@Override
      public String toString() {
        return "PatternRecognitionContext{"
            + "labels="
            + labels
            + ", navigation="
            + navigation
            + '}';
      }
@return the common supertype between the value type and subquery type
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/analyzer/ExpressionAnalyzer.java