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src/sql/engine/expr/ob_expr_interval.cpp
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253
src/sql/engine/expr/ob_expr_interval.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 "common/sql_mode/ob_sql_mode_utils.h"
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#include "sql/ob_sql_utils.h"
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#include "lib/utility/utility.h"
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#include "sql/engine/expr/ob_expr_interval.h"
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#include "sql/resolver/expr/ob_raw_expr.h"
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#include "sql/code_generator/ob_static_engine_expr_cg.h"
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using namespace oceanbase::common;
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namespace oceanbase {
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namespace sql {
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ObExprInterval::ObExprInterval(common::ObIAllocator& alloc)
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: ObExprOperator(alloc, T_FUN_SYS_INTERVAL, "interval", MORE_THAN_TWO, NOT_ROW_DIMENSION), use_binary_search_(true)
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{}
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OB_SERIALIZE_MEMBER((ObExprInterval, ObExprOperator), use_binary_search_);
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int ObExprInterval::assign(const ObExprOperator& other)
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{
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int ret = OB_SUCCESS;
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const ObExprInterval* tmp_other = static_cast<const ObExprInterval*>(&other);
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if (other.get_type() != T_FUN_SYS_INTERVAL) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid argument. wrong type for other", K(ret), K(other));
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} else if (this != tmp_other) {
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if (OB_FAIL(ObExprOperator::assign(other))) {
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LOG_WARN("copy in Base class ObExprOperator failed", K(ret));
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} else {
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this->use_binary_search_ = tmp_other->use_binary_search_;
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}
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}
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return ret;
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}
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int ObExprInterval::calc_result_typeN(
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ObExprResType& type, ObExprResType* types, int64_t param_num, ObExprTypeCtx& type_ctx) const
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{
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UNUSED(type_ctx);
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int ret = OB_SUCCESS;
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if (!is_mysql_mode()) {
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ret = OB_ERR_FUNCTION_UNKNOWN;
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LOG_WARN("interval expr only exists in mysql mode", K(ret));
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} else if (OB_ISNULL(types) || param_num < 2) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid argument", K(types), K(param_num), K(ret));
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} else if (OB_LIKELY(NOT_ROW_DIMENSION == row_dimension_)) {
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type.set_int();
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type.set_precision(ObAccuracy::DDL_DEFAULT_ACCURACY[ObIntType].precision_);
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type.set_scale(ObAccuracy::DDL_DEFAULT_ACCURACY[ObIntType].scale_);
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// set calc type
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common::ObObjType calc_type = types[0].get_type();
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if (calc_type != ObNumberType && calc_type != ObUNumberType)
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calc_type = ObDoubleType;
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for (int64_t i = 0; i < param_num; ++i) {
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types[i].set_calc_type(calc_type);
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}
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} else {
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ret = OB_ERR_INVALID_TYPE_FOR_OP;
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}
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return ret;
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}
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int ObExprInterval::calc_resultN(ObObj& result, const ObObj* obj_array, int64_t param_num, ObExprCtx& expr_ctx) const
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{
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UNUSED(expr_ctx);
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int ret = OB_SUCCESS;
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if (param_num < 2) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("Incorrect parameter number", K(param_num), K(ret));
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} else if (OB_ISNULL(obj_array)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("obj_array is NULL", K(ret));
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} else if (obj_array[0].is_null()) {
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result.set_int(-1);
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} else {
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const bool is_num = (ObNumberType == obj_array[0].get_type() || ObUNumberType == obj_array[0].get_type());
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LOG_DEBUG("ObExprInterval", K(is_num), K(use_binary_search_), K(obj_array[0].get_collation_type()));
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if (!use_binary_search_) {
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int64_t i = 1;
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for (; i < param_num; ++i) {
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if (obj_array[i].is_null()) {
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continue;
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} else if ((is_num ? ObObjCmpFuncs::compare_oper_nullsafe(
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obj_array[i], obj_array[0], obj_array[i].get_collation_type(), CO_GT)
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: (obj_array[i].get_double() > obj_array[0].get_double()))) {
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break;
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}
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}
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result.set_int(i - 1);
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;
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} else {
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int64_t high = param_num - 1;
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int64_t low = 1;
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int64_t mid = 0;
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while (low <= high) {
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mid = (low + high + 1) / 2;
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LOG_DEBUG("obj_array[mid]", K(obj_array[mid].is_null()), K(obj_array[mid].get_double()), K(obj_array[mid]));
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if (is_num ? ObObjCmpFuncs::compare_oper_nullsafe(
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obj_array[mid], obj_array[0], obj_array[mid].get_collation_type(), CO_GT)
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: (obj_array[mid].get_double() > obj_array[0].get_double())) {
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high = mid - 1;
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mid -= 1;
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} else if (low == high) {
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break;
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} else {
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low = mid;
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}
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} // while
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result.set_int(mid);
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} // else
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}
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return ret;
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}
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int ObExprInterval::calc_interval_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res)
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{
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int ret = OB_SUCCESS;
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ObDatum* arg0 = NULL;
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if (OB_UNLIKELY(2 > expr.arg_cnt_ || 1 != expr.inner_func_cnt_) || OB_ISNULL(expr.inner_functions_) ||
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OB_ISNULL(expr.inner_functions_[0])) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("invalid arg cnt", K(ret), K(expr.arg_cnt_));
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} else if (OB_FAIL(expr.eval_param_value(ctx, arg0))) {
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LOG_WARN("eval param failed", K(ret));
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} else if (arg0->is_null()) {
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res.set_int(-1);
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} else {
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ObDatumCmpFuncType cmp_func = reinterpret_cast<ObDatumCmpFuncType>(expr.inner_functions_[0]);
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bool use_binary_search = static_cast<bool>(expr.extra_);
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if (!use_binary_search) {
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int64_t i = 1;
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for (; i < expr.arg_cnt_; ++i) {
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const ObDatum& arg_i = expr.locate_param_datum(ctx, static_cast<int>(i));
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if (arg_i.is_null()) {
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continue;
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} else if (cmp_func(arg_i, *arg0) > 0) {
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// if arg_i > *arg0 break
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break;
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}
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}
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res.set_int(i - 1);
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;
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} else {
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int64_t high = expr.arg_cnt_ - 1;
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int64_t low = 1;
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int64_t mid = 0;
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while (low <= high) {
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const ObDatum& arg_i = expr.locate_param_datum(ctx, static_cast<int>(mid));
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mid = (low + high + 1) / 2;
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if (cmp_func(arg_i, *arg0) > 0) {
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high = mid - 1;
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mid -= 1;
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} else if (low == high) {
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break;
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} else {
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low = mid;
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}
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} // while
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res.set_int(mid);
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}
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}
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return ret;
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}
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int ObExprInterval::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(raw_expr);
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if (OB_UNLIKELY(2 > rt_expr.arg_cnt_) || OB_ISNULL(expr_cg_ctx.allocator_)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("unexpected arg cnt or allocator is NULL", K(ret), K(rt_expr.arg_cnt_), KP(expr_cg_ctx.allocator_));
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} else if (OB_ISNULL(
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rt_expr.inner_functions_ = reinterpret_cast<void**>(expr_cg_ctx.allocator_->alloc(sizeof(void*))))) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("alloc mem for inner func failed", K(ret));
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} else {
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// make sure all arg type is same
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for (int64_t i = 0; OB_SUCC(ret) && i < rt_expr.arg_cnt_; ++i) {
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const ObObjType& arg_type = rt_expr.args_[i]->datum_meta_.type_;
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if (!(ObNumberType == arg_type || ObUNumberType == arg_type || ObDoubleType == arg_type)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("all type must be number type or double type", K(ret), K(arg_type), K(i));
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}
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}
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// checking input parameters:
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// if the number of input parameters is:
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// 1. more then 8 and
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// 2. all the parameters are const and
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// 3. not null,
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// we will do a binary search during calc
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// otherwise, use sequential search
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static const int64_t MYSQL_BINARY_SEARCH_BOUND = 8;
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bool use_binary_search = true;
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const ObSysFunRawExpr* sys_fun_expr = dynamic_cast<const ObSysFunRawExpr*>(&raw_expr);
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CK(OB_NOT_NULL(sys_fun_expr));
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if (OB_SUCC(ret) && rt_expr.arg_cnt_ > MYSQL_BINARY_SEARCH_BOUND) {
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for (int64_t i = 0; OB_SUCC(ret) && i < rt_expr.arg_cnt_; ++i) {
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if (OB_ISNULL(sys_fun_expr->get_param_expr(i))) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("param expr is NULL", K(ret), K(i), K(*sys_fun_expr));
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} else if (!sys_fun_expr->get_param_expr(i)->has_const_or_const_expr_flag() ||
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!sys_fun_expr->get_param_expr(i)->is_not_null()) {
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use_binary_search = false;
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break;
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}
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}
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} else {
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use_binary_search = false;
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}
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if (OB_SUCC(ret)) {
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const ObObjType& arg_type = rt_expr.args_[0]->datum_meta_.type_;
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// do not care NULL_FIRST or NULL_LAST, will ignore null in calc_interval_expr()
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rt_expr.inner_functions_[0] = reinterpret_cast<void*>(
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ObDatumFuncs::get_nullsafe_cmp_func(arg_type, arg_type, default_null_pos(), CS_TYPE_BINARY, false));
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if (OB_ISNULL(rt_expr.inner_functions_[0])) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("cmp_func is NULL", K(ret), K(arg_type));
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} else {
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rt_expr.inner_func_cnt_ = 1;
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rt_expr.eval_func_ = calc_interval_expr;
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rt_expr.extra_ = static_cast<uint64_t>(use_binary_search);
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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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} // namespace sql
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} // namespace oceanbase
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