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oceanbase/src/sql/engine/expr/ob_expr_timestamp_add.cpp

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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_add.h"
#include "sql/engine/expr/ob_expr_add.h"
#include "sql/engine/expr/ob_expr_mul.h"
#include "sql/engine/expr/ob_datum_cast.h"
#include "sql/engine/ob_exec_context.h"
#include "lib/ob_date_unit_type.h"
#include "lib/ob_name_def.h"
#include "lib/timezone/ob_time_convert.h"
#include "share/object/ob_obj_cast.h"
#include "sql/session/ob_sql_session_info.h"
#include "common/sql_mode/ob_sql_mode_utils.h"
namespace oceanbase
{
using namespace common;
namespace sql
{
ObExprTimeStampAdd::ObExprTimeStampAdd(ObIAllocator &alloc)
: ObFuncExprOperator(alloc, T_FUN_SYS_TIME_STAMP_ADD, N_TIME_STAMP_ADD, 3, NOT_ROW_DIMENSION)
{
}
ObExprTimeStampAdd::~ObExprTimeStampAdd()
{
}
inline int ObExprTimeStampAdd::calc_result_type3(ObExprResType &type,
ObExprResType &unit,
ObExprResType &interval,
ObExprResType &timestamp,
common::ObExprTypeCtx &type_ctx) const
{
UNUSED(type_ctx);
UNUSED(unit);
UNUSED(interval);
UNUSED(timestamp);
int ret = OB_SUCCESS;
ObCompatibilityMode compat_mode = get_compatibility_mode();
//not timestamp. compatible with mysql.
type.set_varchar();
type.set_length(common::ObAccuracy::MAX_ACCURACY2[compat_mode][common::ObTimestampType].precision_
+ common::ObAccuracy::MAX_ACCURACY2[compat_mode][common::ObTimestampType].scale_ + 1);
type.set_collation_level(common::CS_LEVEL_IMPLICIT);
//not connection collation. compatible with mysql.
type.set_collation_type(common::ObCharset::get_default_collation(common::ObCharset::get_default_charset()));
unit.set_calc_type(ObIntType);
interval.set_calc_type(ObIntType);
return ret;
}
void ObExprTimeStampAdd::check_reset_status(const ObCastMode cast_mode,
int &ret,
ObObj &result)
{
if (OB_FAIL(ret)) {
if (CM_IS_WARN_ON_FAIL(cast_mode)) {
ret = OB_SUCCESS;
result.set_null();
}
}
}
int ObExprTimeStampAdd::calc(const int64_t unit_value,
ObTime &ot,
const int64_t ts,
const ObTimeConvertCtx &cvrt_ctx,
int64_t interval,
int64_t &value)
{
int ret = OB_SUCCESS;
static const int64_t USECS_PER_WEEK = (USECS_PER_DAY * DAYS_PER_WEEK);
static const int64_t USECS_PER_HOUR = (static_cast<int64_t>(USECS_PER_SEC) * SECS_PER_HOUR);
static const int64_t USECS_PER_MIN = (USECS_PER_SEC * SECS_PER_MIN);
static const int64_t MONTH_PER_QUARTER = 3;
int64_t quota = -1;
int64_t delta = 0;
switch(unit_value) {
case DATE_UNIT_MICROSECOND: {
quota = 1;
//fall through
}
case DATE_UNIT_SECOND: {
quota = (-1 == quota ? USECS_PER_SEC : quota);
//fall through
}
case DATE_UNIT_MINUTE: {
quota = (-1 == quota ? USECS_PER_MIN : quota);
//fall through
}
case DATE_UNIT_HOUR: {
quota = (-1 == quota ? USECS_PER_HOUR : quota);
//fall through
}
case DATE_UNIT_DAY: {
quota = (-1 == quota ? USECS_PER_DAY : quota);
//fall through
}
case DATE_UNIT_WEEK: {
quota = (-1 == quota ? USECS_PER_WEEK : quota);
if (ObExprMul::is_mul_out_of_range(interval, quota, delta)) {
ret = OB_DATETIME_FUNCTION_OVERFLOW;
LOG_WARN("timestamp value is out of range", K(ret), K(quota), K(interval), K(ts), K(delta), K(value));
} else {
if (ObExprAdd::is_add_out_of_range(ts, delta, value)) {
ret = OB_DATETIME_FUNCTION_OVERFLOW;
LOG_WARN("timestamp value is out of range", K(ret), K(quota), K(interval), K(ts), K(delta), K(value));
}
}
break;
}
case DATE_UNIT_MONTH: {
//select timestampadd(month, 3, "2010-08-01 11:11:11");
//diff_month = 3
//so, result == 2010-08-01 11:11:11 + 3 month == 2010-11-01 11:11:11
delta = interval;
int32_t month = static_cast<int32_t>((ot.parts_[DT_YEAR]) * (MONS_PER_YEAR) + ot.parts_[DT_MON] - 1);
if (OB_UNLIKELY(ObExprAdd::is_add_out_of_range(month, delta, month))) {
ret = OB_DATETIME_FUNCTION_OVERFLOW;
LOG_WARN("timestamp value is out of range", K(ret), K(ts), K(month), K(interval));
} else {
ot.parts_[DT_YEAR] = month / 12;
ot.parts_[DT_MON] = month % 12 + 1;
int32_t days = ObTimeConverter::get_days_of_month(ot.parts_[DT_YEAR], ot.parts_[DT_MON]);
if (ot.parts_[DT_MDAY] > days) {
ot.parts_[DT_MDAY] = days;
}
ot.parts_[DT_DATE] = ObTimeConverter::ob_time_to_date(ot);
if (OB_FAIL(ObTimeConverter::ob_time_to_datetime(ot, cvrt_ctx, value))) {
LOG_WARN("ob time to datetime failed", K(ret));
}
}
break;
}
case DATE_UNIT_QUARTER: {
//select timestampadd(quarter, -2, "2010-11-01 11:11:11");
//diff_month = -2 * MONTH_PER_QUARTER = -2 *3 = -6
//so, result == 2010-11-01 11:11:11 + (- 6 month) == 2010-05-01 11:11:11
int32_t month = static_cast<int32_t>((ot.parts_[DT_YEAR]) * MONS_PER_YEAR + (ot.parts_[DT_MON] - 1));
if (OB_UNLIKELY(ObExprMul::is_mul_out_of_range(interval, MONTH_PER_QUARTER, delta))) {
ret = OB_DATETIME_FUNCTION_OVERFLOW;
LOG_WARN("timestamp value is out of range", K(ret), K(ts), K(month), K(interval));
} else if (OB_UNLIKELY(ObExprAdd::is_add_out_of_range(month, delta, month))) {
ret = OB_DATETIME_FUNCTION_OVERFLOW;
LOG_WARN("timestamp value is out of range", K(ret), K(ts), K(month), K(interval));
} else {
//IMHO, no need to define 12 as MONTH_PER_YEAR here.
ot.parts_[DT_YEAR] = month / 12;
ot.parts_[DT_MON] = month % 12 + 1;
ot.parts_[DT_DATE] = ObTimeConverter::ob_time_to_date(ot);
if (OB_FAIL(ObTimeConverter::ob_time_to_datetime(ot, cvrt_ctx, value))) {
LOG_WARN("ob time to datetime failed", K(ret));
}
}
break;
}
case DATE_UNIT_YEAR: {
delta = interval;
if (OB_UNLIKELY(ObExprAdd::is_add_out_of_range(ot.parts_[DT_YEAR], delta, ot.parts_[DT_YEAR]))) {
ret = OB_DATETIME_FUNCTION_OVERFLOW;
LOG_WARN("timestamp value is out of range", K(ret), K(ts), K(ot.parts_[DT_YEAR]), K(interval));
} else {
ot.parts_[DT_DATE] = ObTimeConverter::ob_time_to_date(ot);
if (OB_FAIL(ObTimeConverter::ob_time_to_datetime(ot, cvrt_ctx, value))) {
LOG_WARN("ob time to datetime failed", K(ret));
}
}
break;
}
default: {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("Invalid argument", K(ret), K(unit_value));
break;
}
}
return ret;
}
int calc_timestampadd_expr(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res_datum)
{
int ret = OB_SUCCESS;
const ObSQLSessionInfo *session = ctx.exec_ctx_.get_my_session();
ObDatum *unit_datum = NULL;
ObDatum *interval_datum = NULL;
ObDatum *timestamp_datum = NULL;
if (OB_ISNULL(session)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("session is NULL", K(ret));
} else if (OB_FAIL(expr.args_[0]->eval(ctx, unit_datum)) ||
OB_FAIL(expr.args_[1]->eval(ctx, interval_datum)) ||
OB_FAIL(expr.args_[2]->eval(ctx, timestamp_datum))) {
LOG_WARN("eval arg failed", K(ret), KP(unit_datum), KP(interval_datum),
KP(timestamp_datum));
} else if (unit_datum->is_null() || interval_datum->is_null() ||
timestamp_datum->is_null()) {
res_datum.set_null();
} else {
int64_t ts = 0;
int64_t interval_int = interval_datum->get_int();
int64_t res = 0;
ObTime ot;
ObTimeConvertCtx cvrt_ctx(get_timezone_info(ctx.exec_ctx_.get_my_session()), true);
char *buf = NULL;
int64_t buf_len = OB_CAST_TO_VARCHAR_MAX_LENGTH;
int64_t out_len = 0;
if (OB_FAIL(ob_datum_to_ob_time_with_date(*timestamp_datum,
expr.args_[2]->datum_meta_.type_,cvrt_ctx.tz_info_, ot,
get_cur_time(ctx.exec_ctx_.get_physical_plan_ctx()), false, 0,
expr.args_[2]->obj_meta_.has_lob_header()))) {
LOG_WARN("cast to ob time failed", K(ret), K(*timestamp_datum));
} else if (OB_FAIL(ObTimeConverter::ob_time_to_datetime(ot, cvrt_ctx, ts))) {
LOG_WARN("ob time to datetime failed", K(ret));
} else if (OB_FAIL(ObExprTimeStampAdd::calc(unit_datum->get_int(), ot, ts, cvrt_ctx,
interval_int, res))) {
LOG_WARN("calc failed", K(ret), K(*unit_datum), K(ts), K(interval_int));
} else if (OB_ISNULL(buf = expr.get_str_res_mem(ctx, buf_len))) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_WARN("allocate memory failed", K(ret), K(buf_len));
} else if (OB_FAIL(common_datetime_string(ObTimestampType, ObVarcharType,
expr.args_[2]->datum_meta_.scale_, false,
res, ctx, buf, buf_len, out_len))) {
LOG_WARN("common_datetime_string failed", K(ret), K(res), K(expr));
} else {
res_datum.set_string(ObString(out_len, buf));
}
}
if (OB_FAIL(ret) && OB_NOT_NULL(session)) {
uint64_t cast_mode = 0;
if (OB_FAIL(ObSQLUtils::get_default_cast_mode(session->get_stmt_type(),
session, cast_mode))) {
LOG_WARN("get_default_cast_mode failed", K(ret), K(session->get_stmt_type()));
} else if (CM_IS_WARN_ON_FAIL(cast_mode)) {
ret = OB_SUCCESS;
res_datum.set_null();
}
}
return ret;
}
int ObExprTimeStampAdd::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);
rt_expr.eval_func_ = calc_timestampadd_expr;
return ret;
}
} //namespace sql
} //namespace oceanbase
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