4108e781d4
Co-authored-by: xianyu-w <707512433@qq.com> Co-authored-by: sdc <njucssdc@gmail.com> Co-authored-by: seuwebber <webber_code@163.com>
97 lines
3.1 KiB
C++
97 lines
3.1 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_current_scn.h"
|
|
#include "lib/ob_name_def.h"
|
|
#include "sql/session/ob_sql_session_info.h"
|
|
#include "sql/engine/ob_physical_plan_ctx.h"
|
|
#include "sql/engine/ob_exec_context.h"
|
|
#include "src/sql/engine/expr/ob_expr_util.h"
|
|
|
|
namespace oceanbase
|
|
{
|
|
using namespace common;
|
|
using namespace share;
|
|
using namespace transaction;
|
|
#include "src/storage/tx/ob_tx_api.h"
|
|
namespace sql
|
|
{
|
|
ObExprCurrentScn::ObExprCurrentScn(ObIAllocator &alloc)
|
|
: ObFuncExprOperator(alloc, T_FUN_SYS_CURRENT_SCN, N_CURRENT_SCN, 0, NOT_VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
|
|
{
|
|
}
|
|
ObExprCurrentScn::~ObExprCurrentScn()
|
|
{
|
|
}
|
|
|
|
int ObExprCurrentScn::calc_result_type0(ObExprResType &type, ObExprTypeCtx &type_ctx) const
|
|
{
|
|
UNUSED(type_ctx);
|
|
if (is_oracle_mode()) {
|
|
const ObAccuracy &acc = ObAccuracy::DDL_DEFAULT_ACCURACY2[common::ORACLE_MODE][common::ObNumberType];
|
|
type.set_number();
|
|
type.set_scale(acc.get_scale());
|
|
type.set_precision(acc.get_precision());
|
|
} else {
|
|
const ObAccuracy &acc = common::ObAccuracy::DDL_DEFAULT_ACCURACY[common::ObUInt64Type];
|
|
type.set_uint64();
|
|
type.set_scale(acc.get_scale());
|
|
type.set_precision(acc.get_precision());
|
|
type.set_result_flag(NOT_NULL_FLAG);
|
|
}
|
|
return OB_SUCCESS;
|
|
}
|
|
|
|
int ObExprCurrentScn::eval_current_scn(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum)
|
|
{
|
|
int ret = OB_SUCCESS;
|
|
ObSQLSessionInfo *session = NULL;
|
|
if (OB_ISNULL(session = ctx.exec_ctx_.get_my_session())) {
|
|
ret = OB_ERR_UNEXPECTED;
|
|
LOG_WARN("session is null", K(ret));
|
|
} else {
|
|
share::SCN current_scn;
|
|
ObTransService *txs = MTL(transaction::ObTransService*);
|
|
int64_t query_timeout = 0;
|
|
session->get_query_timeout(query_timeout);
|
|
int64_t expire_ts = session->get_query_start_time() + query_timeout;
|
|
if (OB_FAIL(txs->get_read_snapshot_version(expire_ts, current_scn))) {
|
|
LOG_WARN("get read snapshot version", K(ret));
|
|
} else if (ObUInt64Type == expr.datum_meta_.type_) {
|
|
expr_datum.set_uint(current_scn.get_val_for_sql());
|
|
} else {
|
|
uint64_t scn_version = current_scn.get_val_for_sql();
|
|
ObNumStackOnceAlloc tmp_alloc;
|
|
number::ObNumber num;
|
|
if (OB_FAIL(num.from(scn_version, tmp_alloc))) {
|
|
LOG_WARN("copy number fail", K(ret));
|
|
} else {
|
|
expr_datum.set_number(num);
|
|
}
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int ObExprCurrentScn::cg_expr(ObExprCGCtx &op_cg_ctx, const ObRawExpr &raw_expr,
|
|
ObExpr &rt_expr) const
|
|
{
|
|
UNUSED(raw_expr);
|
|
UNUSED(op_cg_ctx);
|
|
rt_expr.eval_func_ = ObExprCurrentScn::eval_current_scn;
|
|
return OB_SUCCESS;
|
|
}
|
|
|
|
} //namespace sql
|
|
} //namespace oceanbase
|