@Override
  public Statement visitShowModels(IoTDBSqlParser.ShowModelsContext ctx) {
    ShowModelsStatement statement = new ShowModelsStatement();
    if (ctx.modelId != null) {
      statement.setModelName(parseIdentifier(ctx.modelId.getText()));
    }
    return statement;
  }
Check and set datatype, encoding, compressor.

@throws SemanticException if encoding or dataType meets error handling
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/parser/ASTVisitor.java