124 lines
3.4 KiB
C++
124 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 "sql/engine/set/ob_append.h"
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#include "common/object/ob_object.h"
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#include "sql/engine/expr/ob_expr_operator.h"
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namespace oceanbase {
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using namespace common;
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namespace sql {
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class ObAppend::ObAppendCtx : public ObPhyOperatorCtx {
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public:
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explicit ObAppendCtx(ObExecContext& ctx) : ObPhyOperatorCtx(ctx), current_child_op_idx_(0)
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{}
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~ObAppendCtx()
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{}
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virtual void destroy()
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{
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ObPhyOperatorCtx::destroy_base();
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}
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public:
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int64_t current_child_op_idx_;
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};
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ObAppend::ObAppend(common::ObIAllocator& alloc) : ObMultiChildrenPhyOperator(alloc)
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{}
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ObAppend::~ObAppend()
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{}
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void ObAppend::reset()
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{
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ObMultiChildrenPhyOperator::reset();
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}
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void ObAppend::reuse()
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{
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ObMultiChildrenPhyOperator::reuse();
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}
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int ObAppend::inner_get_next_row(ObExecContext& ctx, const ObNewRow*& row) const
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{
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int ret = OB_SUCCESS;
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ObAppendCtx* append_ctx = NULL;
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if (OB_ISNULL(append_ctx = GET_PHY_OPERATOR_CTX(ObAppendCtx, ctx, get_id()))) {
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ret = OB_ERR_NULL_VALUE;
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} else if (append_ctx->current_child_op_idx_ >= child_num_ || append_ctx->current_child_op_idx_ < 0) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("unexpected error. current child op idx is out of range", K(ret), K(append_ctx->current_child_op_idx_));
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} else if (OB_ISNULL(child_array_[append_ctx->current_child_op_idx_])) {
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ret = OB_NOT_INIT;
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LOG_WARN("child_op_ is null");
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} else if (child_array_[append_ctx->current_child_op_idx_]->is_dml_operator()) {
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ret = OB_ITER_END;
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} else {
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ret = child_array_[append_ctx->current_child_op_idx_]->get_next_row(ctx, row);
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if (OB_SUCCESS != ret && OB_ITER_END != ret) {
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LOG_WARN("fail to get next row", K(ret));
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}
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}
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return ret;
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}
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int ObAppend::get_next_row(ObExecContext& ctx, const ObNewRow*& row) const
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{
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int ret = OB_SUCCESS;
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ObAppendCtx* append_ctx = NULL;
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if (OB_ISNULL(append_ctx = GET_PHY_OPERATOR_CTX(ObAppendCtx, ctx, get_id()))) {
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ret = OB_ERR_NULL_VALUE;
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} else {
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while (true) {
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ret = inner_get_next_row(ctx, row);
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if (OB_SUCC(ret)) {
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break;
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} else if (OB_ITER_END == ret) {
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if (append_ctx->current_child_op_idx_ < child_num_ - 1) {
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++append_ctx->current_child_op_idx_;
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// go on iterating
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} else {
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// iterate ended. really.
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break;
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}
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} else {
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LOG_WARN("inner get next row failed", K(ret));
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break;
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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 ObAppend::init_op_ctx(ObExecContext& ctx) const
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{
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ObPhyOperatorCtx* op_ctx = NULL;
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UNUSED(op_ctx);
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return CREATE_PHY_OPERATOR_CTX(ObAppendCtx, ctx, get_id(), get_type(), op_ctx);
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}
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int ObAppend::inner_open(ObExecContext& ctx) const
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{
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int ret = OB_SUCCESS;
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if (OB_FAIL(init_op_ctx(ctx))) {
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LOG_WARN("init operator context failed", K(ret), K_(id));
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} else if (OB_FAIL(handle_op_ctx(ctx))) {
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LOG_WARN("handle op ctx failed", K(ret));
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}
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return ret;
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}
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} // namespace sql
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} // namespace oceanbase
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