Update makedata_ad_32_bucket_20240718: cache data1

src/main/scala/com/aliyun/odps/spark/examples/makedata_ad/v20240718/makedata_ad_32_bucket_20240718.scala

@@ -56,7 +56,7 @@ object makedata_ad_32_bucket_20240718 {
         doubles.put(r._1, jsons.getDoubleValue(r._1))
       })
       doubles
-    }).sample(false, sampleRate)
+    }).sample(false, sampleRate).cache
 
     val result = new ArrayBuffer[String]()