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2021-05-31 22:56:52 +08:00
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src/sql/engine/expr/ob_expr_time_diff.cpp Normal file
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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_time_diff.h"
#include "lib/ob_date_unit_type.h"
#include "lib/ob_name_def.h"
#include "share/object/ob_obj_cast.h"
#include "sql/session/ob_sql_session_info.h"
#include "sql/engine/ob_exec_context.h"
#include "sql/engine/expr/ob_datum_cast.h"
namespace oceanbase {
using namespace common;
namespace sql {
ObExprTimeDiff::ObExprTimeDiff(ObIAllocator& alloc)
: ObFuncExprOperator(alloc, T_FUN_SYS_TIME_DIFF, N_TIME_DIFF, 2, NOT_ROW_DIMENSION)
{}
ObExprTimeDiff::~ObExprTimeDiff()
{}
int ObExprTimeDiff::calc_result2(ObObj& result, const ObObj& left, const ObObj& right, ObExprCtx& expr_ctx) const
{
EXPR_DEFINE_CAST_CTX(expr_ctx, CM_NONE);
return calc(result, left, right, cast_ctx);
}
int ObExprTimeDiff::get_diff_value_with_ob_time(ObTime& ot1, ObTime& ot2, const ObTimeZoneInfo* tz_info, int64_t& diff)
{
int ret = OB_SUCCESS;
int64_t value1 = 0;
int64_t value2 = 0;
ObTimeConvertCtx cvrt_ctx(tz_info, true);
if (OB_UNLIKELY(0 == ot1.parts_[DT_DATE] && 0 != ot2.parts_[DT_DATE]) ||
(0 != ot1.parts_[DT_DATE] && 0 == ot2.parts_[DT_DATE])) {
// invalid in mysql. result will be null
ret = OB_INVALID_DATE_VALUE;
} else {
if (OB_UNLIKELY(0 == ot1.parts_[DT_DATE])) {
value1 = ObTimeConverter::ob_time_to_time(ot1);
value2 = ObTimeConverter::ob_time_to_time(ot2);
diff = value1 - value2;
} else if (OB_FAIL(ObTimeConverter::ob_time_to_datetime(ot1, cvrt_ctx, value1))) {
ret = OB_INVALID_DATE_VALUE; // in order to be compatible with mysql
} else if (OB_FAIL(ObTimeConverter::ob_time_to_datetime(ot2, cvrt_ctx, value2))) {
ret = OB_INVALID_DATE_VALUE; // in order to be compatible with mysql
} else {
diff = value1 - value2;
}
}
return ret;
}
int ObExprTimeDiff::get_diff_value(const ObObj& obj1, const ObObj& obj2, const ObTimeZoneInfo* tz_info, int64_t& diff)
{
int ret = OB_INVALID_DATE_VALUE;
ObTime ot1;
ObTime ot2;
if (OB_LIKELY(OB_SUCCESS == ob_obj_to_ob_time_without_date(obj1, tz_info, ot1) &&
OB_SUCCESS == ob_obj_to_ob_time_without_date(obj2, tz_info, ot2))) {
ret = get_diff_value_with_ob_time(ot1, ot2, tz_info, diff);
} /*else ret will be OB_INVALID_DATE_VALUE itself.
NOT overwritten by last call for ob_obj_to_ob_time_without_date.
by design*/
return ret;
}
int ObExprTimeDiff::calc(ObObj& result, const ObObj& left, const ObObj& right, ObCastCtx& cast_ctx)
{
int ret = OB_SUCCESS;
int64_t int64_diff = 0;
if (OB_UNLIKELY(left.is_null() || right.is_null())) {
result.set_null();
} else if (OB_FAIL(get_diff_value(left, right, cast_ctx.dtc_params_.tz_info_, int64_diff))) {
result.set_null();
} else {
int flag = int64_diff > 0 ? 1 : -1;
int64_diff *= flag; // abs operation for time_overflow_trunc
ret = ObTimeConverter::time_overflow_trunc(int64_diff);
int64_diff = int64_diff * flag; // restore value
result.set_time(int64_diff);
}
if (OB_SUCCESS != ret && CM_IS_WARN_ON_FAIL(cast_ctx.cast_mode_)) {
ret = OB_SUCCESS;
}
return ret;
}
int ObExprTimeDiff::cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
{
UNUSED(op_cg_ctx);
UNUSED(raw_expr);
int ret = OB_SUCCESS;
if (rt_expr.arg_cnt_ != 2) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("timediff expr should have two params", K(ret), K(rt_expr.arg_cnt_));
} else if (OB_ISNULL(rt_expr.args_) || OB_ISNULL(rt_expr.args_[0]) || OB_ISNULL(rt_expr.args_[1])) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("children of timediff expr is null", K(ret), K(rt_expr.args_));
} else {
rt_expr.eval_func_ = ObExprTimeDiff::calc_timediff;
}
return ret;
}
int ObExprTimeDiff::calc_timediff(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
{
int ret = OB_SUCCESS;
bool calc_param_failure = false;
ObDatum* param_datum1 = NULL;
ObDatum* param_datum2 = NULL;
const ObSQLSessionInfo* session = NULL;
if (OB_ISNULL(session = ctx.exec_ctx_.get_my_session())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("session is null", K(ret));
} else if (OB_FAIL(expr.args_[0]->eval(ctx, param_datum1))) {
calc_param_failure = true;
LOG_WARN("eval param value failed", K(ret));
} else if (OB_UNLIKELY(param_datum1->is_null())) {
expr_datum.set_null();
} else {
int64_t int64_diff = 0;
ObTime ot1;
ObTime ot2;
if (OB_FAIL(ob_datum_to_ob_time_without_date(
*param_datum1, expr.args_[0]->datum_meta_.type_, get_timezone_info(session), ot1))) {
LOG_WARN("cast the first param failed", K(ret));
ret = OB_INVALID_DATE_VALUE;
expr_datum.set_null();
} else if (OB_FAIL(expr.args_[1]->eval(ctx, param_datum2))) {
calc_param_failure = true;
LOG_WARN("eval param value failed", K(ret));
} else if (param_datum2->is_null()) {
expr_datum.set_null();
} else if (OB_FAIL(ob_datum_to_ob_time_without_date(
*param_datum2, expr.args_[1]->datum_meta_.type_, get_timezone_info(session), ot2))) {
LOG_WARN("cast the second param failed", K(ret));
ret = OB_INVALID_DATE_VALUE;
expr_datum.set_null();
} else if (OB_FAIL(get_diff_value_with_ob_time(ot1, ot2, get_timezone_info(session), int64_diff))) {
LOG_WARN("get diff value with ob time failed", K(ret));
expr_datum.set_null();
} else {
int flag = int64_diff > 0 ? 1 : -1;
int64_diff *= flag; // abs operation for time_overflow_trunc
ret = ObTimeConverter::time_overflow_trunc(int64_diff);
int64_diff = int64_diff * flag; // restore value
expr_datum.set_time(int64_diff);
}
if (OB_SUCCESS != ret) {
uint64_t cast_mode = 0;
ObSQLUtils::get_default_cast_mode(session->get_stmt_type(), session, cast_mode);
if (!calc_param_failure && CM_IS_WARN_ON_FAIL(cast_mode)) {
ret = OB_SUCCESS;
}
}
}
return ret;
}
} // namespace sql
} // namespace oceanbase