Update duckdb index files

mathqa_other/train/index.duckdb

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:899c3ba33fb5040489aff85a731857fc1bf27c14f03405829a0844734451af0c
-size 1323008
+oid sha256:05ab884cdc68bfdde2e3b99c3b61eb7ffda2768f498722299f832bebc848a17a
+size 1060864