diff --git a/modules/blockbuilder/blockbuilder_test.go b/modules/blockbuilder/blockbuilder_test.go
index 22462e6b540..f09cfca100a 100644
--- a/modules/blockbuilder/blockbuilder_test.go
+++ b/modules/blockbuilder/blockbuilder_test.go
@@ -494,11 +494,35 @@ func BenchmarkBlockBuilder(b *testing.B) {
 		store      = newStoreWithLogger(ctx, b, logger)
 		cfg        = blockbuilderConfig(b, address)
 		client     = newKafkaClient(b, cfg.IngestStorageConfig.Kafka)
+		o          = &mockOverrides{
+			dc: backend.DedicatedColumns{
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeResource, Name: "res0", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeResource, Name: "res1", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeResource, Name: "res2", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeResource, Name: "res3", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeResource, Name: "res4", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeResource, Name: "res5", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeResource, Name: "res6", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeResource, Name: "res7", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeResource, Name: "res8", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeResource, Name: "res9", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeSpan, Name: "span0", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeSpan, Name: "span1", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeSpan, Name: "span2", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeSpan, Name: "span3", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeSpan, Name: "span4", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeSpan, Name: "span5", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeSpan, Name: "span6", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeSpan, Name: "span7", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeSpan, Name: "span8", Type: backend.DedicatedColumnTypeString},
+				backend.DedicatedColumn{Scope: backend.DedicatedColumnScopeSpan, Name: "span9", Type: backend.DedicatedColumnTypeString},
+			},
+		}
 	)
 
 	cfg.ConsumeCycleDuration = 1 * time.Hour
 
-	bb := New(cfg, logger, newPartitionRingReader(), &mockOverrides{}, store)
+	bb := New(cfg, logger, newPartitionRingReader(), o, store)
 	defer func() { require.NoError(b, bb.stopping(nil)) }()
 
 	// Startup (without starting the background consume cycle)
diff --git a/tempodb/encoding/vparquet4/schema.go b/tempodb/encoding/vparquet4/schema.go
index 64cb6299866..af3f1c26471 100644
--- a/tempodb/encoding/vparquet4/schema.go
+++ b/tempodb/encoding/vparquet4/schema.go
@@ -340,6 +340,14 @@ func attrToParquetTypeUnsupported(a *v1.KeyValue, p *Attribute) {
 // traceToParquet converts a tempopb.Trace to this schema's object model. Returns the new object and
 // a bool indicating if it's a connected trace or not
 func traceToParquet(meta *backend.BlockMeta, id common.ID, tr *tempopb.Trace, ot *Trace) (*Trace, bool) {
+	// Dedicated attribute column assignments
+	dedicatedResourceAttributes := dedicatedColumnsToColumnMapping(meta.DedicatedColumns, backend.DedicatedColumnScopeResource)
+	dedicatedSpanAttributes := dedicatedColumnsToColumnMapping(meta.DedicatedColumns, backend.DedicatedColumnScopeSpan)
+
+	return traceToParquetWithMapping(id, tr, ot, dedicatedResourceAttributes, dedicatedSpanAttributes)
+}
+
+func traceToParquetWithMapping(id common.ID, tr *tempopb.Trace, ot *Trace, dedicatedResourceAttributes, dedicatedSpanAttributes dedicatedColumnMapping) (*Trace, bool) {
 	if ot == nil {
 		ot = &Trace{}
 	}
@@ -353,10 +361,6 @@ func traceToParquet(meta *backend.BlockMeta, id common.ID, tr *tempopb.Trace, ot
 	var rootSpan *v1_trace.Span
 	var rootBatch *v1_trace.ResourceSpans
 
-	// Dedicated attribute column assignments
-	dedicatedResourceAttributes := dedicatedColumnsToColumnMapping(meta.DedicatedColumns, backend.DedicatedColumnScopeResource)
-	dedicatedSpanAttributes := dedicatedColumnsToColumnMapping(meta.DedicatedColumns, backend.DedicatedColumnScopeSpan)
-
 	ot.ResourceSpans = extendReuseSlice(len(tr.ResourceSpans), ot.ResourceSpans)
 	for ib, b := range tr.ResourceSpans {
 		ob := &ot.ResourceSpans[ib]
diff --git a/tempodb/encoding/vparquet4/wal_block.go b/tempodb/encoding/vparquet4/wal_block.go
index 627d1180c2a..8ca9bc25686 100644
--- a/tempodb/encoding/vparquet4/wal_block.go
+++ b/tempodb/encoding/vparquet4/wal_block.go
@@ -82,6 +82,8 @@ func openWALBlock(filename, path string, ingestionSlack, _ time.Duration) (commo
 		path:           path,
 		ids:            common.NewIDMap[int64](),
 		ingestionSlack: ingestionSlack,
+		dedcolsRes:     dedicatedColumnsToColumnMapping(meta.DedicatedColumns, backend.DedicatedColumnScopeResource),
+		dedcolsSpan:    dedicatedColumnsToColumnMapping(meta.DedicatedColumns, backend.DedicatedColumnScopeSpan),
 	}
 
 	// read all files in dir
@@ -161,6 +163,8 @@ func createWALBlock(meta *backend.BlockMeta, filepath, dataEncoding string, inge
 		path:           filepath,
 		ids:            common.NewIDMap[int64](),
 		ingestionSlack: ingestionSlack,
+		dedcolsRes:     dedicatedColumnsToColumnMapping(meta.DedicatedColumns, backend.DedicatedColumnScopeResource),
+		dedcolsSpan:    dedicatedColumnsToColumnMapping(meta.DedicatedColumns, backend.DedicatedColumnScopeSpan),
 	}
 
 	// build folder
@@ -284,6 +288,8 @@ type walBlock struct {
 	meta           *backend.BlockMeta
 	path           string
 	ingestionSlack time.Duration
+	dedcolsRes     dedicatedColumnMapping
+	dedcolsSpan    dedicatedColumnMapping
 
 	// Unflushed data
 	buffer        *Trace
@@ -331,7 +337,7 @@ func (b *walBlock) Append(id common.ID, buff []byte, start, end uint32) error {
 
 func (b *walBlock) AppendTrace(id common.ID, trace *tempopb.Trace, start, end uint32) error {
 	var connected bool
-	b.buffer, connected = traceToParquet(b.meta, id, trace, b.buffer)
+	b.buffer, connected = traceToParquetWithMapping(id, trace, b.buffer, b.dedcolsRes, b.dedcolsSpan)
 	if !connected {
 		dataquality.WarnDisconnectedTrace(b.meta.TenantID, dataquality.PhaseTraceFlushedToWal)
 	}