diff --git a/pkg/parquetquery/intern/intern.go b/pkg/parquetquery/intern/intern.go
index d146fffd59d..69d7cd153b0 100644
--- a/pkg/parquetquery/intern/intern.go
+++ b/pkg/parquetquery/intern/intern.go
@@ -6,24 +6,44 @@
 package intern
 
 import (
+	"sync"
 	"unique"
 
 	pq "github.com/parquet-go/parquet-go"
 )
 
-type Interner struct{}
+type Interner struct {
+	h   map[unique.Handle[*pq.Value]]pq.Value
+	mtx sync.Mutex
+}
 
 func New() *Interner {
-	return &Interner{}
+	return &Interner{
+		mtx: sync.Mutex{},
+		h:   make(map[unique.Handle[*pq.Value]]pq.Value),
+	}
 }
 
 // Clone returns a unique shalow copy of the input pq.Value or derefernces the
 // received pointer.
 func (i *Interner) Clone(v *pq.Value) pq.Value {
+	i.mtx.Lock()
+	defer i.mtx.Unlock()
 	switch v.Kind() {
 	case pq.ByteArray, pq.FixedLenByteArray:
-		return *unique.Make(v).Value()
+		if vv, ok := i.h[unique.Make(v)]; ok {
+			return vv
+		}
+		vv := unique.Make(v)
+		i.h[vv] = *vv.Value()
+		return i.h[vv]
 	default:
 		return *v
 	}
 }
+
+func (i *Interner) Close() {
+	i.mtx.Lock()
+	defer i.mtx.Unlock()
+	clear(i.h)
+}
diff --git a/pkg/parquetquery/iters.go b/pkg/parquetquery/iters.go
index bef5f7d0202..10563e6eaed 100644
--- a/pkg/parquetquery/iters.go
+++ b/pkg/parquetquery/iters.go
@@ -1261,6 +1261,9 @@ func (c *SyncIterator) Close() {
 	c.closeCurrRowGroup()
 
 	c.span.End()
+	if c.intern {
+		c.interner.Close()
+	}
 }
 
 // ColumnIterator asynchronously iterates through the given row groups and column. Applies