212 lines
6.7 KiB
C++
212 lines
6.7 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_unix_timestamp.h"
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#include "sql/engine/expr/ob_expr_util.h"
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#include "lib/timezone/ob_time_convert.h"
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#include "lib/allocator/ob_allocator.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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using namespace oceanbase::common;
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using namespace oceanbase::sql;
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namespace oceanbase
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{
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namespace sql
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{
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ObExprUnixTimestamp::ObExprUnixTimestamp(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_UNIX_TIMESTAMP, N_UNIX_TIMESTAMP, ZERO_OR_ONE, NOT_VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
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{
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}
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ObExprUnixTimestamp::~ObExprUnixTimestamp()
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{
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}
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int ObExprUnixTimestamp::calc_result_typeN(ObExprResType &type,
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ObExprResType *type_array,
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int64_t param,
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ObExprTypeCtx &type_ctx) const
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{
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/* yeti:
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* no argument - > int
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* has argument & is literal :
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* --> out_of_range date --> 0.000000
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* --> (has usec) --> int
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* --> (not has usec) --> number scale = -1
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* has argument & is not literal :
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* --> is string --> number scale = 6
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* --> type.scale = 0 --> int
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* --> type.scale != 0 --> number scale = type.scale
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*/
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UNUSED(type_ctx);
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int ret = OB_SUCCESS;
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if (0 == param) {
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type.set_int();
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type.set_scale(ObAccuracy::DDL_DEFAULT_ACCURACY[ObIntType].scale_);
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type.set_precision(ObAccuracy::DDL_DEFAULT_ACCURACY[ObIntType].precision_);
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UNUSED(type_array);
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} else {
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ObExprResType &date_type = type_array[0];
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if(ObNullType == date_type.get_type()) {
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type.set_int();
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} else if (date_type.is_literal()) { // literal
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ret = calc_result_type_literal(type, date_type);
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} else { // column
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ret = calc_result_type_column(type, date_type);
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}
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date_type.set_calc_type(ObTimestampType);
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}
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ret = OB_SUCCESS;//just let it go if error happened
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return ret;
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}
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int ObExprUnixTimestamp::calc_result_type_literal(ObExprResType &type,
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ObExprResType &type1) const
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{
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int ret = OB_SUCCESS;
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ObObj date_obj = type1.get_param();
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bool is_number_res_type = false;
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int64_t utz_value = 0;
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if (date_obj.is_string_type()) { //string
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int16_t scale = DEFAULT_SCALE_FOR_INTEGER;
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ObTimeConvertCtx cvrt_ctx(NULL, false);
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if (OB_FAIL(ObTimeConverter::str_to_datetime(
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date_obj.get_string(), cvrt_ctx, utz_value, &scale, 0))) {
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LOG_WARN("failed to cast str to datetime", K(ret));
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is_number_res_type = true;
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type.set_scale(MAX_SCALE_FOR_TEMPORAL);
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} else {
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type.set_scale(scale);
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}
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} else {
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ObArenaAllocator oballocator(ObModIds::BLOCK_ALLOC); // is this ok?
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ObCastCtx cast_ctx(&oballocator,
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NULL,
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0,
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CM_NONE,
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CS_TYPE_INVALID,
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NULL);
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EXPR_GET_DATETIME_V2(date_obj, utz_value);
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if (OB_FAIL(ret)) {
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LOG_WARN("failed to cast date to datetime", K(ret), K(date_obj));
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utz_value = 0;
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}
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}
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// todo (yeti) out-of-range date --> 0.000000
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if (is_number_res_type || utz_value % 1000000) {
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type.set_number();
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if (!type1.is_string_type()) {
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type.set_scale(type1.get_scale());
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}
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type.set_precision(static_cast<ObPrecision>(TIMESTAMP_VALUE_LENGTH + type.get_scale()));
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} else {
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type.set_int();
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type.set_precision(static_cast<ObPrecision>(TIMESTAMP_VALUE_LENGTH));
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type.set_scale(DEFAULT_SCALE_FOR_INTEGER);
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}
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return ret;
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}
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int ObExprUnixTimestamp::calc_result_type_column(ObExprResType &type,
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ObExprResType &type1) const
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{
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int ret = OB_SUCCESS;
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if (type1.is_string_type() || type1.is_double()) {
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type.set_number();
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type.set_scale(MAX_SCALE_FOR_TEMPORAL);
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type.set_precision(static_cast<ObPrecision>(TIMESTAMP_VALUE_LENGTH + type.get_scale()));
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} else {
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if (DEFAULT_SCALE_FOR_INTEGER == type1.get_scale()) {
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type.set_int();
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type.set_precision(static_cast<ObPrecision>(TIMESTAMP_VALUE_LENGTH));
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type.set_scale(DEFAULT_SCALE_FOR_INTEGER);
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} else {
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type.set_number();
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type.set_scale(type1.get_scale());
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type.set_precision(static_cast<ObPrecision>(TIMESTAMP_VALUE_LENGTH + type.get_scale()));
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}
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}
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return ret;
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}
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int ObExprUnixTimestamp::eval_unix_timestamp(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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int64_t utz_value = 0;
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bool is_null = false;
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if (0 == expr.arg_cnt_) {
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CK(OB_NOT_NULL(ctx.exec_ctx_.get_physical_plan_ctx()));
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if (OB_SUCC(ret)) {
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const ObObj &date = ctx.exec_ctx_.get_physical_plan_ctx()->get_cur_time();
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utz_value = date.get_timestamp();
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}
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} else if (1 == expr.arg_cnt_) {
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ObDatum *arg = NULL;
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if (OB_FAIL(expr.eval_param_value(ctx, arg))) {
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LOG_WARN("eval arg failed", K(ret));
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} else if (arg->is_null()) {
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is_null = true;
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res.set_null();
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} else {
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utz_value = arg->get_timestamp();
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}
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} else {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("unexpected arg cnt", K(ret), K(expr.arg_cnt_));
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}
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if (OB_SUCC(ret) && !is_null) {
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ObObjType res_type = expr.datum_meta_.type_;
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utz_value = utz_value < 0 ? 0 : utz_value;
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if (ObIntType == res_type) {
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res.set_int(utz_value/ 1000000);
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} else if (ObNumberType == res_type) {
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ObEvalCtx::TempAllocGuard alloc_guard(ctx);
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ObIAllocator &calc_alloc = alloc_guard.get_allocator();
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number::ObNumber tmp_nmb;
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number::ObNumber res_nmb;
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number::ObNumber usec_nmb;
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int64_t usec = 1000000;
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OZ(usec_nmb.from(usec, calc_alloc));
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OZ(tmp_nmb.from(utz_value, calc_alloc));
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OZ(tmp_nmb.div(usec_nmb, res_nmb, calc_alloc));
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OX(res.set_number(res_nmb));
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} else {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("unexpected res type", K(ret), K(res_type));
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}
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}
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return ret;
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}
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int ObExprUnixTimestamp::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_ = eval_unix_timestamp;
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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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