https://community.cloudera.com/t5/Support-Questions/NIFI-How-can-I-validate-record/m-p/192069#M154146 <P>You should be able to use ValidateRecord for this, although your reader schema might need to treat the incoming field as an int/long so it will read in negative numbers successfully. Then your write schema can have that field with its correct type (date, e.g.) </P><P>You can also use QueryRecord for this, it allows you to query the flow file fields using SQL, such as "SELECT * FROM FLOWFILE WHERE columnDate &gt;= 0" or whatever is appropriate.</P> Mon, 24 Sep 2018 21:24:44 GMT mburgess 2018-09-24T21:24:44Z