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src/sql/engine/expr/ob_expr_uid.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_uid.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/session/ob_sql_session_info.h"
+#include "share/schema/ob_schema_getter_guard.h"
+#include "sql/engine/ob_exec_context.h"
+
+using namespace oceanbase::common;
+using namespace oceanbase::sql;
+
+namespace oceanbase {
+namespace sql {
+
+ObExprUid::ObExprUid(ObIAllocator& alloc) : ObFuncExprOperator(alloc, T_FUN_SYS_UID, N_UID, 0, NOT_ROW_DIMENSION)
+{}
+
+ObExprUid::~ObExprUid()
+{}
+
+int ObExprUid::calc_result_type0(ObExprResType& type, ObExprTypeCtx& type_ctx) const
+{
+  UNUSED(type_ctx);
+  if (share::is_oracle_mode()) {
+    type.set_number();
+    type.set_precision(PRECISION_UNKNOWN_YET);
+    type.set_scale(ORA_NUMBER_SCALE_UNKNOWN_YET);
+  } else {
+    type.set_uint64();
+  }
+  return OB_SUCCESS;
+}
+
+int ObExprUid::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 if (!share::is_oracle_mode()) {
+    ret = OB_NOT_SUPPORTED;
+    LOG_WARN("UID function is supported by Oracle mode", K(ret), K(share::is_oracle_mode()));
+  } else {
+    const uint64_t sess_uid = session_info->get_user_id();
+    // result.set_uint64_value(sess_uid);
+    number::ObNumber num;
+    num.from(sess_uid, *(expr_ctx.calc_buf_));
+    result.set_number(num);
+  }
+  return ret;
+}
+
+int ObExprUid::eval_uid(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 {
+    char local_buff[number::ObNumber::MAX_BYTE_LEN];
+    ObDataBuffer local_alloc(local_buff, number::ObNumber::MAX_BYTE_LEN);
+    number::ObNumber num;
+    if (OB_FAIL(num.from(session_info->get_user_id(), local_alloc))) {
+      LOG_WARN("failed to convert int to number", K(ret));
+    } else {
+      expr_datum.set_number(num);
+    }
+  }
+  return ret;
+}
+
+int ObExprUid::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_ = ObExprUid::eval_uid;
+  return OB_SUCCESS;
+}
+
+}  // namespace sql
+}  // namespace oceanbase