public PathPatternTree getPatternTree() {
    return patternTree;
  }
This rewriter:

<p>1. Concat prefix path in SELECT, WHERE, and WITHOUT NULL clause with the suffix path in the
FROM clause.

<p>2. Construct a {@link PathPatternTree}.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/analyze/ConcatPathRewriter.java