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src/sql/engine/expr/ob_expr_unix_timestamp.cpp
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252
src/sql/engine/expr/ob_expr_unix_timestamp.cpp
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/**
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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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namespace sql {
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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_ROW_DIMENSION)
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{}
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ObExprUnixTimestamp::~ObExprUnixTimestamp()
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{}
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int ObExprUnixTimestamp::calc_result_typeN(
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ObExprResType& type, ObExprResType* type_array, int64_t param, ObExprTypeCtx& type_ctx) const
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{
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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_null();
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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, 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(date_obj.get_string(), cvrt_ctx, utz_value, &scale))) {
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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, NULL, 0, CM_NONE, CS_TYPE_INVALID, 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 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, 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::calc_resultN(
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ObObj& result, const ObObj* date_array, int64_t param, common::ObExprCtx& expr_ctx) const
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{
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int ret = OB_SUCCESS;
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if (OB_ISNULL(date_array) || OB_ISNULL(expr_ctx.phy_plan_ctx_)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid argument.", K(ret));
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} else {
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ObObj date;
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if (0 == param) {
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if (!expr_ctx.phy_plan_ctx_->has_cur_time()) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("physical plan context don't have current time value", K(ret));
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} else {
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date = expr_ctx.phy_plan_ctx_->get_cur_time();
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}
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} else if (1 == param) {
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date = date_array[0];
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} else {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("param is not right", K(ret));
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}
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EXPR_DEFINE_CAST_CTX(expr_ctx, CM_NONE);
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// here use result_type_
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if (OB_SUCCESS == ret && OB_FAIL(calc(result, date, result_type_, cast_ctx))) {
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LOG_WARN("calc date value failed", K(ret));
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}
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}
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return ret;
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}
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int ObExprUnixTimestamp::calc(ObObj& result, const ObObj& date, const ObExprResType& res_type, ObCastCtx& cast_ctx)
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{
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int ret = OB_SUCCESS;
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if (date.is_null()) {
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result.set_null();
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} else if (ObTimestampType != date.get_type()) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("type of date must be ObTimestampType", K(ret));
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} else {
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int64_t utz_value = 0;
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utz_value = date.get_timestamp();
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utz_value = utz_value < 0 ? 0 : utz_value;
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if (ObIntType == res_type.get_type()) {
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result.set_int(utz_value / 1000000);
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} else {
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number::ObNumber nmb;
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number::ObNumber usec;
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number::ObNumber res_nmb;
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nmb.from(utz_value, cast_ctx);
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int64_t v_usec = 1000000;
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usec.from(v_usec, cast_ctx);
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ret = nmb.div(usec, res_nmb, cast_ctx);
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if (OB_SUCC(ret)) {
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result.set_number(res_nmb);
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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 ObExprUnixTimestamp::eval_unix_timestamp(const ObExpr& expr, ObEvalCtx& ctx, 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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ObIAllocator& calc_alloc = ctx.get_reset_tmp_alloc();
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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, 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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