init push

src/sql/optimizer/ob_log_count.cpp

@@ -0,0 +1,227 @@
+/**
+ * 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 "sql/optimizer/ob_log_count.h"
+#include "sql/optimizer/ob_optimizer_util.h"
+#include "sql/optimizer/ob_opt_est_cost.h"
+#include "sql/optimizer/ob_log_plan.h"
+#include "sql/rewrite/ob_transform_utils.h"
+using namespace oceanbase::sql;
+using namespace oceanbase::common;
+using namespace oceanbase::sql::log_op_def;
+
+namespace oceanbase {
+namespace sql {
+int ObLogCount::copy_without_child(ObLogicalOperator*& out)
+{
+  int ret = OB_SUCCESS;
+  out = NULL;
+  ObLogicalOperator* op = NULL;
+  ObLogCount* count = NULL;
+  if (OB_FAIL(clone(op))) {
+    LOG_WARN("failed to clone child operator", K(ret));
+  } else if (OB_ISNULL(count = static_cast<ObLogCount*>(op))) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("NULL ptr", K(count), K(ret));
+  } else {
+    count->set_rownum_limit_expr(rownum_limit_expr_);
+    out = count;
+  }
+  return ret;
+}
+
+int ObLogCount::allocate_exchange_post(AllocExchContext* ctx)
+{
+  int ret = OB_SUCCESS;
+  bool is_basic = false;
+  ObExchangeInfo exch_info;
+  ObLogicalOperator* exchange_point = NULL;
+  bool should_push_limit = (get_filter_exprs().count() == 0 && NULL != rownum_limit_expr_);
+  if (OB_ISNULL(ctx)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("get unexpected null", K(ctx), K(ret));
+  } else if (OB_FAIL(compute_basic_sharding_info(ctx, is_basic))) {
+    LOG_WARN("failed to compute basic sharding info", K(ret));
+  } else if (is_basic) {
+    LOG_TRACE("is basic sharding info", K(sharding_info_));
+  } else if (OB_FAIL(push_down_limit(ctx, rownum_limit_expr_, NULL, should_push_limit, false, exchange_point))) {
+    LOG_WARN("failed to push down limit", K(ret));
+  } else if (OB_ISNULL(exchange_point)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("get unexpected null", K(exchange_point), K(ret));
+  } else if (OB_FAIL(exchange_point->allocate_exchange_nodes_below(first_child, *ctx, exch_info))) {
+    LOG_WARN("failed to allocate exchange nodes below", K(ret));
+  } else {
+    sharding_info_.set_location_type(OB_TBL_LOCATION_LOCAL);
+  }
+  return ret;
+}
+
+int ObLogCount::generate_link_sql_pre(GenLinkStmtContext& link_ctx)
+{
+  int ret = OB_SUCCESS;
+  ObLinkStmt* link_stmt = link_ctx.link_stmt_;
+  if (OB_ISNULL(link_stmt) || !link_stmt->is_inited()) {
+    // do nothing.
+  } else if (dblink_id_ != link_ctx.dblink_id_) {
+    link_ctx.dblink_id_ = OB_INVALID_ID;
+    link_ctx.link_stmt_ = NULL;
+  } else if (OB_FAIL(link_stmt->try_fill_select_strs(output_exprs_))) {
+    LOG_WARN("failed to fill link stmt select strs", K(ret), K(output_exprs_));
+  } else if (OB_FAIL(link_stmt->fill_where_rownum(rownum_limit_expr_))) {
+    LOG_WARN("failed to fill link stmt where rownum", K(ret));
+  }
+  return ret;
+}
+
+uint64_t ObLogCount::hash(uint64_t seed) const
+{
+  uint64_t hash_value = seed;
+  hash_value = ObOptimizerUtil::hash_expr(rownum_limit_expr_, hash_value);
+  hash_value = ObLogicalOperator::hash(hash_value);
+
+  return hash_value;
+}
+
+int ObLogCount::set_limit_size()
+{
+  int ret = OB_SUCCESS;
+  double limit_count_double = 0.0;
+  double child_card = 0.0;
+  if (OB_ISNULL(get_child(first_child)) || OB_ISNULL(get_plan())) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("Limit's child not expected to be NULL", K(ret));
+  } else if (FALSE_IT(child_card = get_child(first_child)->get_card())) {
+    /*do nothing*/
+  } else if (NULL == rownum_limit_expr_) {
+    limit_count_double = static_cast<double>(child_card);
+  } else if (rownum_limit_expr_->has_flag(CNT_EXEC_PARAM)) {
+    limit_count_double = static_cast<double>(child_card);
+  } else {
+    int64_t limit_count = 0;
+    bool is_null_value = false;
+    if (OB_FAIL(ObTransformUtils::get_limit_value(rownum_limit_expr_,
+            get_plan()->get_stmt(),
+            get_plan()->get_optimizer_context().get_params(),
+            get_plan()->get_optimizer_context().get_session_info(),
+            &get_plan()->get_optimizer_context().get_allocator(),
+            limit_count,
+            is_null_value))) {
+      LOG_WARN("Get limit count num error", K(ret));
+    } else if (limit_count < 0) {
+      limit_count_double = 0.0;
+    } else if (limit_count >= child_card) {
+      limit_count_double = static_cast<double>(child_card);
+    } else {
+      limit_count_double = static_cast<double>(limit_count);
+    }
+  }
+
+  if (OB_SUCC(ret) && limit_count_double < child_card) {
+    bool re_est = false;
+    if (OB_FAIL(get_child(first_child)->re_est_cost(this, limit_count_double, re_est))) {
+      LOG_WARN("Failed to re est cost", K(limit_count_double), K(ret));
+    }
+  }
+
+  if (OB_SUCC(ret)) {
+    double op_cost = ObOptEstCost::cost_count(get_child(first_child)->get_card());
+    set_card(limit_count_double);
+    set_op_cost(op_cost);
+    set_cost(get_child(first_child)->get_cost() + op_cost);
+    set_width(get_child(first_child)->get_width() + 4);
+  }
+  return ret;
+}
+
+int ObLogCount::re_est_cost(const ObLogicalOperator* parent, double need_row_count, bool& re_est)
+{
+  int ret = OB_SUCCESS;
+  UNUSED(parent);
+  re_est = false;
+  if (OB_UNLIKELY(need_row_count < 0.0)) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("Need row count should not less than 0", K(ret));
+  } else if (need_row_count < get_card()) {
+    set_card(need_row_count);
+    ObLogicalOperator* child = NULL;
+    if (OB_ISNULL(child = get_child(first_child))) {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("Count's child not expected to be NULL", K(ret));
+    } else if (OB_FAIL(child->re_est_cost(this, need_row_count, re_est))) {
+      LOG_WARN("Failed to re_est child cost", K(ret));
+    } else {
+      re_est = true;
+      double op_cost = ObOptEstCost::cost_count(get_card());
+      set_op_cost(op_cost);
+      set_cost(child->get_cost() + op_cost);
+    }
+  }
+  return ret;
+}
+
+int ObLogCount::check_output_dep_specific(ObRawExprCheckDep& checker)
+{
+  int ret = OB_SUCCESS;
+  if (NULL != rownum_limit_expr_) {
+    if (OB_FAIL(checker.check(*rownum_limit_expr_))) {
+      LOG_WARN("failed to check limit_count_", K(*rownum_limit_expr_), K(ret));
+    }
+  } else { /* Do nothing */
+  }
+  return ret;
+}
+
+int ObLogCount::allocate_expr_pre(ObAllocExprContext& ctx)
+{
+  int ret = OB_SUCCESS;
+  if (OB_FAIL(ObLogicalOperator::allocate_expr_pre(ctx))) {
+    LOG_WARN("failed to add exprs to ctx", K(ret));
+  } else {
+    for (int64_t i = 0; OB_SUCC(ret) && i < ctx.expr_producers_.count(); ++i) {
+      ExprProducer& producer = ctx.expr_producers_.at(i);
+      if (OB_ISNULL(producer.expr_)) {
+        ret = OB_ERR_UNEXPECTED;
+        LOG_WARN("get unexpected null", K(ret));
+      } else if (OB_INVALID_ID == producer.producer_id_ && producer.expr_->has_flag(IS_ROWNUM)) {
+        producer.producer_id_ = id_;
+      } else { /*do nothing*/
+      }
+    }
+  }
+  return ret;
+}
+
+int ObLogCount::print_my_plan_annotation(char* buf, int64_t& buf_len, int64_t& pos, ExplainType type)
+{
+  int ret = OB_SUCCESS;
+  if (NULL != rownum_limit_expr_) {
+    if (OB_FAIL(BUF_PRINTF(", "))) {
+      LOG_WARN("BUF_PRINTF fails", K(ret));
+    } else {
+      EXPLAIN_PRINT_EXPR(rownum_limit_expr_, type);
+    }
+  }
+  return ret;
+}
+
+int ObLogCount::inner_append_not_produced_exprs(ObRawExprUniqueSet& raw_exprs) const
+{
+  int ret = OB_SUCCESS;
+  OZ(raw_exprs.append(rownum_limit_expr_));
+
+  return ret;
+}
+
+} /* namespace sql */
+} /* namespace oceanbase */