Update duckdb index files

.gitattributes

@@ -58,3 +58,4 @@ yazhou/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ltxsba_1gb/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 yazhou_5m/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ltxsba_100m/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+yazhou_20m/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

yazhou_20m/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:97ae3c310dae1a8851677e1e4a94452be04cf2d0ad294e93e258132d4bd4519f
+size 29896704