231 lines
7.2 KiB
C++
231 lines
7.2 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_diff.h"
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#include "lib/ob_date_unit_type.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 "share/object/ob_obj_cast.h"
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#include "sql/session/ob_sql_session_info.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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ObExprTimeStampDiff::ObExprTimeStampDiff(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_TIME_STAMP_DIFF, N_TIME_STAMP_DIFF, 3, NOT_ROW_DIMENSION)
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{
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}
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ObExprTimeStampDiff::~ObExprTimeStampDiff()
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{
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}
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int ObExprTimeStampDiff::calc(int64_t &res, bool &is_null, int64_t unit_value,
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int64_t usec_left, int64_t usec_right,
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const ObTimeZoneInfo *tz_info)
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{
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int ret = OB_SUCCESS;
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is_null = false;
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if (ObTimeConverter::ZERO_DATETIME == usec_left
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|| ObTimeConverter::ZERO_DATETIME == usec_right) {
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is_null = true;
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} else {
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int64_t delta = usec_right - usec_left;
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int64_t diff = 0;
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static const int64_t USECS_PER_WEEK = (USECS_PER_DAY * DAYS_PER_WEEK);
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static const int64_t USECS_PER_HOUR = (static_cast<int64_t>(USECS_PER_SEC) * SECS_PER_HOUR);
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static const int64_t USECS_PER_MIN = (USECS_PER_SEC * SECS_PER_MIN);
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switch(unit_value) {
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case DATE_UNIT_MICROSECOND: {
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res = delta;
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break;
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}
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case DATE_UNIT_SECOND: {
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res = delta / USECS_PER_SEC;
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break;
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}
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case DATE_UNIT_MINUTE: {
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res = delta / USECS_PER_MIN;
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break;
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}
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case DATE_UNIT_HOUR: {
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res = delta / USECS_PER_HOUR;
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break;
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}
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case DATE_UNIT_DAY: {
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res = delta / USECS_PER_DAY;
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break;
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}
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case DATE_UNIT_WEEK: {
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res = delta / USECS_PER_WEEK;
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break;
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}
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case DATE_UNIT_MONTH: {
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ret = calc_month_diff(usec_left, usec_right, tz_info, diff);
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res = diff;
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break;
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}
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case DATE_UNIT_QUARTER: {
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ret = calc_month_diff(usec_left, usec_right, tz_info, diff);
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res = diff / MONS_PER_QUAR;
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break;
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}
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case DATE_UNIT_YEAR: {
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ret = calc_month_diff(usec_left, usec_right, tz_info, diff);
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res = diff / MONS_PER_YEAR;
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break;
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}
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default: {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("Invalid argument", K(ret), K(usec_left), K(usec_right), K(unit_value));
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break;
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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 ObExprTimeStampDiff::adjust_sub_one(const ObTime *p_min, const ObTime *p_max, int64_t &bias)
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{
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int ret = OB_SUCCESS;
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bias = 0;
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if (OB_ISNULL(p_min) || OB_ISNULL(p_max)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_ERROR("Pointer(s) is null!", K(ret), K(p_min), K(p_max));
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} else if (p_max->parts_[DT_MDAY] < p_min->parts_[DT_MDAY]) {
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//2010-02-10 VS 2010-02-09
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bias = -1;
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} else if (p_max->parts_[DT_MDAY] > p_min->parts_[DT_MDAY]) {
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//2010-02-10 VS 2010-02-19
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//do nothing
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} else if (p_max->parts_[DT_HOUR] < p_min->parts_[DT_HOUR]) {
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//2010-02-19 12:00 VS 2010-02-19 11:00
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bias = -1;
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} else if (p_max->parts_[DT_HOUR] > p_min->parts_[DT_HOUR]) {
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//2010-02-19 12:00 VS 2010-02-19 13:00
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//do nothing
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} else if (p_max->parts_[DT_MIN] < p_min->parts_[DT_MIN]) {
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//2010-02-19 12:10 VS 2010-02-19 12:08
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bias = -1;
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} else if (p_max->parts_[DT_MIN] > p_min->parts_[DT_MIN]) {
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//2010-02-19 12:10 VS 2010-02-19 12:15
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//do nothing
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} else if (p_max->parts_[DT_SEC] < p_min->parts_[DT_SEC]) {
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//2010-02-19 12:15:18 VS 2010-02-19 12:15:16
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bias = -1;
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} else if (p_max->parts_[DT_SEC] > p_min->parts_[DT_SEC]) {
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//2010-02-19 12:15:18 VS 2010-02-19 12:15:19
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//do nothing
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} else if (p_max->parts_[DT_USEC] < p_min->parts_[DT_USEC]) {
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bias = -1;
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}
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return ret;
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}
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int ObExprTimeStampDiff::calc_month_diff(const int64_t &left,
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const int64_t &right,
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const ObTimeZoneInfo *tz_info,
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int64_t &diff)
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{
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int ret = OB_SUCCESS;
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diff = 0;
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ObTime ot_left;
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ObTime ot_right;
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if(OB_FAIL(ObTimeConverter::datetime_to_ob_time(left, tz_info, ot_left))) {
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LOG_WARN("failed to cast to ob_time", K(ret), K(left));
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} else if(OB_FAIL(ObTimeConverter::datetime_to_ob_time(right, tz_info, ot_right))) {
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LOG_WARN("failed to cast to ob_time", K(ret), K(right));
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} else {
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int64_t month_right = (ot_right.parts_[DT_YEAR]) * MONS_PER_YEAR + ot_right.parts_[DT_MON];
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int64_t month_left = (ot_left.parts_[DT_YEAR]) * MONS_PER_YEAR + ot_left.parts_[DT_MON];
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ObTime *p_min = NULL;
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ObTime *p_max = NULL;
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int sign = 1;
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if (month_right >= month_left) {
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//like 2010-01-01 VS 2011-01-01
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p_min = &ot_left;
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p_max = &ot_right;
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diff = month_right - month_left;
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} else {
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//like 2012-01-01 VS 2011-01-01
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p_min = &ot_right;
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p_max = &ot_left;
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diff = month_left - month_right;
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sign = -1;
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}
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//interval of 2011-03-01 and 2011-01-04 should be 2 not 3
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//so we have to adjust the diff to be right value
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int64_t bias = 0;
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if (0 != diff && OB_SUCC(adjust_sub_one(p_min, p_max, bias))) {
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diff += bias;
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diff *=sign;
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}
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}
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return ret;
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}
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int ObExprTimeStampDiff::eval_timestamp_diff(const ObExpr &expr, ObEvalCtx &ctx,
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ObDatum &res)
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{
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int ret = OB_SUCCESS;
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ObDatum *u = NULL;
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ObDatum *l = NULL;
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ObDatum *r = NULL;
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const ObSQLSessionInfo *session = ctx.exec_ctx_.get_my_session();
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if (OB_ISNULL(session)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("session is NULL", K(ret));
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} else if (OB_FAIL(expr.eval_param_value(ctx, u, l, r))) {
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LOG_WARN("eval arg failed", K(ret));
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} else if (u->is_null()) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("unit cannot be null", K(ret));
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} else if (l->is_null() || r->is_null()) {
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res.set_null();
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} else {
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int64_t res_int = 0;
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bool is_null = false;
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if (OB_FAIL(calc(res_int, is_null, u->get_int(), l->get_timestamp(),
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r->get_timestamp(), session->get_timezone_info()))) {
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LOG_WARN("calc failed", K(ret));
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} else if (is_null) {
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res.set_null();
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} else {
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res.set_int(res_int);
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}
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}
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return ret;
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}
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int ObExprTimeStampDiff::cg_expr(ObExprCGCtx &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(ctx);
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UNUSED(raw_expr);
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CK(3 == rt_expr.arg_cnt_);
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CK(ObIntType == rt_expr.args_[0]->datum_meta_.type_ &&
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ObTimestampType == rt_expr.args_[1]->datum_meta_.type_ &&
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ObTimestampType == rt_expr.args_[2]->datum_meta_.type_);
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OX(rt_expr.eval_func_ = eval_timestamp_diff);
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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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