Update duckdb index files

.gitattributes

@@ -52,3 +52,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.jpg filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
+kddcup/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

kddcup/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5b069ef42d2647111868a5b34947d225e5079d1f0f8b6218269adc3b1a8fd2e1
+size 53489664