120 lines
4.5 KiB
C++
120 lines
4.5 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_timestamp_to_scn.h"
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#include "lib/ob_name_def.h"
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#include "sql/engine/expr/ob_expr_util.h"
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#include "sql/engine/expr/ob_datum_cast.h"
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#include "sql/engine/ob_exec_context.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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ObExprTimestampToScn::ObExprTimestampToScn(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_TIMESTAMP_TO_SCN, N_TIMESTAMP_TO_SCN, 1, NOT_VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
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{
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}
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ObExprTimestampToScn::~ObExprTimestampToScn()
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{
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}
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int ObExprTimestampToScn::calc_result_type1(ObExprResType &type,
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ObExprResType &time,
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ObExprTypeCtx &type_ctx) const
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{
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UNUSED(type_ctx);
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int ret = OB_SUCCESS;
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if (lib::is_oracle_mode()) {
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type.set_number();
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type.set_scale(DEFAULT_SCALE_FOR_INTEGER);
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//set calc type
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time.set_calc_type(ObTimestampNanoType);
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} else {
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type.set_uint64();
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type.set_precision(ObAccuracy::MAX_ACCURACY[ObUInt64Type].precision_);
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type.set_scale(ObAccuracy::MAX_ACCURACY[ObUInt64Type].scale_);
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type_ctx.set_cast_mode(type_ctx.get_cast_mode() & (~(CM_WARN_ON_FAIL)));
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//set calc type
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time.set_calc_type(ObDateTimeType);
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}
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return ret;
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}
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int calc_timestamp_to_scn_expr(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res_datum)
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{
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int ret = OB_SUCCESS;
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ObDatum *in_datum = NULL;
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ObString sys_time_zone;
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ObTimeZoneInfoWrap tz_info_wrap;
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const ObBasicSessionInfo *session = ctx.exec_ctx_.get_my_session();
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const ObTimeZoneInfo *cur_tz_info = NULL;
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if (OB_ISNULL(session) || OB_ISNULL(cur_tz_info = session->get_timezone_info())) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN(" session or tz_info is null", KP(session), KP(cur_tz_info), K(ret));
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} else if (OB_FAIL(expr.args_[0]->eval(ctx, in_datum))) {
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LOG_WARN("eval arg failed", K(ret));
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} else if (OB_ISNULL(in_datum)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("in_datum is NULL", K(expr), K(ret));
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} else if (in_datum->is_null()) {
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ret = lib::is_oracle_mode() ? OB_ERR_FETCH_COLUMN_NULL : OB_INVALID_ARGUMENT_FOR_TIMESTAMP_TO_SCN;
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} else if (OB_FAIL(session->get_sys_variable(share::SYS_VAR_SYSTEM_TIME_ZONE, sys_time_zone))) {
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LOG_WARN("Get sys variable error", K(ret));
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} else if (OB_FAIL(tz_info_wrap.init_time_zone(sys_time_zone,
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OB_INVALID_VERSION,
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*(const_cast<ObTZInfoMap *>(cur_tz_info->get_tz_info_map()))))) {
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LOG_WARN("tz_info_wrap init_time_zone fail", KR(ret), K(sys_time_zone));
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} else {
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uint64_t scn_value = palf::LOG_INVALID_LSN_VAL;
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const ObTimeZoneInfo *sys_tz_info = tz_info_wrap.get_time_zone_info();
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if (lib::is_oracle_mode()) {
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ObNumStackOnceAlloc tmp_alloc;
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number::ObNumber number;
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ObOTimestampData timestamp_value = in_datum->get_otimestamp_tiny();
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if (OB_FAIL(ObTimeConverter::otimestamp_to_scn_value(timestamp_value, sys_tz_info, scn_value))) {
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LOG_WARN("failed to convert otimestamp to scn_val", K(ret), K(timestamp_value));
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} else if (OB_FAIL(number.from(scn_value, tmp_alloc))) {
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LOG_WARN("number.from failed", K(ret), K(scn_value));
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} else {
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res_datum.set_number(number);
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}
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} else {
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const int64_t datetime_value = in_datum->get_datetime();
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if (OB_FAIL(ObTimeConverter::datetime_to_scn_value(datetime_value, sys_tz_info, scn_value))) {
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LOG_WARN("failed to convert datetime to scn_val", K(ret), K(datetime_value));
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} else {
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res_datum.set_uint(scn_value);
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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 ObExprTimestampToScn::cg_expr(ObExprCGCtx &expr_cg_ctx, 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(expr_cg_ctx);
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UNUSED(raw_expr);
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rt_expr.eval_func_ = calc_timestamp_to_scn_expr;
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return ret;
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}
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}//end of namespace sql
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}//end of namespace oceanbase
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