private static boolean isSupportedPositionType(DataType dataType) {
        return GeoPos.isAnyPos(dataType);
    }
Adds a "fieldName_zcurve" long attribute and "fieldName.distance" and "FieldName.position" summary fields to all position type fields.

@author bratseth
config-model/src/main/java/com/yahoo/schema/processing/CreatePositionZCurve.java