init push

2021-05-31 22:56:52 +08:00
commit cea7de1475
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--- a/src/sql/engine/expr/ob_expr_prior.cpp
+++ b/src/sql/engine/expr/ob_expr_prior.cpp
@ -0,0 +1,117 @@
+/**
+ * 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_prior.h"
+#include "share/object/ob_obj_cast.h"
+#include "sql/engine/expr/ob_expr_result_type_util.h"
+#include "sql/session/ob_sql_session_info.h"
+#include "sql/engine/ob_phy_operator.h"
+#include "sql/engine/connect_by/ob_nested_loop_connect_by.h"
+#include "sql/engine/ob_exec_context.h"
+#include "sql/engine/connect_by/ob_nl_cnnt_by_with_index_op.h"
+
+namespace oceanbase {
+using namespace common;
+using namespace sql;
+namespace sql {
+
+ObExprPrior::ObExprPrior(ObIAllocator& alloc) : ObExprOperator(alloc, T_OP_PRIOR, N_NEG, 1, NOT_ROW_DIMENSION){};
+
+int ObExprPrior::calc_result_type1(ObExprResType& type, ObExprResType& type1, ObExprTypeCtx& type_ctx) const
+{
+  UNUSED(type_ctx);
+  type = type1;
+  int ret = OB_SUCCESS;
+  return ret;
+}
+
+int ObExprPrior::calc_result1(ObObj& result, const ObObj& obj, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  if (OB_ISNULL(expr_ctx.exec_ctx_)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("Got a null phy plan ctx", K(ret));
+  } else {
+    ObExecContext& exec_ctx = *expr_ctx.exec_ctx_;
+    ObPhyOperator::ObPhyOperatorCtx* op_ctx = NULL;
+    ObConnectByBase::ObConnectByBaseCtx* connect_by_ctx = NULL;
+    int64_t level = 0;
+    if (OB_ISNULL(
+            op_ctx = GET_PHY_OPERATOR_CTX(ObPhyOperator::ObPhyOperatorCtx, exec_ctx, expr_ctx.phy_operator_ctx_id_))) {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("failed to get nested loop connect by ctx", K(ret));
+    } else if (PHY_NESTED_LOOP_CONNECT_BY != op_ctx->get_op_type() &&
+               PHY_NESTED_LOOP_CONNECT_BY_WITH_INDEX != op_ctx->get_op_type()) {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("sys connect path can only generate by nestloop connect by join", K(ret), K(op_ctx->get_op_type()));
+    } else if (FALSE_IT(connect_by_ctx = static_cast<ObConnectByBase::ObConnectByBaseCtx*>(op_ctx))) {
+    } else if (FALSE_IT(level = connect_by_ctx->get_current_level())) {
+    } else {
+      result = obj;
+      if (1 == level) {
+        result.set_null();
+      }
+    }
+  }
+  return ret;
+}
+int ObExprPrior::cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
+{
+  int ret = OB_SUCCESS;
+  UNUSED(expr_cg_ctx);
+  UNUSED(raw_expr);
+  if (OB_UNLIKELY(1 != rt_expr.arg_cnt_)) {
+    ret = OB_INVALID_ARGUMENT_NUM;
+    LOG_WARN("invalid arg num", K(ret), K(rt_expr.arg_cnt_));
+  } else {
+    rt_expr.eval_func_ = calc_prior_expr;
+  }
+  return ret;
+}
+
+int ObExprPrior::calc_prior_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res)
+{
+  int ret = OB_SUCCESS;
+  uint64_t operator_id = expr.extra_;
+  ObDatum* arg_datum = nullptr;
+  ObOperatorKit* kit = ctx.exec_ctx_.get_operator_kit(operator_id);
+  if (OB_ISNULL(kit) || OB_ISNULL(kit->op_)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("operator is NULL", K(ret), K(operator_id), KP(kit));
+  } else if (OB_UNLIKELY(PHY_NESTED_LOOP_CONNECT_BY != kit->op_->get_spec().type_ &&
+                         PHY_NESTED_LOOP_CONNECT_BY_WITH_INDEX != kit->op_->get_spec().type_)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("is not connect by operator", K(ret), K(operator_id), "spec", kit->op_->get_spec());
+  } else if (OB_FAIL(expr.args_[0]->eval(ctx, arg_datum))) {
+    LOG_WARN("failed to eval expr", K(ret));
+  } else {
+    int64_t level = 0;
+    if (PHY_NESTED_LOOP_CONNECT_BY == kit->op_->get_spec().type_) {
+      ObNLConnectByOp* cnntby_op = static_cast<ObNLConnectByOp*>(kit->op_);
+      level = cnntby_op->connect_by_pump_.get_current_level();
+    } else {
+      ObNLConnectByWithIndexOp* cnntby_op = static_cast<ObNLConnectByWithIndexOp*>(kit->op_);
+      level = cnntby_op->connect_by_pump_.get_current_level();
+    }
+    if (1 == level) {
+      res.set_null();
+    } else {
+      res.set_datum(*arg_datum);
+    }
+    LOG_DEBUG("trace prior level", K(level), K(res));
+  }
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase