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src/sql/optimizer/ob_log_delete.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_OPT
+#include "ob_log_delete.h"
+#include "ob_log_plan.h"
+#include "sql/optimizer/ob_optimizer_context.h"
+
+using namespace oceanbase;
+using namespace sql;
+using namespace oceanbase::common;
+
+int ObLogDelete::allocate_expr_pre(ObAllocExprContext& ctx)
+{
+  int ret = OB_SUCCESS;
+  LOG_TRACE("allocate expr pre for delete", K(is_pdml()));
+  if (OB_FAIL(add_table_columns_to_ctx(ctx))) {
+    LOG_WARN("failed to add table columns to ctx", K(ret));
+  } else if (OB_FAIL(ObLogicalOperator::allocate_expr_pre(ctx))) {
+    LOG_WARN("failed to allocate expr pre", K(ret));
+  } else if (is_pdml()) {
+    if (OB_FAIL(alloc_partition_id_expr(ctx))) {
+      LOG_WARN("failed alloc pseudo partition_id column for delete", K(ret));
+    }
+  } else { /*do nothing*/
+  }
+  return ret;
+}
+
+int ObLogDelete::allocate_expr_post(ObAllocExprContext& ctx)
+{
+  int ret = OB_SUCCESS;
+  if (is_pdml() && is_index_maintenance()) {
+    // handle shadow pk column
+    if (OB_FAIL(alloc_shadow_pk_column_for_pdml(ctx))) {
+      LOG_WARN("failed alloc generated column for pdml index maintain", K(ret));
+    }
+  }
+  if (OB_SUCC(ret)) {
+    if (OB_FAIL(ObLogicalOperator::allocate_expr_post(ctx))) {
+      LOG_WARN("failed to allocate expr post for delete", K(ret));
+    }
+  }
+  return ret;
+}
+
+const char* ObLogDelete::get_name() const
+{
+  const char* name = NULL;
+  int ret = OB_SUCCESS;
+  if (is_multi_part_dml()) {
+    name = "MULTI PARTITION DELETE";
+  } else if (is_pdml() && is_index_maintenance()) {
+    name = "INDEX DELETE";
+  } else {
+    name = ObLogDelUpd::get_name();
+  }
+  return name;
+}
+
+int ObLogDelete::est_cost()
+{
+  int ret = OB_SUCCESS;
+  ObLogicalOperator* child = NULL;
+  if (OB_ISNULL(child = get_child(ObLogicalOperator::first_child))) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("child is null", K(ret), K(child));
+  } else {
+    set_op_cost(child->get_card() * static_cast<double>(DELETE_ONE_ROW_COST));
+    set_cost(child->get_cost() + get_op_cost());
+    set_card(child->get_card());
+  }
+  return ret;
+}