odata2-annotation-processor/annotation-processor-core/src/main/java/org/apache/olingo/odata2/annotation/processor/core/ListsProcessor.java [892:921]:
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  private Object retrieveData(final EdmEntitySet startEntitySet, final List<KeyPredicate> keyPredicates,
      final EdmFunctionImport functionImport, final Map<String, Object> functionImportParameters,
      final List<NavigationSegment> navigationSegments) throws ODataException {
    Object data;
    final Map<String, Object> keys = mapKey(keyPredicates);

    ODataContext context = getContext();
    final int timingHandle = context.startRuntimeMeasurement(getClass().getSimpleName(), "retrieveData");

    try {
      data = functionImport == null ?
          keys.isEmpty() ?
              dataSource.readData(startEntitySet) : dataSource.readData(startEntitySet, keys) :
          dataSource.readData(functionImport, functionImportParameters, keys);

      EdmEntitySet currentEntitySet =
          functionImport == null ? startEntitySet : functionImport.getEntitySet();
      for (NavigationSegment navigationSegment : navigationSegments) {
        data = dataSource.readRelatedData(
            currentEntitySet,
            data,
            navigationSegment.getEntitySet(),
            mapKey(navigationSegment.getKeyPredicates()));
        currentEntitySet = navigationSegment.getEntitySet();
      }
    } finally {
      context.stopRuntimeMeasurement(timingHandle);
    }
    return data;
  }
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odata2-lib/odata-ref/src/main/java/org/apache/olingo/odata2/ref/processor/ListsProcessor.java [902:931]:
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  private Object retrieveData(final EdmEntitySet startEntitySet, final List<KeyPredicate> keyPredicates,
      final EdmFunctionImport functionImport, final Map<String, Object> functionImportParameters,
      final List<NavigationSegment> navigationSegments) throws ODataException {
    Object data;
    final Map<String, Object> keys = mapKey(keyPredicates);

    ODataContext context = getContext();
    final int timingHandle = context.startRuntimeMeasurement(getClass().getSimpleName(), "retrieveData");

    try {
      data = functionImport == null ?
          keys.isEmpty() ?
              dataSource.readData(startEntitySet) : dataSource.readData(startEntitySet, keys) :
          dataSource.readData(functionImport, functionImportParameters, keys);

      EdmEntitySet currentEntitySet =
          functionImport == null ? startEntitySet : functionImport.getEntitySet();
      for (NavigationSegment navigationSegment : navigationSegments) {
        data = dataSource.readRelatedData(
            currentEntitySet,
            data,
            navigationSegment.getEntitySet(),
            mapKey(navigationSegment.getKeyPredicates()));
        currentEntitySet = navigationSegment.getEntitySet();
      }
    } finally {
      context.stopRuntimeMeasurement(timingHandle);
    }
    return data;
  }
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