94 lines
3.1 KiB
C++
94 lines
3.1 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_user.h"
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#include "sql/engine/ob_physical_plan_ctx.h"
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#include "lib/mysqlclient/ob_mysql_result.h"
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#include "lib/mysqlclient/ob_mysql_transaction.h"
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#include "lib/string/ob_sql_string.h"
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#include "lib/mysqlclient/ob_mysql_proxy.h"
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#include "lib/oblog/ob_log_module.h"
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#include "sql/engine/ob_exec_context.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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ObExprUser::ObExprUser(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_USER, N_USER, 0, NOT_VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
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{
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}
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ObExprUser::~ObExprUser()
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{
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}
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int ObExprUser::calc_result_type0(ObExprResType &type,
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ObExprTypeCtx &type_ctx) const
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{
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UNUSED(type_ctx);
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if (lib::is_oracle_mode()) {
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// FIXME @linshen: This function returns a VARCHAR2 value in oracle mode.
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// https://docs.oracle.com/en/database/oracle/oracle-database/18/sqlrf/USER.html#GUID-AD0B927B-EFD4-4246-89B4-2D55AB3AF531
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// `Oracle Database compares values of this function with blank-padded comparison semantics.`
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// 这个比较行为是 char 的比较行为, 由于 OB 目前比较行为是跟类型关联的, 没有单独的变量控制, 所以这里返回 char.
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type.set_char();
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// DEFAULT for oracle
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type.set_collation_type(CS_TYPE_UTF8MB4_BIN);
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} else {
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type.set_varchar();
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type.set_default_collation_type();
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}
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type.set_collation_level(CS_LEVEL_SYSCONST);
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type.set_length(static_cast<ObLength>((OB_MAX_HOST_NAME_LENGTH
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+ OB_MAX_USER_NAME_LENGTH + 1)));
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const ObLengthSemantics default_length_semantics = (OB_NOT_NULL(type_ctx.get_session()) ? type_ctx.get_session()->get_actual_nls_length_semantics() : LS_BYTE);
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type.set_length_semantics(default_length_semantics);
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return OB_SUCCESS;
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}
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int ObExprUser::eval_user(const ObExpr &expr, ObEvalCtx &ctx,
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ObDatum &expr_datum)
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{
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int ret = OB_SUCCESS;
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UNUSED(expr);
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const ObBasicSessionInfo *session_info = NULL;
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if (OB_ISNULL(session_info = ctx.exec_ctx_.get_my_session())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("session info is null", K(ret));
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} else {
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if (lib::is_oracle_mode()) {
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expr_datum.set_string(session_info->get_user_name());
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} else {
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expr_datum.set_string(session_info->get_user_at_client_ip());
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}
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}
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return ret;
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}
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int ObExprUser::cg_expr(ObExprCGCtx &op_cg_ctx, const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const
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{
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UNUSED(raw_expr);
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UNUSED(op_cg_ctx);
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rt_expr.eval_func_ = ObExprUser::eval_user;
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return OB_SUCCESS;
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}
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}/* ns sql*/
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}/* ns oceanbase */
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