Update duckdb index files

.gitattributes

@@ -69,3 +69,4 @@ selfapr-corpus-defects4j-Time-in/train/index.duckdb filter=lfs diff=lfs merge=lf
 selfapr-corpus-defects4j-in/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 selfapr-corpus-defects4j-Lang-in/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 selfapr-corpus-defects4j-Mockito-in/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+selfapr-corpus-defects4j-Math-in/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text

selfapr-corpus-defects4j-Math-in/partial-train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:76a650946f2c47cbb227364cac02e4b7b6b915f1ca4263ac18a7c78afd1fc5c8
+size 3920900096