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https://issues.apache.org/jira/browse/NIFI-8135?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt Burgess updated NIFI-8135:
-------------------------------
    Fix Version/s: 2.0.0
                   1.24.0
                       (was: 1.latest)
                       (was: 2.latest)
       Resolution: Fixed
           Status: Resolved  (was: Patch Available)

> DataTypeUtils conversion methods for Records to java Maps should respect 
> Choice types
> -------------------------------------------------------------------------------------
>
>                 Key: NIFI-8135
>                 URL: https://issues.apache.org/jira/browse/NIFI-8135
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>    Affects Versions: 1.11.4
>            Reporter: Chris Sampson
>            Assignee: Chris Sampson
>            Priority: Major
>             Fix For: 2.0.0, 1.24.0
>
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> Where a schema field is a Map of Choice, with options of Array (of Strings),  
> Map (of Strings) or String, Record Readers incorrectly deserialise the data 
> of the nested Map/Array as Records containing no schema. When converting the 
> overall Record into a java Map using DataTypeUtils, the nested MapRecord is 
> not converted into a Map.
> This can lead to data loss between readers & writers.
> This appears to be related to one/more of:
> * missing schema in the nested MapRecord object (even if it's presented with 
> the data to the Record Reader) - the conversion methods could infer a schema 
> for such MapRecords rather than effectively skipping them
> * Choice types don't appear to be respected for nested fields (e.g. checking 
> whether the options within a Choice are for Map or Array,  not just whether 
> the field dataType passed to the conversion method is for Map or Array, etc. 
> ... it's a Choice that should allow for these)
> * Array/ Map conversion should not assume all elements within the collection 
> are of the same type, especially if the field's type is Choice



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