Upgrading the example to the latest Flink version

[chirayu-patel]

Hi Team,

The example provided for Queryable window is really great.. Currently I am using Flink's latest version (1.4). When I try update the example to that version, I get lot of errors.

Is there any plan to update the example to this version. Any help is appreciated.

Just a note - I am using this example since I believe that the current Flink version does not yet support querying on windows, it only allows querying on a stream. Is that a correct assumption ?