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src/sql/engine/expr/ob_expr_current_user.cpp

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+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#define USING_LOG_PREFIX SQL_ENG
+#include "sql/engine/expr/ob_expr_current_user.h"
+#include "sql/engine/ob_physical_plan_ctx.h"
+#include "lib/mysqlclient/ob_mysql_result.h"
+#include "lib/mysqlclient/ob_mysql_transaction.h"
+#include "lib/string/ob_sql_string.h"
+#include "lib/mysqlclient/ob_mysql_proxy.h"
+#include "lib/oblog/ob_log_module.h"
+#include "sql/engine/ob_exec_context.h"
+
+using namespace oceanbase::common;
+using namespace oceanbase::sql;
+
+namespace oceanbase {
+namespace sql {
+
+ObExprCurrentUser::ObExprCurrentUser(ObIAllocator& alloc)
+    : ObStringExprOperator(alloc, T_FUN_SYS_CURRENT_USER, N_CURRENT_USER, 0)
+{}
+
+ObExprCurrentUser::~ObExprCurrentUser()
+{}
+
+int ObExprCurrentUser::calc_result_type0(ObExprResType& type, ObExprTypeCtx& type_ctx) const
+{
+  int ret = OB_SUCCESS;
+  UNUSED(type_ctx);
+  type.set_varchar();
+  type.set_default_collation_type();
+  type.set_collation_level(CS_LEVEL_SYSCONST);
+  type.set_length(static_cast<ObLength>((OB_MAX_HOST_NAME_LENGTH + OB_MAX_USER_NAME_LENGTH + 1)));
+  return ret;
+}
+
+int ObExprCurrentUser::calc_result0(ObObj& result, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  const ObSQLSessionInfo* session_info = NULL;
+  if (OB_ISNULL(session_info = expr_ctx.my_session_)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("session info is null", K(ret));
+  } else {
+    const ObString current_user = session_info->get_user_at_host();
+    result.set_varchar(current_user);
+    result.set_collation(result_type_);
+  }
+  return ret;
+}
+
+int ObExprCurrentUser::eval_current_user(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
+{
+  int ret = OB_SUCCESS;
+  UNUSED(expr);
+  const ObBasicSessionInfo* session_info = NULL;
+  if (OB_ISNULL(session_info = ctx.exec_ctx_.get_my_session())) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("session info is null", K(ret));
+  } else {
+    expr_datum.set_string(session_info->get_user_at_host());
+  }
+  return ret;
+}
+
+int ObExprCurrentUser::cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
+{
+  UNUSED(raw_expr);
+  UNUSED(op_cg_ctx);
+  rt_expr.eval_func_ = ObExprCurrentUser::eval_current_user;
+  return OB_SUCCESS;
+}
+
+}  // namespace sql
+}  // namespace oceanbase