@Override
  public Pattern<ProjectNode> getPattern() {
    return PATTERN;
  }
Inlines expressions from a child project node into a parent project node as long as they are
simple constants, or they are referenced only once (to avoid introducing duplicate computation)
and the references don't appear within a TRY block (to avoid changing semantics).
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/planner/iterative/rule/InlineProjections.java