89 lines
2.9 KiB
C++
89 lines
2.9 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/expr/ob_expr_rownum.h"
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#include "sql/engine/basic/ob_count_op.h"
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#include "sql/engine/ob_exec_context.h"
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#include "sql/code_generator/ob_static_engine_expr_cg.h"
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#include "sql/engine/expr/ob_expr_util.h"
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namespace oceanbase
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{
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using namespace common;
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namespace sql
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{
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OB_SERIALIZE_MEMBER((ObExprRowNum, ObFuncExprOperator), operator_id_);
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ObExprRowNum::ObExprRowNum(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_ROWNUM, "rownum", 0, NOT_VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION),
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operator_id_(OB_INVALID_ID)
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{
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}
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ObExprRowNum::~ObExprRowNum()
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{
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}
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int ObExprRowNum::calc_result_type0(ObExprResType &type, ObExprTypeCtx &type_ctx) const
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{
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UNUSED(type_ctx);
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type.set_number();
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type.set_scale(ObAccuracy::DDL_DEFAULT_ACCURACY[ObNumberType].scale_);
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type.set_precision(ObAccuracy::DDL_DEFAULT_ACCURACY[ObNumberType].precision_);
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return OB_SUCCESS;
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}
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int ObExprRowNum::cg_expr(ObExprCGCtx &op_cg_ctx,
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const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const
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{
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int ret = OB_SUCCESS;
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UNUSED(raw_expr);
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UNUSED(op_cg_ctx);
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rt_expr.extra_ = operator_id_;
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rt_expr.eval_func_ = &rownum_eval;
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return ret;
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}
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int ObExprRowNum::rownum_eval(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum)
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{
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int ret = OB_SUCCESS;
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uint64_t operator_id = expr.extra_;
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ObOperatorKit *kit = ctx.exec_ctx_.get_operator_kit(operator_id);
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if (OB_UNLIKELY(OB_INVALID_ID == operator_id)) {
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ret = OB_ERR_CBY_PSEUDO_COLUMN_NOT_ALLOWED;
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LOG_USER_ERROR(OB_NOT_SUPPORTED, "Usage of rownum is");
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} else if (OB_ISNULL(kit) || OB_ISNULL(kit->op_)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("operator is NULL", K(ret), K(operator_id), KP(kit));
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} else if (OB_UNLIKELY(PHY_COUNT != kit->op_->get_spec().type_)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("is not count operator", K(ret), K(operator_id), "spec", kit->op_->get_spec());
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} else {
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char local_buff[number::ObNumber::MAX_BYTE_LEN];
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ObDataBuffer local_alloc(local_buff, number::ObNumber::MAX_BYTE_LEN);
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number::ObNumber num;
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ObCountOp *count_op = static_cast<ObCountOp *>(kit->op_);
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if (OB_FAIL(num.from(count_op->get_cur_rownum(), local_alloc))) {
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LOG_WARN("failed to convert int to number", K(ret));
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} else {
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expr_datum.set_number(num);
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}
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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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