179 lines
6.6 KiB
C++
179 lines
6.6 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_tz_offset.h"
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#include "sql/engine/expr/ob_expr_util.h"
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#include "lib/time/ob_time_utility.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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const int64_t ORACLE_TZ_OFFSET_MAX_LENGTH = 7;//[+|-]TZH:TZM
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ObExprTzOffset::ObExprTzOffset(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_TZ_OFFSET, N_TZ_OFFSET, 1, VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
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{
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}
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int ObExprTzOffset::calc_result_type1(ObExprResType &type,
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ObExprResType &input,
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common::ObExprTypeCtx &type_ctx) const
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{
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int ret = OB_SUCCESS;
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if (OB_UNLIKELY(!input.is_varchar_or_char()
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&& !input.is_null())) {
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ret = common::OB_ERR_INVALID_TYPE_FOR_ARGUMENT;
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LOG_WARN("invalid type", K(input.get_type()));
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} else {
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CK(OB_NOT_NULL(type_ctx.get_session()));
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if (OB_SUCC(ret)) {
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type.set_varchar();
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type.set_collation_type(type_ctx.get_session()->get_nls_collation());
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type.set_collation_level(CS_LEVEL_IMPLICIT);
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type.set_length(ORACLE_TZ_OFFSET_MAX_LENGTH);
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type.set_length_semantics(type_ctx.get_session()->get_actual_nls_length_semantics());
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input.set_calc_type(ObVarcharType);
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input.set_calc_collation_type(ObCharset::get_system_collation());
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input.set_calc_collation_level(CS_LEVEL_IMPLICIT);
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}
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}
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return ret;
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}
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int ObExprTzOffset::eval_tz_offset_val(const ObString &in_tz_str,
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ObSQLSessionInfo &my_session,
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ObIAllocator &alloc,
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ObString &res_str)
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{
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int ret = OB_SUCCESS;
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ObString trimed_tz_str = in_tz_str;
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trimed_tz_str = trimed_tz_str.trim();
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int32_t offset_sec = 0;
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int32_t offset_min = 0;
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int ret_more = OB_SUCCESS;
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if (OB_FAIL(ObTimeConverter::str_to_offset(trimed_tz_str, offset_sec, ret_more,
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is_oracle_mode(), true))) {
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if (ret != OB_ERR_UNKNOWN_TIME_ZONE) {
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LOG_WARN("fail to convert str_to_offset", K(trimed_tz_str), K(ret));
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} else if (ret_more != OB_SUCCESS) {
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ret = ret_more;
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LOG_WARN("invalid time zone hour or minute", K(trimed_tz_str), K(ret));
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}
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} else {
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offset_min = offset_sec / SECS_PER_MIN;
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}
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if (OB_ERR_UNKNOWN_TIME_ZONE == ret) {
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ObTime ob_time(DT_TYPE_ORACLE_TTZ);
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MEMCPY(ob_time.tz_name_, trimed_tz_str.ptr(), trimed_tz_str.length());
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ob_time.tz_name_[trimed_tz_str.length()] = '\0';
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ob_time.is_tz_name_valid_ = true;
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ObTimeConvertCtx cvrt_ctx(TZ_INFO(&my_session), true);
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ObOTimestampData tmp_ot_data;
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tmp_ot_data.time_ctx_.tz_desc_ = 0;
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tmp_ot_data.time_ctx_.store_tz_id_ = 0;
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tmp_ot_data.time_us_ = ObTimeUtility::current_time();
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if (OB_FAIL(ObTimeConverter::otimestamp_to_ob_time(ObTimestampLTZType, tmp_ot_data,
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NULL, ob_time))) {
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LOG_WARN("failed to convert otimestamp_to_ob_time", K(ret));
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} else if (OB_FAIL(ObTimeConverter::str_to_tz_offset(cvrt_ctx, ob_time))) {
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LOG_WARN("failed to convert string to tz_offset", K(ret));
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} else {
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offset_min = ob_time.parts_[DT_OFFSET_MIN];
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LOG_DEBUG("finish str_to_tz_offset", K(ob_time), K(tmp_ot_data));
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}
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}
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if (OB_SUCC(ret)) {
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char *res_ptr = NULL;
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int64_t pos = 0;
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const char *fmt_str = (offset_min < 0 ? "-%02d:%02d" : "+%02d:%02d");
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// 即使alloc分配的空间比实际需要的多应该也没关系
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// ORACLE_TZ_OFFSET_MAX_LENGTH为7, 很小的值
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if (OB_ISNULL(res_ptr = static_cast<char*>(alloc.alloc(ORACLE_TZ_OFFSET_MAX_LENGTH)))) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("Failed to alloc", "size", ORACLE_TZ_OFFSET_MAX_LENGTH , K(ret));
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} else if (OB_FAIL(databuff_printf(res_ptr, ORACLE_TZ_OFFSET_MAX_LENGTH, pos, fmt_str,
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abs(offset_min) / 60, abs(offset_min) % 60))) {
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LOG_WARN("Failed to databuff_printf", K(offset_min), K(ret));
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} else {
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res_str.assign_ptr(res_ptr, pos);
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}
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}
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return ret;
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}
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int ObExprTzOffset::eval_tz_offset(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
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{
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int ret = OB_SUCCESS;
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ObDatum *tz = NULL;
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if (OB_FAIL(expr.eval_param_value(ctx, tz))) {
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LOG_WARN("eval param_value failed", K(ret));
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} else if (tz->is_null()) {
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res.set_null();
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} else {
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const ObString &tz_str = tz->get_string();
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ObString res_str_utf8;
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ObString res_str;
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ObEvalCtx::TempAllocGuard alloc_guard(ctx);
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ObIAllocator &calc_alloc = alloc_guard.get_allocator();
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ObExprStrResAlloc res_alloc(expr, ctx);
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const ObCollationType out_cs_type = expr.datum_meta_.cs_type_;
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CK(OB_NOT_NULL(ctx.exec_ctx_.get_my_session()));
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if (OB_FAIL(ret)) {
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} else if (OB_FAIL(eval_tz_offset_val(tz_str, *ctx.exec_ctx_.get_my_session(),
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calc_alloc, res_str_utf8))) {
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LOG_WARN("eval_tz_offset_val failed", K(ret), K(tz_str));
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} else if (OB_FAIL(ObExprUtil::convert_string_collation(
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res_str_utf8, ObCharset::get_system_collation(),
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res_str, out_cs_type, calc_alloc))) {
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LOG_WARN("convert string coll failed", K(ret), K(res_str_utf8), K(out_cs_type));
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} else if (OB_FAIL(ObExprUtil::deep_copy_str(res_str, res_str, res_alloc))) {
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LOG_WARN("copy str failed", K(ret));
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} else {
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res.set_string(res_str);
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}
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}
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return ret;
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}
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int ObExprTzOffset::cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
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ObExpr &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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CK(1 == expr.arg_cnt_);
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CK(OB_NOT_NULL(expr.args_) && OB_NOT_NULL(expr.args_[0]));
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CK(ob_is_varchar_or_char(expr.args_[0]->datum_meta_.type_,
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expr.args_[0]->datum_meta_.cs_type_));
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CK(ob_is_varchar_or_char(expr.datum_meta_.type_,
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expr.datum_meta_.cs_type_));
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OX(expr.eval_func_ = eval_tz_offset);
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return ret;
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}
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}
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}
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