135 lines
5.1 KiB
C++
135 lines
5.1 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_scn_to_timestamp.h"
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#include "lib/ob_name_def.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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ObExprScnToTimestamp::ObExprScnToTimestamp(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_SCN_TO_TIMESTAMP, N_SCN_TO_TIMESTAMP, 1, NOT_ROW_DIMENSION)
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{
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}
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ObExprScnToTimestamp::~ObExprScnToTimestamp()
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{
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}
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int ObExprScnToTimestamp::calc_result_type1(ObExprResType &type,
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ObExprResType &scn,
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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 (lib::is_oracle_mode()) {
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type.set_timestamp_nano();
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type.set_precision(ObAccuracy::MAX_ACCURACY[ObTimestampNanoType].precision_);
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type.set_scale(ObAccuracy::MAX_ACCURACY[ObTimestampNanoType].scale_);
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//set calc type
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scn.set_calc_type(ObNumberType);
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scn.set_scale(DEFAULT_SCALE_FOR_INTEGER);
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} else {
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type.set_datetime();
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type.set_precision(ObAccuracy::MAX_ACCURACY[ObDateTimeType].precision_);
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type.set_scale(ObAccuracy::MAX_ACCURACY[ObDateTimeType].scale_);
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//set calc type
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scn.set_calc_type(ObUInt64Type);
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type_ctx.set_cast_mode(type_ctx.get_cast_mode() & (~(CM_WARN_ON_FAIL)));
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}
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return ret;
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}
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int calc_scn_to_timestamp_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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ObTimeZoneInfoWrap tz_info_wrap;
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ObString sys_time_zone;
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const ObTimeZoneInfo *cur_tz_info = get_timezone_info(ctx.exec_ctx_.get_my_session());
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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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ret = lib::is_oracle_mode() ? common::OB_ERR_FETCH_COLUMN_NULL : common::OB_INVALID_ARGUMENT_FOR_SCN_TO_TIMESTAMP;
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LOG_WARN("null is not expected", K(ret));
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} else if (OB_ISNULL(ctx.exec_ctx_.get_my_session()) || OB_ISNULL(cur_tz_info)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN(" my_session_ or cur_tz_info is null", K(cur_tz_info), K(ret));
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} else if (OB_FAIL(ctx.exec_ctx_.get_my_session()->get_sys_variable(share::SYS_VAR_SYSTEM_TIME_ZONE,
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sys_time_zone))) {
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LOG_WARN("Get sys variable error", K(ret));
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} else if (OB_FAIL(tz_info_wrap.init_time_zone(sys_time_zone,
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OB_INVALID_VERSION,
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*(const_cast<ObTZInfoMap *>(cur_tz_info->get_tz_info_map()))))) {
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LOG_WARN("tz_info_wrap init_time_zone fail", KR(ret), K(sys_time_zone));
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} else {
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uint64_t in_value = 0;
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if (lib::is_oracle_mode()) {
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cur_tz_info = tz_info_wrap.get_time_zone_info();
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const number::ObNumber scn_nmb(usec_datum->get_number());
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if (OB_FAIL(scn_nmb.extract_valid_uint64_with_trunc(in_value))) {
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LOG_WARN("extract_valid_uint64_with_trunc failed", K(ret), K(scn_nmb));
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}
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} else {
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in_value = usec_datum->get_uint64();
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}
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if (OB_SUCC(ret)) {
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const int64_t utc_timestamp = in_value / 1000;
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int64_t dt_value = 0;
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if (OB_FAIL(ObTimeConverter::timestamp_to_datetime(utc_timestamp,
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cur_tz_info,
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dt_value))) {
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LOG_WARN("failed to convert timestamp to datetime", K(ret));
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} else if (OB_UNLIKELY(dt_value > DATETIME_MAX_VAL || dt_value < DATETIME_MIN_VAL)) {
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char expr_str[OB_MAX_TWO_OPERATOR_EXPR_LENGTH];
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int64_t pos = 0;
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ret = OB_OPERATE_OVERFLOW;
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pos = 0;
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databuff_printf(expr_str,
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OB_MAX_TWO_OPERATOR_EXPR_LENGTH,
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pos,
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"'scn_to_timestamp(%lu)'", in_value);
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LOG_USER_ERROR(OB_OPERATE_OVERFLOW, "DATE", expr_str);
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} else if (lib::is_oracle_mode()) {
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const int32_t value_ns = in_value % 1000;
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ObOTimestampData out_value;
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out_value.time_us_ = dt_value;
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out_value.time_ctx_.tail_nsec_ = value_ns;
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res_datum.set_otimestamp_tiny(out_value);
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} else {
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res_datum.set_datetime(dt_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 ObExprScnToTimestamp::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_scn_to_timestamp_expr;
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return ret;
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}
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}//end of namespace sql
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}//end of namespace oceanbase
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