Update duckdb index files

.gitattributes

@@ -58,3 +58,4 @@ KaiLv--UDR_Yelp/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 KaiLv--UDR_Yelp/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/debug/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2c4bc0f8d0b457ded7985ba9397ae52a97b9d8688a58c104ffcaa3677482e08e
+size 53489664