diff --git a/runtime/exec/environment.go b/runtime/exec/environment.go
index de564a1cf3..a3f495ed04 100644
--- a/runtime/exec/environment.go
+++ b/runtime/exec/environment.go
@@ -172,6 +172,13 @@ func (c *closePuller) Pull(done bool) (sbuf.Batch, error) {
 }
 
 func (e *Environment) VectorOpen(ctx context.Context, sctx *super.Context, path, format string, p sbuf.Pushdown, concurrentReaders int) (VectorConcurrentPuller, error) {
+	if format != "csup" && format != "fjson" && format != "parquet" {
+		sbufPuller, err := e.Open(ctx, sctx, path, format, p)
+		if err != nil {
+			return nil, err
+		}
+		return sbuf.NewDematerializer(sctx, sbufPuller), nil
+	}
 	if path == "-" {
 		path = "stdio:stdin"
 	}
@@ -192,13 +199,32 @@ func (e *Environment) VectorOpen(ctx context.Context, sctx *super.Context, path,
 	case "fjson":
 		puller = fjsonio.NewVectorReader(ctx, sctx, reader, p, concurrentReaders)
 	default:
-		var sbufPuller sbuf.Puller
-		sbufPuller, err = e.Open(ctx, sctx, path, format, p)
-		puller = sbuf.NewDematerializer(sctx, sbufPuller)
+		panic(format)
 	}
 	if err != nil {
 		reader.Close()
-		return nil, err
+		return nil, fmt.Errorf("%s: %w", path, err)
+	}
+	return &errorPrefixConcurrentPuller{puller, path}, nil
+}
+
+type errorPrefixConcurrentPuller struct {
+	VectorConcurrentPuller
+	prefix string
+}
+
+func (e *errorPrefixConcurrentPuller) ConcurrentPull(done bool, id int) (vector.Any, error) {
+	vec, err := e.VectorConcurrentPuller.ConcurrentPull(done, id)
+	if err != nil {
+		err = fmt.Errorf("%s: %w", e.prefix, err)
+	}
+	return vec, err
+}
+
+func (e *errorPrefixConcurrentPuller) Pull(done bool) (vector.Any, error) {
+	vec, err := e.VectorConcurrentPuller.Pull(done)
+	if err != nil {
+		err = fmt.Errorf("%s: %w", e.prefix, err)
 	}
-	return puller, nil
+	return vec, err
 }
diff --git a/sio/csupio/vectorreader.go b/sio/csupio/vectorreader.go
index 8950b80a78..83e0da7a72 100644
--- a/sio/csupio/vectorreader.go
+++ b/sio/csupio/vectorreader.go
@@ -37,6 +37,10 @@ func NewVectorReader(ctx context.Context, sctx *super.Context, r io.Reader, p sb
 	if !ok {
 		return nil, errors.New("Super Columnar requires a seekable input")
 	}
+	var buf [1]byte
+	if _, err := ra.ReadAt(buf[:], 0); err != nil {
+		return nil, errors.New("Super Columnar requires a seekable input")
+	}
 	var metaFilters []*metafilter
 	if p != nil {
 		filter, _, err := p.MetaFilter()
diff --git a/sio/csupio/ztests/stdin-error.yaml b/sio/csupio/ztests/stdin-error.yaml
index 296f3f0949..7ce29311dd 100644
--- a/sio/csupio/ztests/stdin-error.yaml
+++ b/sio/csupio/ztests/stdin-error.yaml
@@ -2,6 +2,8 @@ script: |
   super -f csup -o t.csup in.sup
   ! cat t.csup | super -i csup -
 
+vector: true
+
 inputs:
   - name: in.sup
     data: |
diff --git a/sio/fjsonio/ztests/parser-error.yaml b/sio/fjsonio/ztests/parser-error.yaml
index e29e4db399..247ff92898 100644
--- a/sio/fjsonio/ztests/parser-error.yaml
+++ b/sio/fjsonio/ztests/parser-error.yaml
@@ -1,6 +1,8 @@
 # Test parse error on EOF.
 spq: pass
 
+vector: true
+
 input-flags: '-i fjson'
 
 input: |