91 lines
2.7 KiB
C++
91 lines
2.7 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_char_length.h"
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namespace oceanbase
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{
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using namespace oceanbase::common;
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using namespace oceanbase::sql;
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namespace sql
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{
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ObExprCharLength::ObExprCharLength(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_CHAR_LENGTH, N_CHAR_LENGTH, 1, NOT_ROW_DIMENSION)
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{
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}
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ObExprCharLength::~ObExprCharLength()
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{
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}
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int ObExprCharLength::calc_result_type1(ObExprResType &type,
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ObExprResType &text,
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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 (text.is_null()) {
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type.set_null();
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} else {
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if (!is_type_valid(text.get_type())) {
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ret = OB_INVALID_ARGUMENT_NUM;
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LOG_WARN("the param is not castable", K(text), K(ret));
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} else {
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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(DEFAULT_SCALE_FOR_INTEGER);
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text.set_calc_type(ObVarcharType);
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text.set_calc_collation_type(text.get_collation_type());
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text.set_calc_collation_level(text.get_collation_level());
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}
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}
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return ret;
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}
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int ObExprCharLength::eval_char_length(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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ObDatum *arg = NULL;
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ObObjTypeClass in_tc = ob_obj_type_class(expr.args_[0]->datum_meta_.type_);
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if (!ob_is_castable_type_class(in_tc)) {
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res.set_null();
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} else 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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res.set_null();
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} else {
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const ObString &arg_str = arg->get_string();
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size_t length = ObCharset::strlen_char(expr.args_[0]->datum_meta_.cs_type_,
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arg_str.ptr(), arg_str.length());
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res.set_int(length);
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}
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return ret;
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}
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int ObExprCharLength::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_char_length;
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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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