Update duckdb index files

.gitattributes

@@ -58,3 +58,4 @@ KaiLv--UDR_Yahoo/debug/index.duckdb filter=lfs diff=lfs merge=lfs -text
 KaiLv--UDR_Yahoo/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 sha256:19fe6dc23cfaf7782b7351cdea015a1e5947cd9a3bc96c7dbd85c24d058cf39c
+size 28848128