104 lines
3.2 KiB
C++
104 lines
3.2 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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#include "sql/engine/expr/ob_expr_fun_default.h"
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#include "sql/engine/expr/ob_expr_column_conv.h"
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using namespace oceanbase::common;
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namespace oceanbase
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{
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namespace sql
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{
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ObExprFunDefault::ObExprFunDefault(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_DEFAULT, N_DEFAULT, 5, NOT_ROW_DIMENSION)
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{
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disable_operand_auto_cast();
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}
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ObExprFunDefault::~ObExprFunDefault()
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{
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}
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int ObExprFunDefault::calc_result_typeN(ObExprResType &type,
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ObExprResType *types,
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int64_t param_num,
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common::ObExprTypeCtx &type_ctx) const
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{
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//no need to set calc type of types
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UNUSED(type_ctx);
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int ret = OB_SUCCESS;
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//objs[0] type
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//objs[1] collation_type
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//objs[2] accuray_expr
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//objs[3] nullable_expr
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//objs[4] default_value
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//objs[5] column_info
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if (param_num != ObExprColumnConv::PARAMS_COUNT_WITH_COLUMN_INFO
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&& param_num != ObExprColumnConv::PARAMS_COUNT_WITHOUT_COLUMN_INFO) {
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ret = OB_INVALID_ARGUMENT;
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SQL_ENG_LOG(WARN, "invalid argument, param_num should be 5 or 6", K(param_num));
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} else {
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type.set_type(types[0].get_type());
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type.set_collation_type(types[1].get_collation_type());
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type.set_collation_level(CS_LEVEL_IMPLICIT);
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type.set_accuracy(types[2].get_accuracy());
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}
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return ret;
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}
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int ObExprFunDefault::calc_default_expr(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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//objs[0] type
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//objs[1] collation_type
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//objs[2] accuray_expr
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//objs[3] nullable_expr
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//objs[4] default_value
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//objs[5] column_info
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ObDatum *nullable = NULL;
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ObDatum *def = NULL;
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if (OB_UNLIKELY(expr.arg_cnt_ != ObExprColumnConv::PARAMS_COUNT_WITH_COLUMN_INFO
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&& expr.arg_cnt_ != ObExprColumnConv::PARAMS_COUNT_WITHOUT_COLUMN_INFO)) {
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ret = OB_INVALID_ARGUMENT_NUM;
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SQL_ENG_LOG(WARN, "arg cnt must be 5", K(ret), K(expr.arg_cnt_));
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} else if (OB_FAIL(expr.args_[3]->eval(ctx, nullable)) ||
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OB_FAIL(expr.args_[4]->eval(ctx, def))) {
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SQL_ENG_LOG(WARN, "eval arg failed", K(ret));
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} else if (def->is_null()) {
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if (!lib::is_oracle_mode() && !nullable->get_bool()) {
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ret = OB_ERR_NO_DEFAULT_FOR_FIELD;
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SQL_ENG_LOG(WARN, "Field doesn't have a default value", K(ret));
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}
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}
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if (OB_SUCC(ret)) {
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res.set_datum(*def);
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}
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return ret;
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}
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int ObExprFunDefault::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_default_expr;
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return ret;
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}
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}
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}
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