private void verifyNoNormalizers(String where, RankingExpressionFunction f, Map<String, RankFeatureNormalizer> allNormalizers, RankProfileTransformContext context) {
        if (f == null) return;
        verifyNoNormalizers(where, f.function(), allNormalizers, context);
    }
Returns the path type, if valuePath is set.
config-model/src/main/java/com/yahoo/schema/RankProfile.java