131 lines
4.2 KiB
C++
131 lines
4.2 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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#define USING_LOG_PREFIX SQL_ENG
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#include "ob_expr_right.h"
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#include <string.h>
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#include "lib/charset/ob_charset.h"
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#include "share/object/ob_obj_cast.h"
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#include "sql/parser/ob_item_type.h"
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#include "sql/session/ob_sql_session_info.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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ObExprRight::ObExprRight(ObIAllocator& alloc) : ObStringExprOperator(alloc, T_FUN_SYS_RIGHT, "right", 2)
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{}
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ObExprRight::~ObExprRight()
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{}
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int ObExprRight::calc_result_type2(
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ObExprResType& type, ObExprResType& type1, ObExprResType& type2, ObExprTypeCtx& type_ctx) const
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{
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int ret = OB_SUCCESS;
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type2.set_calc_type(ObIntType);
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type_ctx.set_cast_mode(type_ctx.get_cast_mode() | CM_STRING_INTEGER_TRUNC);
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type.set_varchar();
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type.set_length(type1.get_length());
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OZ(aggregate_charsets_for_string_result(type, &type1, 1, type_ctx.get_coll_type()));
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OX(type1.set_calc_type(ObVarcharType));
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OX(type1.set_calc_collation_type(type.get_collation_type()));
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return ret;
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}
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int do_right(const ObString& input_value, const ObCollationType& cs_type, const int64_t length, ObString& res_str)
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{
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int ret = OB_SUCCESS;
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const char* input_start = input_value.ptr();
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int64_t input_length = input_value.length();
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if (OB_ISNULL(input_start) && 0 != input_length) {
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LOG_WARN("String invalid", K(input_start), K(input_length));
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} else {
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int64_t char_beyond_end = input_length;
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int64_t wanted = min(length, input_length);
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int64_t got = 0;
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int64_t char_length = 0;
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while (OB_SUCC(ret) && (got < wanted) && (-1 < char_beyond_end)) {
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if (OB_FAIL(ObCharset::last_valid_char(cs_type, input_start, char_beyond_end, char_length))) {
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LOG_WARN("Get last valid char failed ", K(ret));
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} else {
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char_beyond_end -= char_length;
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++got;
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}
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}
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if (OB_SUCC(ret)) {
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res_str.assign_ptr(input_start + char_beyond_end, static_cast<int32_t>(input_length - char_beyond_end));
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}
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}
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return ret;
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}
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int ObExprRight::calc_result2(ObObj& result, const ObObj& obj1, const ObObj& obj2, ObExprCtx& expr_ctx) const
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{
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int ret = OB_SUCCESS;
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UNUSED(expr_ctx);
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if (obj1.is_null() || obj2.is_null()) {
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result.set_null();
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} else {
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TYPE_CHECK(obj2, ObIntType);
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int64_t length = obj2.get_int();
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ObString res_str;
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if (OB_FAIL(do_right(obj1.get_string(), obj1.get_collation_type(), length, res_str))) {
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LOG_WARN("Failed to calc", K(ret));
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} else {
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result.set_varchar(res_str);
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result.set_collation(result_type_);
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}
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}
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return ret;
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}
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int calc_right_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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// right(s, n)
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ObDatum* s_datum = NULL;
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ObDatum* n_datum = NULL;
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if (OB_FAIL(expr.args_[0]->eval(ctx, s_datum)) || OB_FAIL(expr.args_[1]->eval(ctx, n_datum))) {
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LOG_WARN("eval arg failed", K(ret), KP(s_datum), KP(n_datum));
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} else if (s_datum->is_null() || n_datum->is_null()) {
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res_datum.set_null();
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} else {
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ObString res_str;
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const ObCollationType arg_cs_type = expr.args_[0]->datum_meta_.cs_type_;
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if (OB_FAIL(do_right(s_datum->get_string(), arg_cs_type, n_datum->get_int(), res_str))) {
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LOG_WARN("failed to calculate right expression", K(ret));
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} else {
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if (res_str.empty() && is_oracle_mode()) {
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res_datum.set_null();
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} else {
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res_datum.set_string(res_str);
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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 ObExprRight::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_ = calc_right_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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