Update duckdb index files

.gitattributes

@@ -6,3 +6,4 @@ arbml--CQA_MD_ar/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 arbml--CQA_MD_ar/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/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:adc1f64bd3ecc3aaee20030161245e4d2480492348a3b35cbe67e2972f69a132
+size 98578432