Update duckdb index files

.gitattributes

@@ -6,3 +6,4 @@ xusenlin--tnews/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 xusenlin--tnews/validation/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/validation/0000.parquet filter=lfs diff=lfs merge=lfs -text
+default/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:97a9ef762ae4ce0c3ea0e289d2e94e6d7b53b40a0e6f85540c7944b1e59eee04
+size 1847296