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src/sql/engine/expr/ob_expr_timestamp.cpp
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279
src/sql/engine/expr/ob_expr_timestamp.cpp
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/**
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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.h"
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#include "lib/ob_name_def.h"
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#include "lib/timezone/ob_time_convert.h"
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#include "sql/engine/ob_physical_plan_ctx.h"
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#include "sql/engine/ob_exec_context.h"
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#include "share/system_variable/ob_system_variable.h"
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namespace oceanbase {
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using namespace common;
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using namespace share;
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namespace sql {
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ObExprSysTimestamp::ObExprSysTimestamp(ObIAllocator& alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_SYSTIMESTAMP, N_SYSTIMESTAMP, 0, NOT_ROW_DIMENSION)
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{}
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ObExprSysTimestamp::~ObExprSysTimestamp()
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{}
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int ObExprSysTimestamp::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_timestamp_tz();
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return OB_SUCCESS;
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}
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int ObExprSysTimestamp::calc_result0(ObObj& result, ObExprCtx& expr_ctx) const
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{
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int ret = OB_SUCCESS;
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int64_t utc_timestamp = 0;
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ObTimeZoneInfoWrap tz_info_wrap;
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const ObTimeZoneInfo* cur_tz_info = get_timezone_info(expr_ctx.my_session_);
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if (OB_ISNULL(expr_ctx.phy_plan_ctx_) || OB_ISNULL(expr_ctx.my_session_) || OB_ISNULL(cur_tz_info)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("expr_ctx.phy_plan_ctx_ or expr_ctx.my_session_ is null", K(expr_ctx.my_session_), K(cur_tz_info), K(ret));
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} else if (OB_UNLIKELY(!expr_ctx.phy_plan_ctx_->has_cur_time())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("physical plan context don't have time value", K(ret));
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} else {
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utc_timestamp = expr_ctx.phy_plan_ctx_->get_cur_time().get_datetime();
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ObString sys_time_zone;
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const ObString OLD_SERVER_SYSTIMEZONE("CST");
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if (OB_FAIL(expr_ctx.my_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 (0 == sys_time_zone.case_compare(OLD_SERVER_SYSTIMEZONE)) {
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LOG_DEBUG("sys_time_zone is CST, maybe from old server, use local value instead",
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K(sys_time_zone),
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"local value",
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ObSpecialSysVarValues::system_time_zone_str_);
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sys_time_zone = ObSpecialSysVarValues::system_time_zone_str_;
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}
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if (OB_SUCC(ret)) {
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if (OB_FAIL(tz_info_wrap.init_time_zone(
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sys_time_zone, OB_INVALID_VERSION, *(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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cur_tz_info = tz_info_wrap.get_time_zone_info();
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LOG_DEBUG("succ to get tz_info", K(sys_time_zone), K(cur_tz_info));
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}
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}
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}
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if (OB_SUCC(ret)) {
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int64_t dt_value = 0;
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int64_t odate_value = 0;
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ObOTimestampData timestamp_value;
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if (OB_FAIL(ObTimeConverter::timestamp_to_datetime(utc_timestamp, cur_tz_info, dt_value))) {
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LOG_WARN("failed to convert timestamp to datetime", K(ret));
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} else if (FALSE_IT(ObTimeConverter::datetime_to_odate(dt_value, odate_value))) {
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} else if (OB_FAIL(ObTimeConverter::odate_to_otimestamp(
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odate_value, cur_tz_info, ObTimestampTZType, timestamp_value))) {
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LOG_WARN("failed to convert timestamp to datetime", K(ret));
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} else {
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result.set_timestamp_tz(timestamp_value);
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}
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}
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return ret;
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}
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int ObExprSysTimestamp::eval_systimestamp(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
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{
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int ret = OB_SUCCESS;
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UNUSED(expr);
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int64_t utc_timestamp = 0;
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ObTimeZoneInfoWrap tz_info_wrap;
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const ObTimeZoneInfo* cur_tz_info = get_timezone_info(ctx.exec_ctx_.get_my_session());
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if (OB_ISNULL(ctx.exec_ctx_.get_physical_plan_ctx()) || OB_ISNULL(ctx.exec_ctx_.get_my_session()) ||
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OB_ISNULL(cur_tz_info)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("phy_plan_ctx_ or my_session_ or cur_tz_info is null",
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"phy_plan_ctx",
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ctx.exec_ctx_.get_physical_plan_ctx(),
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K(cur_tz_info),
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K(ret));
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} else if (OB_UNLIKELY(!ctx.exec_ctx_.get_physical_plan_ctx()->has_cur_time())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("physical plan context don't have current time value");
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} else {
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utc_timestamp = ctx.exec_ctx_.get_physical_plan_ctx()->get_cur_time().get_datetime();
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ObString sys_time_zone;
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const ObString OLD_SERVER_SYSTIMEZONE("CST");
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if (OB_FAIL(ctx.exec_ctx_.get_my_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 (0 == sys_time_zone.case_compare(OLD_SERVER_SYSTIMEZONE)) {
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LOG_DEBUG("sys_time_zone is CST, maybe from old server, use local value instead",
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K(sys_time_zone),
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"local value",
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ObSpecialSysVarValues::system_time_zone_str_);
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sys_time_zone = ObSpecialSysVarValues::system_time_zone_str_;
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}
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if (OB_SUCC(ret)) {
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if (OB_FAIL(tz_info_wrap.init_time_zone(
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sys_time_zone, OB_INVALID_VERSION, *(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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cur_tz_info = tz_info_wrap.get_time_zone_info();
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LOG_DEBUG("succ to get tz_info", K(sys_time_zone), K(cur_tz_info));
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}
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}
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}
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if (OB_SUCC(ret)) {
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int64_t dt_value = 0;
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int64_t odate_value = 0;
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ObOTimestampData timestamp_value;
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if (OB_FAIL(ObTimeConverter::timestamp_to_datetime(utc_timestamp, cur_tz_info, dt_value))) {
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LOG_WARN("failed to convert timestamp to datetime", K(ret));
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} else if (FALSE_IT(ObTimeConverter::datetime_to_odate(dt_value, odate_value))) {
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} else if (OB_FAIL(ObTimeConverter::odate_to_otimestamp(
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odate_value, cur_tz_info, ObTimestampTZType, timestamp_value))) {
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LOG_WARN("failed to convert timestamp to datetime", K(ret));
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} else {
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expr_datum.set_otimestamp_tz(timestamp_value);
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}
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}
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return ret;
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}
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int ObExprSysTimestamp::cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
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{
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UNUSED(raw_expr);
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UNUSED(op_cg_ctx);
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rt_expr.eval_func_ = ObExprSysTimestamp::eval_systimestamp;
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return OB_SUCCESS;
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}
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ObExprLocalTimestamp::ObExprLocalTimestamp(ObIAllocator& alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_LOCALTIMESTAMP, N_LOCALTIMESTAMP, 0, NOT_ROW_DIMENSION)
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{}
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ObExprLocalTimestamp::~ObExprLocalTimestamp()
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{}
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int ObExprLocalTimestamp::calc_result_type0(ObExprResType& type, ObExprTypeCtx& type_ctx) const
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{
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// https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions079.htm
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UNUSED(type_ctx);
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type.set_timestamp_nano();
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return OB_SUCCESS;
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}
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int ObExprLocalTimestamp::calc_result0(ObObj& result, ObExprCtx& expr_ctx) const
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{
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int ret = OB_SUCCESS;
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if (OB_ISNULL(expr_ctx.phy_plan_ctx_) || OB_ISNULL(expr_ctx.my_session_)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("expr_ctx.phy_plan_ctx_ or expr_ctx.my_session_ is null", K(ret));
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} else if (OB_UNLIKELY(!expr_ctx.phy_plan_ctx_->has_cur_time())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("physical plan context don't have curr time value");
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} else {
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int64_t utc_value = expr_ctx.phy_plan_ctx_->get_cur_time_tardy_value();
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int64_t dt_value = 0;
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int64_t odate_value = 0;
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ObOTimestampData ts_value;
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if (OB_FAIL(ObTimeConverter::timestamp_to_datetime(utc_value,
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get_timezone_info(expr_ctx.my_session_), // TODO:change this to sys timezone
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dt_value))) {
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LOG_WARN("failed to convert timestamp to datetime", K(ret));
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} else if (FALSE_IT(ObTimeConverter::trunc_datetime(result_type_.get_scale(), dt_value))) {
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} else if (FALSE_IT(ObTimeConverter::datetime_to_odate(dt_value, odate_value))) {
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} else if (OB_FAIL(ObTimeConverter::odate_to_otimestamp(odate_value,
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get_timezone_info(expr_ctx.my_session_), // TODO:change this to sys timezone
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ObTimestampNanoType,
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ts_value))) {
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LOG_WARN("failed to convert timestamp to datetime", K(ret));
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} else {
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result.set_otimestamp_value(ObTimestampNanoType, ts_value);
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}
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}
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return ret;
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}
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int ObExprLocalTimestamp::eval_localtimestamp(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
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{
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int ret = OB_SUCCESS;
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UNUSED(expr);
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if (OB_ISNULL(ctx.exec_ctx_.get_physical_plan_ctx()) || OB_ISNULL(ctx.exec_ctx_.get_my_session())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("phy_plan_ctx_ or my_session_ or cur_tz_info is null",
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"phy_plan_ctx",
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ctx.exec_ctx_.get_physical_plan_ctx(),
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K(ret));
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} else if (OB_UNLIKELY(!ctx.exec_ctx_.get_physical_plan_ctx()->has_cur_time())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("physical plan context don't have current time value");
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} else {
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int64_t utc_value = ctx.exec_ctx_.get_physical_plan_ctx()->get_cur_time_tardy_value();
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int64_t dt_value = 0;
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int64_t odate_value = 0;
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ObOTimestampData ts_value;
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if (OB_FAIL(ObTimeConverter::timestamp_to_datetime(
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utc_value, get_timezone_info(ctx.exec_ctx_.get_my_session()), dt_value))) {
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LOG_WARN("failed to convert timestamp to datetime", K(ret));
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} else if (FALSE_IT(ObTimeConverter::trunc_datetime(expr.datum_meta_.scale_, dt_value))) {
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} else if (FALSE_IT(ObTimeConverter::datetime_to_odate(dt_value, odate_value))) {
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} else if (OB_FAIL(ObTimeConverter::odate_to_otimestamp(
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odate_value, get_timezone_info(ctx.exec_ctx_.get_my_session()), ObTimestampNanoType, ts_value))) {
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LOG_WARN("failed to convert timestamp to datetime", K(ret));
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} else {
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expr_datum.set_otimestamp_tiny(ts_value);
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}
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}
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return ret;
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}
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int ObExprLocalTimestamp::cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
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{
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UNUSED(raw_expr);
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UNUSED(op_cg_ctx);
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rt_expr.eval_func_ = ObExprLocalTimestamp::eval_localtimestamp;
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return OB_SUCCESS;
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}
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int ObExprToTimestamp::set_my_result_from_ob_time(ObExprCtx& expr_ctx, ObTime& ob_time, common::ObObj& result) const
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{
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int ret = OB_SUCCESS;
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UNUSED(expr_ctx);
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ObOTimestampData result_value;
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if (OB_FAIL(ObTimeConverter::ob_time_to_otimestamp(ob_time, result_value))) {
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LOG_WARN("failed to convert ob time to datetime", K(ret));
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} else {
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result.set_otimestamp_value(get_my_target_obj_type(), result_value);
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result.set_scale(MAX_SCALE_FOR_ORACLE_TEMPORAL);
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}
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return ret;
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}
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int ObExprToTimestampTZ::set_my_result_from_ob_time(ObExprCtx& expr_ctx, ObTime& ob_time, common::ObObj& result) const
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{
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int ret = OB_SUCCESS;
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ObTimeConvertCtx time_cvrt_ctx(get_timezone_info(expr_ctx.my_session_), false);
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ObOTimestampData result_value;
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if (OB_FAIL(ObTimeConverter::ob_time_to_utc(ObTimestampTZType, time_cvrt_ctx, ob_time))) {
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LOG_WARN("failed to convert ob_time to utc", K(ret));
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} else if (OB_FAIL(ObTimeConverter::ob_time_to_otimestamp(ob_time, result_value))) {
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LOG_WARN("failed to convert ob time to datetime", K(ret));
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} else {
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result.set_otimestamp_value(get_my_target_obj_type(), result_value);
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result.set_scale(MAX_SCALE_FOR_ORACLE_TEMPORAL);
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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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