203 lines
7.5 KiB
C++
203 lines
7.5 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_char.h"
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#include "lib/charset/ob_charset.h"
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#include "lib/string/ob_sql_string.h"
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#include "common/sql_mode/ob_sql_mode_utils.h"
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#include "sql/session/ob_sql_session_info.h"
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#include "sql/engine/expr/ob_expr_cast.h"
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#include "sql/engine/expr/ob_expr_util.h"
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#include "sql/engine/ob_exec_context.h"
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#include "sql/ob_sql_utils.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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{
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namespace sql
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{
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#define INT32_TO_STR1(buf, int_val) *(reinterpret_cast(uchar*>(buf)) = reinterpret_cast<uchar>(int_val);
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#define INT32_TO_STR2(buf, int_val) { uint32_t temp = (uint32_t) (int_val) ;\
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(reinterpret_cast<uchar *>(buf))[1] = static_cast<uchar>(temp);\
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(reinterpret_cast<uchar *>(buf))[0] = static_cast<uchar>(temp >> 8); }
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#define INT32_TO_STR3(buf, int_val) { /* lint -save -e734 */\
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uint64_t temp= (uint64_t) (int_val);\
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(reinterpret_cast<uchar *>(buf))[2] = static_cast<uchar>(temp);\
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(reinterpret_cast<uchar *>(buf))[1] = static_cast<uchar>(temp >> 8);\
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(reinterpret_cast<uchar *>(buf))[0] = static_cast<uchar>(temp >> 16);\
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/* lint -restore */}
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#define INT32_TO_STR4(buf, int_val) { uint64_t temp = (uint64_t) (int_val);\
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(reinterpret_cast<uchar *>(buf))[3] = static_cast<uchar>(temp);\
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(reinterpret_cast<uchar *>(buf))[2] = static_cast<uchar>(temp >> 8);\
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(reinterpret_cast<uchar *>(buf))[1] = static_cast<uchar>(temp >> 16);\
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(reinterpret_cast<uchar *>(buf))[0] = static_cast<uchar>(temp >> 24); }\
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ObExprChar::ObExprChar(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_CHAR, N_CHAR, MORE_THAN_ONE, NOT_ROW_DIMENSION)
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{
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}
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ObExprChar::~ObExprChar()
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{
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}
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int ObExprChar::calc_result_typeN(ObExprResType &type, ObExprResType *types, int64_t param_num,
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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 (param_num <= 1) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid argument number, param should not less than 2", K(param_num), K(ret));
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} else if (OB_FAIL(calc_result_type(type, types[param_num-1]))) {
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LOG_WARN("failed to calc result type", K(ret));
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} else {
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//set calc type
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//i starts from 1 rather than 0 since the first param is obvarchar always.
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//see http://review.alibaba-inc.com/r/21109/ for more details when necessary.
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for (int64_t i = 0; i < param_num-1; ++i) {
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types[i].set_calc_type(ObIntType);
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}
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ObExprOperator::calc_result_flagN(type, types, param_num);
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type.set_length(static_cast<ObLength>(param_num * 4 - 4));
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}
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return ret;
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}
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int ObExprChar::calc_result_type(ObExprResType &type, ObExprResType &type1) const
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{
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int ret = OB_SUCCESS;
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ObString cs_name;
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if (ObVarcharType != type1.get_type()) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid type", K(type1), K(ret));
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} else {
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type.set_varchar();
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if (type1.is_literal()) {
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ObString charset_str = type1.get_param().get_string();
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ObCharsetType charset_type = ObCharset::charset_type(charset_str);
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if (CHARSET_INVALID == charset_type) {
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ret = OB_ERR_UNKNOWN_CHARSET;
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LOG_WARN("invalid character set", K(charset_str), K(ret));
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LOG_USER_ERROR(OB_ERR_UNKNOWN_CHARSET, charset_str.length(), charset_str.ptr());
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} else {
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type.set_collation_type(ObCharset::get_default_collation(charset_type));
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}
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} else {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid type", K(type1), K(ret));
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}
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type.set_collation_level(CS_LEVEL_COERCIBLE);
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}
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return ret;
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}
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int calc_char_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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ObSqlString str_buf;
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ObDatum *child_res = NULL;
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ObSQLSessionInfo *session = ctx.exec_ctx_.get_my_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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}
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for (int64_t i = 0; OB_SUCC(ret) && i < expr.arg_cnt_-1; ++i) {
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if (OB_FAIL(expr.args_[i]->eval(ctx, child_res))) {
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LOG_WARN("eval arg failed", K(ret), K(i));
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} else if (child_res->is_null()) {
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continue;
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} else {
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int64_t int64_val = child_res->get_int();
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int32_t int32_val = static_cast<int32_t>(int64_val);
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char buf[4]={0};
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int64_t append_len = 0;
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if (int32_val & 0xFF000000L) {
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INT32_TO_STR4(buf, int32_val);
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append_len = 4;
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} else if (int32_val & 0xFF0000L) {
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INT32_TO_STR3(buf, int32_val);
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append_len = 3;
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} else if (int32_val & 0xFF00L) {
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INT32_TO_STR2(buf, int32_val);
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append_len = 2;
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} else {
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buf[0] = static_cast<char>(int32_val);
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append_len = 1;
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}
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if (OB_FAIL(str_buf.append(buf, append_len))) {
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LOG_WARN("fail to append convert result", K(ret));
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}
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}
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}
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if (OB_SUCC(ret)) {
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//
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// convert utf8 to dest collation
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//
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ObString out;
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const ObString in_str(str_buf.length(), str_buf.ptr());
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ObEvalCtx::TempAllocGuard alloc_guard(ctx);
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ObIAllocator &tmp_alloc = alloc_guard.get_allocator();
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if (OB_FAIL(ObExprUtil::convert_string_collation(in_str, CS_TYPE_UTF8MB4_BIN, out,
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expr.datum_meta_.cs_type_, tmp_alloc))) {
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LOG_WARN("failed to convert string from utf8 to other collation", K(ret),
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K(expr.datum_meta_.cs_type_));
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}
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const int64_t res_len = out.length();
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char *res_str = expr.get_str_res_mem(ctx, res_len + 1);
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if (OB_UNLIKELY(NULL == res_str)) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_ERROR("fail to allocate memory", K(res_len), K(ret));
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} else {
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if (NULL != str_buf.ptr()) {
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MEMCPY(res_str, out.ptr(), res_len);
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}
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res_str[res_len] = '\0';
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bool is_null = false;
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ObString checked_res_str;
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bool is_strict = is_strict_mode(session->get_sql_mode());
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if (OB_FAIL(ObSQLUtils::check_well_formed_str(ObString(res_len, res_str),
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expr.datum_meta_.cs_type_,
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checked_res_str, is_null,
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is_strict))) {
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LOG_WARN("check_well_formed_str failed", K(ret), K(res_str),
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K(expr.datum_meta_));
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} else if (is_null) {
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res_datum.set_null();
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} else {
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res_datum.set_string(checked_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 ObExprChar::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_char_expr;
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return ret;
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}
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}//end of namespace sql
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}//end of namespace oceanbase
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