message: We shoulnd't unbind columns when close a statement.
diff: @@ -118,7 +118,6 @@ void OdbcHandleStmt::Close() {
  // the parameter values can be reused after
  param_desc->Reset();
  // stmt->stmt.reset(); // the statment can be reuse in prepared statement
  - bound_cols.clear();
  error_messages.clear();
  }
  