CDAP-17516 Dont populate total number of columns for table while listing the tables in the database.

Author: sagarkapare

mysql-delta-plugins/src/main/java/io/cdap/delta/mysql/MySqlTableRegistry.java

@@ -59,17 +59,11 @@ public TableList listTables() throws IOException {
     try (Connection connection = DriverManager.getConnection(getConnectionString(conf.getDatabase()),
                                                              conf.getConnectionProperties())) {
       DatabaseMetaData dbMeta = connection.getMetaData();
-      try (ResultSet tableResults = dbMeta.getTables(null, null, null, null)) {
+      try (ResultSet tableResults = dbMeta.getTables(conf.getDatabase(), null, null, null)) {
         while (tableResults.next()) {
           String tableName = tableResults.getString(3);
-          Optional<TableDetail.Builder> builder = getTableDetailBuilder(dbMeta, conf.getDatabase(), tableName);
-          if (!builder.isPresent()) {
-            // shouldn't happen
-            continue;
-          }
-          TableDetail tableDetail = builder.get().build();
-          tables.add(new TableSummary(conf.getDatabase(), tableName, tableDetail.getNumColumns(),
-                                      tableDetail.getSchema()));
+          // ignore the total number of columns for listing tables
+          tables.add(new TableSummary(conf.getDatabase(), tableName, 0, null));
         }
       }
       return new TableList(tables);

sqlserver-delta-plugins/src/main/java/io/cdap/delta/sqlserver/SqlServerTableRegistry.java

@@ -81,14 +81,8 @@ public TableList listTables() throws IOException {
             if (!tableNames.contains(tableName)) {
               continue;
             }
-            Optional<TableDetail.Builder> builder = getTableDetailBuilder(dbMeta, config.getDatabase(), tableName);
-            if (!builder.isPresent()) {
-              // shouldn't happen
-              continue;
-            }
-            TableDetail tableDetail = builder.get().build();
-            tables.add(new TableSummary(config.getDatabase(), tableName, tableDetail.getNumColumns(),
-                                        tableDetail.getSchema()));
+            // ignore the total number of columns for listing tables
+            tables.add(new TableSummary(config.getDatabase(), tableName, 0, null));
           }
         }
         return new TableList(tables);