Github user twalthr commented on a diff in the pull request: https://github.com/apache/flink/pull/729#discussion_r31798470 --- Diff: flink-java/src/main/java/org/apache/flink/api/java/functions/SemanticPropUtil.java --- @@ -309,15 +308,20 @@ public static DualInputSemanticProperties getSemanticPropsDual( getSemanticPropsDualFromString(result, forwardedFirst, forwardedSecond, nonForwardedFirst, nonForwardedSecond, readFirst, readSecond, inType1, inType2, outType); return result; - } else { - return new DualInputSemanticProperties(); } + return null; + } + + public static void getSemanticPropsSingleFromString(SingleInputSemanticProperties result, + String[] forwarded, String[] nonForwarded, String[] readSet, + TypeInformation<?> inType, TypeInformation<?> outType) { + getSemanticPropsSingleFromString(result, forwarded, nonForwarded, readSet, inType, outType, false); } public static void getSemanticPropsSingleFromString(SingleInputSemanticProperties result, String[] forwarded, String[] nonForwarded, String[] readSet, - TypeInformation<?> inType, TypeInformation<?> outType) - { + TypeInformation<?> inType, TypeInformation<?> outType, + boolean skipIncompatibleTypes) { --- End diff -- Sometimes the analyzer works better than required. E.g. the analyzer outputs @ForwardedFields("*->record.customer.name") but if customer is a GenericType output type, the types are incompatible. I thought it is better to reuse the type compatibility checking of the PropUtil than reimplement everything, but skip types that are incompatible without throwing Exceptions.
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