@Override
  public String toString() {
    return "TableSchema{" + "tableName='" + tableName + '\'' + ", columns=" + columns + '}';
  }
Given the name of an ID column, return the index of this column among all ID columns, return -1
if not found.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/metadata/TableSchema.java