Github user simonellistonball commented on a diff in the pull request: https://github.com/apache/metron/pull/861#discussion_r155698109 --- Diff: metron-platform/metron-parsers/README.md --- @@ -216,6 +216,23 @@ whenever `field2` exists and whose corresponding equal to 'foo': } ``` +* `SELECT`: This transformation filters the fields in the message to include only the configured output fields, and drops any not explicitly included. + +For example: +``` +{ +... + "fieldTransformations" : [ + { + "output" : ["field1", "field2" ] + , "transformation" : "SELECT" + } + ] +} +``` + +when applied to a message containing keys field1, field2 and field3, will only output the first two. + --- End diff -- agreed, and added.
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