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From cestella <...@git.apache.org>
Subject [GitHub] metron pull request #727: METRON-1146: Add ability to parse JSON string into...
Date Fri, 01 Sep 2017 14:57:29 GMT
Github user cestella commented on a diff in the pull request:

    https://github.com/apache/metron/pull/727#discussion_r136594535
  
    --- Diff: metron-stellar/stellar-common/src/main/java/org/apache/metron/stellar/dsl/functions/StringFunctions.java
---
    @@ -450,4 +454,40 @@ public Object apply(List<Object> strings) {
         }
       }
     
    +  @Stellar( name = "PARSE_JSON_STRING"
    +          , description = "Returns a JSON object for the specified JSON string"
    +          , params = {
    +            "str - the JSON String to convert, may be null"
    +          }
    +          , returns = "an Object containing the parsed JSON string"
    +  )
    +  public static class ParseJsonString extends BaseStellarFunction {
    +
    --- End diff --
    
    So, the usecase is having an enrichment which stores a JSON blob in HBase (or some other
store) that you want to marshall into a Java object to interact with via stellar.  Some people
would prefer to have their data in a readable format rather than serialized via kryo (like
we do in the profiler) or restricted to a certain format (like we do in enrichments).  This
opens up those use-cases.
    
    That JSON blob may be a map or a list or a primitive; the idea is to let jackson handle
the parsing of it, so the bounds are what JSON can represent.  The knowledge of what is returned
would be necessary for the caller, though, as you say.


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