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src/sql/engine/expr/ob_expr_connect_by_root.cpp

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+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#define USING_LOG_PREFIX SQL_ENG
+#include "sql/engine/expr/ob_expr_connect_by_root.h"
+#include "sql/engine/expr/ob_expr_result_type_util.h"
+#include "share/ob_i_sql_expression.h"
+
+using namespace oceanbase::sql;
+using namespace oceanbase::common;
+ObExprConnectByRoot::ObExprConnectByRoot(common::ObIAllocator& alloc)
+    : ObExprOperator(alloc, T_OP_CONNECT_BY_ROOT, N_CONNECT_BY_ROOT, 1, NOT_ROW_DIMENSION){};
+int ObExprConnectByRoot::calc_result_type1(ObExprResType& type, ObExprResType& type1, ObExprTypeCtx& type_ctx) const
+{
+  int ret = OB_SUCCESS;
+  type = type1;
+  UNUSED(type_ctx);
+  return ret;
+}
+
+int ObExprConnectByRoot::calc_result1(ObObj& result, const ObObj& obj, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  result = obj;
+  UNUSED(expr_ctx);
+  return ret;
+}
+
+int ObExprConnectByRoot::cg_expr(ObExprCGCtx&, const ObRawExpr&, ObExpr& rt_expr) const
+{
+  int ret = OB_SUCCESS;
+  CK(1 == rt_expr.arg_cnt_);
+  rt_expr.eval_func_ = ObExprConnectByRoot::eval_connect_by_root;
+  return ret;
+}
+
+int ObExprConnectByRoot::eval_connect_by_root(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
+{
+  int ret = OB_SUCCESS;
+  ObDatum* arg = NULL;
+  if (OB_FAIL(expr.eval_param_value(ctx, arg))) {
+    LOG_WARN("expression evaluate parameters failed", K(ret));
+  } else {
+    expr_datum.set_datum(*arg);
+  }
+  return ret;
+}