Update duckdb index files

.gitattributes

@@ -83,3 +83,4 @@ cqadupstack-physics-queries/test/index.duckdb filter=lfs diff=lfs merge=lfs -tex
 cqadupstack-gis-queries/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cqadupstack-android-corpus/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cqadupstack-programmers-corpus/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+cqadupstack-stats-corpus/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

cqadupstack-stats-corpus/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8c5778adb435fd5159031747ec86210de0faad92eaff4f0ce90ee231a6fa76bf
+size 273690624