The field type of value and field do not need to
match to be considered equal, but not all comparisons are possible.
EQUAL_TO and NOT_EQUAL_TO attempt to compare even with incompatible
types, but all other comparisons are invalid with incompatible types. A
value of type:
string can be compared against all other types
boolean can only be compared against other booleans
integer can be compared against doubles or a string if the string
value can be parsed as an integer.
double can be compared against integers or a string if the string
can be parsed as a double.
Timestamp can be compared against strings in RFC 3339 date string
format.
TimeOfDay can be compared against timestamps and strings in the
format of ‘HH:mm:ss’.
If we fail to compare do to type mismatch, a warning will be given and
the condition will evaluate to false.
Required. Operator used to compare the field or infoType to
the value.
