fix: print import rows count after finished (4paradigm#1401)

Made integer variable within while loop that reads lines. After loop finishes, uses System.out.println to output the number.

Author: Manny-op

java/openmldb-import/src/main/java/com/_4paradigm/openmldb/importer/Importer.java

@@ -209,16 +209,20 @@ public void Load() {
         reader.enableCheckHeader(tableMetaData);
         try {
             CSVRecord record;
+            int lines = 0;
             while ((record = reader.next()) != null) {
+                // integer gets added at the start of iteration for each line.
+                lines++;
                 Map<Integer, List<Tablet.Dimension>> dims = buildDimensions(record, keyIndexMap, tableMetaData.getPartitionNum());
-
                 // distribute the row to the bulk load generators for each MemTable(tid, pid)
                 for (Integer pid : dims.keySet()) {
                     // Note: NS pid is int
                     // no need to calc dims twice, pass it to BulkLoadGenerator
                     generators.get(pid).feed(new BulkLoadGenerator.FeedItem(dims, tsIdxSet, record));
                 }
             }
+            System.out.println("Total read rows: " + lines);
+            // after while loop is finished, print out number of lines gone through.
         } catch (Exception e) {
             logger.error("feeding failed, {}", e.getMessage());
         }