private Stream<SummaryField> getSummaryFieldsForImportedField(ImmutableSDField importedField) {
        return schema.getSummaryFields(importedField).stream();
    }
Adds the data type and attribute summary transform ({@link SummaryTransform#ATTRIBUTE} to all {@link SummaryField} having an imported
field as source.

@author bjorncs
config-model/src/main/java/com/yahoo/schema/processing/AddDataTypeAndTransformToSummaryOfImportedFields.java