fix(schema): failed to query variables on native oracle (#2649)

Author: yhilmare

server/plugins/connect-plugin-oracle/src/main/java/com/oceanbase/odc/plugin/connect/oracle/OracleSessionExtension.java

@@ -67,7 +67,7 @@ public String getConnectionId(Connection connection) {
 
     @Override
     public String getVariable(@NonNull Connection connection, @NonNull String variableName) {
-        String querySql = "SELECT VALUE FROM SYS.V$PARAMETER WHERE NAME = '" + variableName.toLowerCase() + "'";
+        String querySql = "SELECT VALUE FROM V$PARAMETER WHERE NAME = '" + variableName.toLowerCase() + "'";
         String value = null;
         try {
             value = JdbcOperationsUtil.getJdbcOperations(connection).queryForObject(querySql, String.class);
@@ -78,7 +78,7 @@ public String getVariable(@NonNull Connection connection, @NonNull String variab
          * nls parameters maybe null in V$PARAMETER, we need to query from V$NLS_PARAMETERS
          */
         if (Objects.isNull(value) && variableName.toLowerCase().startsWith("nls_")) {
-            querySql = "SELECT VALUE FROM SYS.V$NLS_PARAMETERS WHERE PARAMETER = '" + variableName.toUpperCase() + "'";
+            querySql = "SELECT VALUE FROM V$NLS_PARAMETERS WHERE PARAMETER = '" + variableName.toUpperCase() + "'";
             try {
                 value = JdbcOperationsUtil.getJdbcOperations(connection).queryForObject(querySql, String.class);
             } catch (Exception e) {

server/plugins/connect-plugin-oracle/src/main/java/com/oceanbase/odc/plugin/connect/oracle/OracleTraceExtension.java

@@ -41,14 +41,14 @@ public SqlExecTime getExecuteDetail(Statement statement, String version) throws
         SqlExecTime sqlExecTime = new SqlExecTime();
         try {
             String sql =
-                    "SELECT PREV_SQL_ID FROM SYS.V$SESSION WHERE SID = SYS_CONTEXT('USERENV', 'SID') and AUDSID=SYS_CONTEXT('USERENV', 'SESSIONID')";
+                    "SELECT PREV_SQL_ID FROM V$SESSION WHERE SID = SYS_CONTEXT('USERENV', 'SID') and AUDSID=SYS_CONTEXT('USERENV', 'SESSIONID')";
             String preSqlId = null;
             ResultSet rs = statement.executeQuery(sql);
             while (rs.next()) {
                 preSqlId = rs.getString("PREV_SQL_ID");
             }
             Validate.notNull(preSqlId, "PREV_SQL_ID can not be null");
-            sql = "select SQL_TEXT, ELAPSED_TIME, LAST_ACTIVE_TIME FROM SYS.V$SQL WHERE SQL_ID='" + preSqlId
+            sql = "select SQL_TEXT, ELAPSED_TIME, LAST_ACTIVE_TIME FROM V$SQL WHERE SQL_ID='" + preSqlId
                     + "' ORDER BY LAST_ACTIVE_TIME DESC";
             ResultSet resultSet = statement.executeQuery(sql);
             if (resultSet.next()) {