argument is equal to the
right argument.
COMPARISON_NE (6):
True if the left argument is not equal to the
right argument.
