95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
/**
|
|
* 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_ENG
|
|
#include "sql/engine/expr/ob_expr_prior.h"
|
|
#include "share/object/ob_obj_cast.h"
|
|
#include "sql/engine/expr/ob_expr_result_type_util.h"
|
|
#include "sql/session/ob_sql_session_info.h"
|
|
#include "sql/engine/ob_exec_context.h"
|
|
#include "sql/engine/connect_by/ob_nl_cnnt_by_with_index_op.h"
|
|
|
|
namespace oceanbase
|
|
{
|
|
using namespace common;
|
|
using namespace sql;
|
|
namespace sql
|
|
{
|
|
|
|
ObExprPrior::ObExprPrior(ObIAllocator &alloc)
|
|
: ObExprOperator(alloc, T_OP_PRIOR, N_NEG, 1, NOT_VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION) {
|
|
};
|
|
|
|
int ObExprPrior::calc_result_type1(ObExprResType &type, ObExprResType &type1, ObExprTypeCtx &type_ctx) const
|
|
{
|
|
UNUSED(type_ctx);
|
|
type = type1;
|
|
int ret = OB_SUCCESS;
|
|
return ret;
|
|
}
|
|
|
|
int ObExprPrior::cg_expr(
|
|
ObExprCGCtx &expr_cg_ctx,
|
|
const ObRawExpr &raw_expr,
|
|
ObExpr &rt_expr) const
|
|
{
|
|
int ret = OB_SUCCESS;
|
|
UNUSED(expr_cg_ctx);
|
|
UNUSED(raw_expr);
|
|
if (OB_UNLIKELY(1 != rt_expr.arg_cnt_)) {
|
|
ret = OB_INVALID_ARGUMENT_NUM;
|
|
LOG_WARN("invalid arg num", K(ret), K(rt_expr.arg_cnt_));
|
|
} else {
|
|
rt_expr.eval_func_ = calc_prior_expr;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int ObExprPrior::calc_prior_expr(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
|
|
{
|
|
int ret = OB_SUCCESS;
|
|
uint64_t operator_id = expr.extra_;
|
|
ObDatum *arg_datum = nullptr;
|
|
ObOperatorKit *kit = ctx.exec_ctx_.get_operator_kit(operator_id);
|
|
if (OB_ISNULL(kit) || OB_ISNULL(kit->op_)) {
|
|
ret = OB_ERR_UNEXPECTED;
|
|
LOG_WARN("operator is NULL", K(ret), K(operator_id), KP(kit));
|
|
} else if (OB_UNLIKELY(PHY_NESTED_LOOP_CONNECT_BY != kit->op_->get_spec().type_
|
|
&& PHY_NESTED_LOOP_CONNECT_BY_WITH_INDEX != kit->op_->get_spec().type_)) {
|
|
ret = OB_ERR_UNEXPECTED;
|
|
LOG_WARN("is not connect by operator", K(ret), K(operator_id), "spec", kit->op_->get_spec());
|
|
} else if (OB_FAIL(expr.args_[0]->eval(ctx, arg_datum))) {
|
|
LOG_WARN("failed to eval expr", K(ret));
|
|
} else {
|
|
int64_t level = 0;
|
|
if (PHY_NESTED_LOOP_CONNECT_BY == kit->op_->get_spec().type_) {
|
|
ObNLConnectByOp *cnntby_op = static_cast<ObNLConnectByOp *>(kit->op_);
|
|
level = cnntby_op->connect_by_pump_.get_current_level();
|
|
} else {
|
|
ObNLConnectByWithIndexOp *cnntby_op = static_cast<ObNLConnectByWithIndexOp *>(kit->op_);
|
|
level = cnntby_op->connect_by_pump_.get_current_level();
|
|
}
|
|
if (1 == level) {
|
|
res.set_null();
|
|
} else {
|
|
res.set_datum(*arg_datum);
|
|
}
|
|
LOG_DEBUG("trace prior level", K(level), K(res));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
|