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oceanbase/src/sql/engine/expr/ob_expr_timestamp.cpp
wangzelin.wzl 93a1074b0c patch 4.0
2022-10-24 17:57:12 +08:00

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/**
* 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_timestamp.h"
#include "lib/ob_name_def.h"
#include "lib/timezone/ob_time_convert.h"
#include "sql/engine/ob_physical_plan_ctx.h"
#include "sql/engine/ob_exec_context.h"
#include "share/system_variable/ob_system_variable.h"
namespace oceanbase
{
using namespace common;
using namespace share;
namespace sql
{
ObExprSysTimestamp::ObExprSysTimestamp(ObIAllocator &alloc)
: ObFuncExprOperator(alloc, T_FUN_SYS_SYSTIMESTAMP, N_SYSTIMESTAMP, 0, NOT_ROW_DIMENSION)
{
}
ObExprSysTimestamp::~ObExprSysTimestamp()
{
}
int ObExprSysTimestamp::calc_result_type0(ObExprResType &type, ObExprTypeCtx &type_ctx) const
{
UNUSED(type_ctx);
type.set_timestamp_tz();
return OB_SUCCESS;
}
int ObExprSysTimestamp::eval_systimestamp(const ObExpr &expr, ObEvalCtx &ctx,
ObDatum &expr_datum)
{
int ret = OB_SUCCESS;
UNUSED(expr);
int64_t utc_timestamp = 0;
ObTimeZoneInfoWrap tz_info_wrap;
const ObTimeZoneInfo *cur_tz_info = get_timezone_info(ctx.exec_ctx_.get_my_session());
if (OB_ISNULL(ctx.exec_ctx_.get_physical_plan_ctx())
|| OB_ISNULL(ctx.exec_ctx_.get_my_session())
|| OB_ISNULL(cur_tz_info)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("phy_plan_ctx_ or my_session_ or cur_tz_info is null",
"phy_plan_ctx", ctx.exec_ctx_.get_physical_plan_ctx(), K(cur_tz_info), K(ret));
} else if (OB_UNLIKELY(!ctx.exec_ctx_.get_physical_plan_ctx()->has_cur_time())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("physical plan context don't have current time value");
} else {
utc_timestamp = ctx.exec_ctx_.get_physical_plan_ctx()->get_cur_time().get_datetime();
ObString sys_time_zone;
const ObString OLD_SERVER_SYSTIMEZONE("CST");
if (OB_FAIL(ctx.exec_ctx_.get_my_session()->get_sys_variable(share::SYS_VAR_SYSTEM_TIME_ZONE,
sys_time_zone))) {
LOG_WARN("Get sys variable error", K(ret));
} else if (0 == sys_time_zone.case_compare(OLD_SERVER_SYSTIMEZONE)) {
LOG_DEBUG("sys_time_zone is CST, maybe from old server, use local value instead",
K(sys_time_zone), "local value", ObSpecialSysVarValues::system_time_zone_str_);
sys_time_zone = ObSpecialSysVarValues::system_time_zone_str_;
}
if (OB_SUCC(ret)) {
if (OB_FAIL(tz_info_wrap.init_time_zone(sys_time_zone,
OB_INVALID_VERSION, *(const_cast<ObTZInfoMap *>(cur_tz_info->get_tz_info_map()))))) {
LOG_WARN("tz_info_wrap init_time_zone fail", KR(ret), K(sys_time_zone));
} else {
cur_tz_info = tz_info_wrap.get_time_zone_info();
LOG_DEBUG("succ to get tz_info", K(sys_time_zone), K(cur_tz_info));
}
}
}
if (OB_SUCC(ret)) {
int64_t dt_value = 0;
int64_t odate_value = 0;
ObOTimestampData timestamp_value;
if (OB_FAIL(ObTimeConverter::timestamp_to_datetime(utc_timestamp,
cur_tz_info,
dt_value))) {
LOG_WARN("failed to convert timestamp to datetime", K(ret));
} else if (FALSE_IT(ObTimeConverter::datetime_to_odate(dt_value, odate_value))) {
} else if (OB_FAIL(ObTimeConverter::odate_to_otimestamp(odate_value,
cur_tz_info,
ObTimestampTZType,
timestamp_value))) {
LOG_WARN("failed to convert timestamp to datetime", K(ret));
} else {
expr_datum.set_otimestamp_tz(timestamp_value);
}
}
return ret;
}
int ObExprSysTimestamp::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_ = ObExprSysTimestamp::eval_systimestamp;
return OB_SUCCESS;
}
ObExprLocalTimestamp::ObExprLocalTimestamp(ObIAllocator &alloc)
: ObFuncExprOperator(alloc, T_FUN_SYS_LOCALTIMESTAMP, N_LOCALTIMESTAMP, 0, NOT_ROW_DIMENSION)
{
}
ObExprLocalTimestamp::~ObExprLocalTimestamp()
{
}
int ObExprLocalTimestamp::calc_result_type0(ObExprResType &type, ObExprTypeCtx &type_ctx) const
{
//https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions079.htm
UNUSED(type_ctx);
type.set_timestamp_nano();
return OB_SUCCESS;
}
int ObExprLocalTimestamp::eval_localtimestamp(const ObExpr &expr, ObEvalCtx &ctx,
ObDatum &expr_datum)
{
int ret = OB_SUCCESS;
UNUSED(expr);
if (OB_ISNULL(ctx.exec_ctx_.get_physical_plan_ctx())
|| OB_ISNULL(ctx.exec_ctx_.get_my_session())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("phy_plan_ctx_ or my_session_ or cur_tz_info is null",
"phy_plan_ctx", ctx.exec_ctx_.get_physical_plan_ctx(), K(ret));
} else if (OB_UNLIKELY(!ctx.exec_ctx_.get_physical_plan_ctx()->has_cur_time())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("physical plan context don't have current time value");
} else {
int64_t utc_value = ctx.exec_ctx_.get_physical_plan_ctx()->get_cur_time_tardy_value();
int64_t dt_value = 0;
int64_t odate_value = 0;
ObOTimestampData ts_value;
if (OB_FAIL(ObTimeConverter::timestamp_to_datetime(utc_value,
get_timezone_info(ctx.exec_ctx_.get_my_session()),
dt_value))) {
LOG_WARN("failed to convert timestamp to datetime", K(ret));
} else if (FALSE_IT(ObTimeConverter::trunc_datetime(expr.datum_meta_.scale_, dt_value))) {
} else if (FALSE_IT(ObTimeConverter::datetime_to_odate(dt_value, odate_value))) {
} else if (OB_FAIL(ObTimeConverter::odate_to_otimestamp(odate_value,
get_timezone_info(ctx.exec_ctx_.get_my_session()),
ObTimestampNanoType,
ts_value))) {
LOG_WARN("failed to convert timestamp to datetime", K(ret));
} else {
expr_datum.set_otimestamp_tiny(ts_value);
}
}
return ret;
}
int ObExprLocalTimestamp::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_ = ObExprLocalTimestamp::eval_localtimestamp;
return OB_SUCCESS;
}
int ObExprToTimestamp::set_my_result_from_ob_time(ObExprCtx &expr_ctx, ObTime &ob_time, common::ObObj &result) const
{
int ret = OB_SUCCESS;
UNUSED(expr_ctx);
ObOTimestampData result_value;
if (OB_FAIL(ObTimeConverter::ob_time_to_otimestamp(ob_time, result_value))) {
LOG_WARN("failed to convert ob time to datetime", K(ret));
} else {
result.set_otimestamp_value(get_my_target_obj_type(), result_value);
result.set_scale(MAX_SCALE_FOR_ORACLE_TEMPORAL);
}
return ret;
}
int ObExprToTimestampTZ::set_my_result_from_ob_time(ObExprCtx &expr_ctx, ObTime &ob_time, common::ObObj &result) const
{
int ret = OB_SUCCESS;
ObTimeConvertCtx time_cvrt_ctx(get_timezone_info(expr_ctx.my_session_), false);
ObOTimestampData result_value;
if (OB_FAIL(ObTimeConverter::ob_time_to_utc(ObTimestampTZType, time_cvrt_ctx, ob_time))) {
LOG_WARN("failed to convert ob_time to utc", K(ret));
} else if (OB_FAIL(ObTimeConverter::ob_time_to_otimestamp(ob_time, result_value))) {
LOG_WARN("failed to convert ob time to datetime", K(ret));
} else {
result.set_otimestamp_value(get_my_target_obj_type(), result_value);
result.set_scale(MAX_SCALE_FOR_ORACLE_TEMPORAL);
}
return ret;
}
ObExprTimestamp::ObExprTimestamp(ObIAllocator &alloc)
: ObFuncExprOperator(alloc, T_FUN_SYS_TIMESTAMP, N_TIMESTAMP, ONE_OR_TWO, NOT_ROW_DIMENSION)
{
}
ObExprTimestamp::~ObExprTimestamp()
{
}
int ObExprTimestamp::calc_result_typeN(ObExprResType &type,
ObExprResType *types_array,
int64_t param_num,
ObExprTypeCtx &type_ctx) const
{
int ret = OB_SUCCESS;
if (OB_UNLIKELY(1 != param_num && 2 != param_num)) {
ret = OB_ERR_PARAM_SIZE;
LOG_WARN("invalid argument count of funtion timestmap", K(ret));
} else {
//param will be casted to ObDatetimeType before calculation
type.set_type(ObDateTimeType);
types_array[0].set_calc_type(ObDateTimeType);
if (2 == param_num) {
types_array[1].set_calc_type(ObTimeType);
}
//deduce scale now.
int16_t scale1 = MIN(types_array[0].get_scale(), MAX_SCALE_FOR_TEMPORAL);
scale1 = (SCALE_UNKNOWN_YET == scale1) ? MAX_SCALE_FOR_TEMPORAL : scale1;
int16_t scale2 = 0;
if (2 == param_num) {
scale2 = MIN(types_array[1].get_scale(), MAX_SCALE_FOR_TEMPORAL);
scale2 = (SCALE_UNKNOWN_YET == scale2) ? MAX_SCALE_FOR_TEMPORAL : scale2;
}
type.set_scale(MAX(scale1, scale2));
type_ctx.set_cast_mode(type_ctx.get_cast_mode() | CM_NULL_ON_WARN);
}
return ret;
}
int ObExprTimestamp::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 (1 == rt_expr.arg_cnt_) {
ObObjType type = rt_expr.args_[0]->datum_meta_.type_;
CK(ObNullType == type || ObDateTimeType == type);
if (OB_SUCC(ret)) {
rt_expr.eval_func_ = ObExprTimestamp::calc_timestamp1;
}
} else if (2 == rt_expr.arg_cnt_) {
ObObjType type1 = rt_expr.args_[0]->datum_meta_.type_;
ObObjType type2 = rt_expr.args_[1]->datum_meta_.type_;
CK(ObNullType == type1 || ObDateTimeType == type1);
CK(ObNullType == type2 || ObTimeType == type2);
if (OB_SUCC(ret)) {
rt_expr.eval_func_ = ObExprTimestamp::calc_timestamp2;
}
} else {
ret = OB_ERR_PARAM_SIZE;
LOG_WARN("invalid argument count of funtion timestmap", K(ret));
}
return ret;
}
int ObExprTimestamp::calc_timestamp1(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &result)
{
int ret = OB_SUCCESS;
ObDatum *param = NULL;
if (OB_FAIL(expr.eval_param_value(ctx, param))) {
LOG_WARN("calc param failed", K(ret));
} else if (param->is_null()) {
result.set_null();
} else {
result.set_datetime(param->get_datetime());
}
return ret;
}
int ObExprTimestamp::calc_timestamp2(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &result)
{
int ret = OB_SUCCESS;
ObDatum *datetime = NULL;
ObDatum *time = NULL;
if (OB_FAIL(expr.eval_param_value(ctx, datetime, time))) {
LOG_WARN("calc param failed", K(ret));
} else if (datetime->is_null() || time->is_null()) {
result.set_null();
} else {
result.set_datetime(datetime->get_datetime() + time->get_time());
}
return ret;
}
} //namespace sql
} //namespace oceanbase
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