Update duckdb index files

.gitattributes

@@ -2,3 +2,4 @@ arbml--NileULex/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 arbml--NileULex/parquet-train.parquet filter=lfs diff=lfs merge=lfs -text
 arbml--NileULex/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet 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 sha256:33113adae8a230b2f11bf1583f5d6171c1a8ffa38bfebc32184779ad91bf4dd2
+size 1060864