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https://issues.apache.org/jira/browse/FLINK-8854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16395556#comment-16395556
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ASF GitHub Bot commented on FLINK-8854:
---------------------------------------

Github user twalthr commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5662#discussion_r173881141
  
    --- Diff: 
flink-connectors/flink-connector-kafka-base/src/test/java/org/apache/flink/streaming/connectors/kafka/KafkaJsonTableSourceFactoryTestBase.java
 ---
    @@ -89,9 +94,10 @@ private void testTableSource(FormatDescriptor format) {
                // construct table source using a builder
     
                final Map<String, String> tableJsonMapping = new HashMap<>();
    +           tableJsonMapping.put("name", "name");
    --- End diff --
    
    @fhueske what do you think about this whole mapping business?


> Mapping of SchemaValidator.deriveFieldMapping() is incorrect.
> -------------------------------------------------------------
>
>                 Key: FLINK-8854
>                 URL: https://issues.apache.org/jira/browse/FLINK-8854
>             Project: Flink
>          Issue Type: Bug
>          Components: Table API &amp; SQL
>    Affects Versions: 1.5.0
>            Reporter: Fabian Hueske
>            Assignee: Timo Walther
>            Priority: Blocker
>             Fix For: 1.5.0, 1.6.0
>
>
> The field mapping returned by {{SchemaValidator.deriveFieldMapping()}} is not 
> correct.
> It should not only include all fields of the table schema, but also all 
> fields of the format schema (mapped to themselves). Otherwise, it is not 
> possible to use a timestamp extractor on a field that is not in table schema. 
> For example this configuration would fail:
> {code}
> sources:
>   - name: TaxiRides
>     schema:
>       - name: rideId
>         type: LONG
>       - name: rowTime
>         type: TIMESTAMP
>         rowtime:
>           timestamps:
>             type: "from-field"
>             from: "rideTime"
>           watermarks:
>             type: "periodic-bounded"
>             delay: "60000"
>     connector:
>       ....
>     format:
>       property-version: 1
>       type: json
>       schema: "ROW(rideId LONG, rideTime TIMESTAMP)"
> {code}
> because {{rideTime}} is not in the table schema.



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