From aad05e3889e245bb25575b9ae08545277d8c40f6 Mon Sep 17 00:00:00 2001
From: bwplotka <bwplotka@gmail.com>
Date: Mon, 9 Mar 2026 16:16:00 +0000
Subject: [PATCH] tsdb/record: add test for clear() on histograms

---
 tsdb/record/buffers_test.go | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 tsdb/record/buffers_test.go

diff --git a/tsdb/record/buffers_test.go b/tsdb/record/buffers_test.go
new file mode 100644
index 0000000000..688c264775
--- /dev/null
+++ b/tsdb/record/buffers_test.go
@@ -0,0 +1,35 @@
+package record
+
+import (
+	"testing"
+	"github.com/prometheus/prometheus/model/histogram"
+	"github.com/stretchr/testify/require"
+)
+
+func TestBuffersPool_PtrClear(t *testing.T) {
+	pool := NewBuffersPool()
+	
+	h := pool.GetHistograms(1)
+	h = append(h, RefHistogramSample{
+		H: &histogram.Histogram{},
+	})
+	pool.PutHistograms(h)
+
+	h2 := pool.GetHistograms(1)
+	require.Len(t, h2, 0)
+	require.Equal(t, 1, cap(h2))
+	h2 = h2[:1] // extend to capacity to check previously stored item
+	require.Nil(t, h2[0].H)
+	
+	fh := pool.GetFloatHistograms(1)
+	fh = append(fh, RefFloatHistogramSample{
+		FH: &histogram.FloatHistogram{},
+	})
+	pool.PutFloatHistograms(fh)
+
+	fh2 := pool.GetFloatHistograms(1)
+	require.Len(t, fh2, 0)
+	require.Equal(t, 1, cap(fh2))
+	fh2 = fh2[:1] // extend to capacity
+	require.Nil(t, fh2[0].FH)
+}