fix: check for error after calling Next()

Author: olavloite

spannerlib/api/rows.go

@@ -165,6 +165,9 @@ func (rows *rows) Next(ctx context.Context) (*structpb.ListValue, error) {
 		return nil, spanner.ToSpannerError(status.Error(codes.FailedPrecondition, "cannot read more data after returning stats"))
 	}
 	ok := rows.backend.Next()
+	if !ok && rows.backend.Err() != nil {
+		return nil, rows.backend.Err()
+	}
 	if !ok {
 		rows.done = true
 		// No more rows. Read stats and return nil.

spannerlib/api/transaction_test.go

@@ -56,7 +56,7 @@ func TestBeginAndCommit(t *testing.T) {
 		t.Fatalf("ResultSetStats returned unexpected error: %v", err)
 	}
 	if g, w := stats.GetRowCountExact(), int64(testutil.UpdateBarSetFooRowCount); g != w {
-		t.Fatalf("row count mismatch\n Got: %v\nWant: %v", g, w)
+		t.Fatalf("row count mismatch for rows %d:%d:%d\n Got: %v\nWant: %v", poolId, connId, rowsId, g, w)
 	}
 	if err := CloseRows(ctx, poolId, connId, rowsId); err != nil {
 		t.Fatalf("CloseRows returned unexpected error: %v", err)
@@ -125,7 +125,7 @@ func TestBeginAndRollback(t *testing.T) {
 		t.Fatalf("ResultSetStats returned unexpected error: %v", err)
 	}
 	if g, w := stats.GetRowCountExact(), int64(testutil.UpdateBarSetFooRowCount); g != w {
-		t.Fatalf("row count mismatch\n Got: %v\nWant: %v", g, w)
+		t.Fatalf("row count mismatch for rows %d:%d:%d\n Got: %v\nWant: %v", poolId, connId, rowsId, g, w)
 	}
 	if err := CloseRows(ctx, poolId, connId, rowsId); err != nil {
 		t.Fatalf("CloseRows returned unexpected error: %v", err)

spannerlib/shared/build-java-darwin-aarch64.sh

@@ -1,2 +1,3 @@
 go build -o spannerlib.so -buildmode=c-shared shared_lib.go
+mkdir -p ../wrappers/spannerlib-java/src/main/resources/darwin-aarch64
 cp spannerlib.so ../wrappers/spannerlib-java/src/main/resources/darwin-aarch64/libspanner.dylib