98 lines
2.9 KiB
C++
98 lines
2.9 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_usec_to_time.h"
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#include "lib/ob_name_def.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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#include "lib/timezone/ob_time_convert.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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ObExprUsecToTime::ObExprUsecToTime(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_USEC_TO_TIME, N_USEC_TO_TIME, 1, NOT_ROW_DIMENSION)
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{
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}
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ObExprUsecToTime::~ObExprUsecToTime()
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{
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}
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int ObExprUsecToTime::calc_result_type1(ObExprResType &type,
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ObExprResType &usec,
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common::ObExprTypeCtx &type_ctx) const
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{
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UNUSED(type_ctx);
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int ret = common::OB_SUCCESS;
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if (OB_UNLIKELY(common::ObIntTC == type.get_type_class() && common::ObNullType != usec.get_type())) {
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ret = common::OB_INVALID_ARGUMENT_FOR_USEC_TO_TIME;
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} else {
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type.set_timestamp();
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type.set_scale(common::MAX_SCALE_FOR_TEMPORAL); //和时间值有关，取最大值
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//set calc type
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usec.set_calc_type(ObIntType);
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}
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return ret;
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}
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int calc_usec_to_time_expr(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res_datum)
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{
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int ret = OB_SUCCESS;
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ObDatum *usec_datum = NULL;
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if (OB_FAIL(expr.args_[0]->eval(ctx, usec_datum))) {
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LOG_WARN("eval arg failed", K(ret));
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} else if (usec_datum->is_null()) {
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res_datum.set_null();
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} else {
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int64_t value = usec_datum->get_int();
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int32_t offset = 0;
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const ObTimeZoneInfo* tz_info = get_timezone_info(ctx.exec_ctx_.get_my_session());
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if (NULL != tz_info && ObTimeConverter::ZERO_DATETIME != value) {
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if (OB_FAIL(tz_info->get_timezone_offset(USEC_TO_SEC(value), offset))) {
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LOG_WARN("failed to get offset between utc and local", K(ret));
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} else {
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value += SEC_TO_USEC(offset);
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}
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}
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if (OB_SUCC(ret)) {
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if (!ObTimeConverter::is_valid_datetime(value)) {
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ret = OB_DATETIME_FUNCTION_OVERFLOW;
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value -= SEC_TO_USEC(offset);
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LOG_WARN("datetime overflow", K(ret), K(value));
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} else {
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value -= SEC_TO_USEC(offset);
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res_datum.set_int(value);
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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 ObExprUsecToTime::cg_expr(ObExprCGCtx &expr_cg_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(expr_cg_ctx);
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UNUSED(raw_expr);
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rt_expr.eval_func_ = calc_usec_to_time_expr;
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return ret;
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}
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}
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}
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