Fixing delete util method

hudi-spark/src/main/java/org/apache/hudi/QuickstartUtils.java

@@ -28,6 +28,7 @@ import org.apache.hudi.exception.HoodieIOException;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericData;
 import org.apache.avro.generic.GenericRecord;
+import org.apache.spark.sql.Row;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -94,7 +95,7 @@ public class QuickstartUtils {
     }
 
     public static GenericRecord generateGenericRecord(String rowKey, String riderName, String driverName,
-        double timestamp) {
+                                                      double timestamp) {
       GenericRecord rec = new GenericData.Record(avroSchema);
       rec.put("uuid", rowKey);
       rec.put("ts", timestamp);
@@ -171,19 +172,15 @@ public class QuickstartUtils {
     }
 
     /**
-     * Generates new Deletes, randomly distributed across the keys above. There can be duplicates within the returned
-     * list
+     * Generates delete records for the passed in rows
      *
-     * @param n Number of deletes (including dups)
+     * @param rows List of {@link Row}s for which delete record need to be generated
      * @return list of hoodie records to delete
      */
-    public List<HoodieKey> generateDeletes(Integer n) throws IOException {
-      List<HoodieKey> deletes = new ArrayList<>();
-      for (int i = 0; i < n; i++) {
-        HoodieKey key = existingKeys.get(rand.nextInt(numExistingKeys));
-        deletes.add(key);
-      }
-      return deletes;
+    public List<String> generateDeletes(List<Row> rows) {
+      return rows.stream().map(row ->
+          convertToString(row.getAs("uuid"), row.getAs("partitionPath"))).filter(os -> os.isPresent()).map(os -> os.get())
+          .collect(Collectors.toList());
     }
 
     public void close() {
@@ -203,6 +200,16 @@ public class QuickstartUtils {
     }
   }
 
+  private static Option<String> convertToString(String uuid, String partitionPath) {
+    StringBuffer stringBuffer = new StringBuffer();
+    stringBuffer.append("{");
+    stringBuffer.append("\"ts\": 0.0,");
+    stringBuffer.append("\"uuid\": \"" + uuid + "\",");
+    stringBuffer.append("\"partitionpath\": \"" + partitionPath + "\"");
+    stringBuffer.append("}");
+    return Option.of(stringBuffer.toString());
+  }
+
   public static List<String> convertToStringList(List<HoodieRecord> records) {
     return records.stream().map(hr -> convertToString(hr)).filter(os -> os.isPresent()).map(os -> os.get())
         .collect(Collectors.toList());