133 lines
4.6 KiB
C++
133 lines
4.6 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_ifnull.h"
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#include "share/object/ob_obj_cast.h"
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#include "sql/engine/expr/ob_expr_promotion_util.h"
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#include "sql/session/ob_sql_session_info.h"
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namespace oceanbase
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{
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using namespace oceanbase::common;
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namespace sql
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{
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ObExprIfNull::ObExprIfNull(ObIAllocator &alloc) : ObFuncExprOperator(alloc, T_FUN_SYS_IFNULL, N_IFNULL, 2, VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
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{
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}
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ObExprIfNull::~ObExprIfNull()
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{
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}
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int ObExprIfNull::calc_result_type2(ObExprResType &type,
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ObExprResType &type1,
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ObExprResType &type2,
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ObExprTypeCtx &type_ctx) const
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{
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int ret = OB_SUCCESS;
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const ObSQLSessionInfo *session = type_ctx.get_session();
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if (OB_ISNULL(session)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("session is NULL", K(ret));
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} else if (OB_FAIL(ObExprPromotionUtil::get_nvl_type(type, type1, type2))) {
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LOG_WARN("failed to get nvl type", K(ret));
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} else if (ob_is_string_type(type.get_type()) || ob_is_json_tc(type.get_type())) {
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ObCollationLevel res_cs_level = CS_LEVEL_INVALID;
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ObCollationType res_cs_type = CS_TYPE_INVALID;
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if (OB_FAIL(ObCharset::aggregate_collation(type1.get_collation_level(), type1.get_collation_type(),
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type2.get_collation_level(), type2.get_collation_type(),
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res_cs_level, res_cs_type))) {
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LOG_WARN("failed to calc collation", K(ret));
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} else {
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type.set_collation_level(res_cs_level);
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type.set_collation_type(res_cs_type);
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}
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}
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if (OB_SUCC(ret)) {
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if (type.get_type() == type1.get_type()) {
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type.set_accuracy(type1.get_accuracy());
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} else {
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type.set_accuracy(type2.get_accuracy());
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}
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//对于 int 和uint64的混合类型，需要提升类型至decimal
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if ((ObUInt64Type == type1.get_type() || ObUInt64Type == type2.get_type())
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&& ObIntType == type.get_type()) {
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type.set_type(ObNumberType);
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type.set_accuracy(ObAccuracy::DDL_DEFAULT_ACCURACY[ObIntType].get_accuracy());
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}
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//set scale
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ObScale scale1 = type1.is_null() ? 0 : type1.get_scale();
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ObScale scale2 = type2.is_null() ? 0 : type2.get_scale();
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if (-1 != scale1 && -1 != scale2) {
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type.set_scale(static_cast<ObScale>(max(scale1, scale2)));
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} else {
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type.set_scale(-1);
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}
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if (lib::is_mysql_mode() && SCALE_UNKNOWN_YET != type.get_scale()) {
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if (ob_is_real_type(type.get_type())) {
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type.set_precision(static_cast<ObPrecision>(ObMySQLUtil::float_length(type.get_scale())));
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} else if (ob_is_number_tc(type.get_type())) { // TODO:@zuojiao.hzj add decimal_int here
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const int16_t intd1 = type1.get_precision() - type1.get_scale();
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const int16_t intd2 = type2.get_precision() - type2.get_scale();
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const int16_t prec = MAX(type.get_precision(), MAX(intd1, intd2) + type.get_scale());
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type.set_precision(static_cast<ObPrecision>(prec));
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}
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}
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type.set_length(MAX(type1.get_length(), type2.get_length()));
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type1.set_calc_meta(type.get_obj_meta());
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type1.set_calc_accuracy(type.get_accuracy());
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type2.set_calc_meta(type.get_obj_meta());
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type2.set_calc_accuracy(type.get_accuracy());
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}
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return ret;
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}
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int ObExprIfNull::calc_ifnull_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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// ifnull(arg0, arg1);
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ObDatum *arg0 = NULL;
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ObDatum *arg1 = NULL;
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// MySQL ifnull是短路的
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if (OB_FAIL(expr.args_[0]->eval(ctx, arg0))) {
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LOG_WARN("eval arg0 failed", K(ret));
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} else if (!arg0->is_null()) {
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res_datum.set_datum(*arg0);
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} else if (OB_FAIL(expr.args_[1]->eval(ctx, arg1))) {
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LOG_WARN("eval arg1 failed", K(ret));
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} else {
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res_datum.set_datum(*arg1);
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}
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return ret;
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}
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int ObExprIfNull::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_ifnull_expr;
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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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