Merge pull request #5460 from segmentio/lizkane222-patch-30

Update destination-filters.md Added Filter Conditional Operators

Author: forstisabella

src/connections/destinations/destination-filters.md

@@ -164,6 +164,17 @@ There are certain destinations to which you may not want to send the `userId`. T
 }
 ```
 
+## Filter conditional operators
+* `contains`: checks whether the field's value includes the provided substring
+* `glob matches`: case sensitive, checks whether the value matches provided string
+* `is (number)`: checks whether the value is exactly the provided integer
+* `is (string)`: checks whether the value is exactly the provided string
+* `is false`: checks whether the value is type boolean and is `false`
+* `is not (number)`: checks whether the value isn't exactly the provided integer
+* `is not (string)`: checks whether the value isn't exactly the provided string
+* `is not null`: checks that the existing field does not have a `null` value
+* `is null`: check that the existing field has a `null` value
+* `is true`: checks whether the value is type boolean and is `true`
 
 ## Important notes