144 lines
3.4 KiB
C++
144 lines
3.4 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#define USING_LOG_PREFIX SQL_ENG
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#include "ob_count_op.h"
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#include "sql/engine/ob_physical_plan.h"
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#include "sql/engine/ob_exec_context.h"
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namespace oceanbase {
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namespace sql {
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ObCountSpec::ObCountSpec(ObIAllocator& alloc, const ObPhyOperatorType type)
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: ObOpSpec(alloc, type), rownum_limit_(NULL), anti_monotone_filters_(alloc)
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{}
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OB_SERIALIZE_MEMBER((ObCountSpec, ObOpSpec), rownum_limit_, anti_monotone_filters_);
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ObCountOp::ObCountOp(ObExecContext& exec_ctx, const ObOpSpec& spec, ObOpInput* input)
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: ObOperator(exec_ctx, spec, input)
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{
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reset_default();
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}
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void ObCountOp::reset_default()
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{
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cur_rownum_ = 0;
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rownum_limit_ = INT64_MAX;
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}
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int ObCountOp::inner_open()
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{
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int ret = OB_SUCCESS;
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if (OB_ISNULL(child_)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("count operator has no child", K(ret));
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} else if (OB_FAIL(get_rownum_limit())) {
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LOG_WARN("get rownum limit failed", K(ret));
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}
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return ret;
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}
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int ObCountOp::get_rownum_limit()
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{
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int ret = OB_SUCCESS;
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ObExpr* expr = MY_SPEC.rownum_limit_;
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if (NULL != expr) {
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ObDatum* datum = NULL;
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if (OB_FAIL(expr->eval(eval_ctx_, datum))) {
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LOG_WARN("limit expr evaluate failed", K(ret));
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} else {
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if (datum->null_) {
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rownum_limit_ = 0;
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} else {
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OB_ASSERT(ob_is_int_tc(expr->datum_meta_.type_));
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rownum_limit_ = *datum->int_;
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}
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}
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}
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return ret;
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}
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int ObCountOp::rescan()
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{
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int ret = OB_SUCCESS;
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if (OB_FAIL(ObOperator::rescan())) {
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if (OB_ITER_END != ret) {
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LOG_WARN("operator rescan fail", K(ret));
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}
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} else {
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reset_default();
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OZ(get_rownum_limit());
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}
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return ret;
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}
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int ObCountOp::switch_iterator()
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{
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int ret = OB_SUCCESS;
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if (OB_FAIL(ObOperator::switch_iterator())) {
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if (OB_ITER_END != ret) {
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LOG_WARN("operator switch iterator fail", K(ret));
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}
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} else {
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reset_default();
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OZ(get_rownum_limit());
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}
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return ret;
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}
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int ObCountOp::get_next_row()
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{
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int ret = OB_SUCCESS;
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if (cur_rownum_ >= rownum_limit_) {
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ret = OB_ITER_END;
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} else {
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cur_rownum_ += 1;
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if (OB_FAIL(ObOperator::get_next_row())) {
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cur_rownum_ -= 1;
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if (OB_ITER_END != ret) {
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LOG_WARN("operator get next row failed", K(ret));
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}
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}
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}
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return ret;
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}
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int ObCountOp::inner_get_next_row()
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{
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int ret = OB_SUCCESS;
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if (OB_FAIL(child_->get_next_row())) {
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if (OB_ITER_END != ret) {
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LOG_WARN("get row from child failed", K(ret));
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}
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} else {
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clear_evaluated_flag();
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if (!MY_SPEC.anti_monotone_filters_.empty()) {
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bool filtered = false;
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if (OB_FAIL(filter(MY_SPEC.anti_monotone_filters_, filtered))) {
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LOG_WARN("filter row failed", K(ret));
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} else if (filtered) {
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// Set rownum limit to zero make it return OB_ITER_END directly on next call.
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rownum_limit_ = 0;
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ret = OB_ITER_END;
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}
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}
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}
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return ret;
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}
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} // end namespace sql
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} // end namespace oceanbase
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