From 764ab8bc1a1e8d9e579576109deb7d554e523fb9 Mon Sep 17 00:00:00 2001
From: fengyue-xve <1759519137@qq.com>
Date: Fri, 9 Oct 2026 09:59:20 +0000
Subject: [PATCH] test(promql): cover label_replace normalization with distinct
 series (#9485)

The duplicate-label-set rejection must not fire when a label rewrite keeps
every series distinct through another label. Normalizing mixed histogram
boundary representations (`10.0` -> `10`) while `instance` still differs is
the false positive reported in #9444. The check already accounts for it
since it became a per-timestamp row count instead of a planning-time
rejection, but no fixture covered the positive case. Add one, together
with the aggregation variant that produces a genuine duplicate and must
still fail.

Signed-off-by: fengyue-xve <1759519137@qq.com>
---
 .../standalone/common/promql/label.result     | 49 +++++++++++++++++++
 .../cases/standalone/common/promql/label.sql  | 29 +++++++++++
 2 files changed, 78 insertions(+)

diff --git a/tests/cases/standalone/common/promql/label.result b/tests/cases/standalone/common/promql/label.result
index 3fe8d559221..f6e169eebe3 100644
--- a/tests/cases/standalone/common/promql/label.result
+++ b/tests/cases/standalone/common/promql/label.result
@@ -484,3 +484,52 @@ DROP TABLE test;
 
 Affected Rows: 0
 
+-- Issue 9444 --
+-- Normalizing mixed histogram boundary representations must not be rejected while
+-- another label still tells the series apart.
+CREATE TABLE demo_bucket (
+  ts timestamp(3) time index,
+  instance STRING,
+  le STRING,
+  val DOUBLE,
+  PRIMARY KEY(instance, le),
+);
+
+Affected Rows: 0
+
+INSERT INTO TABLE demo_bucket VALUES
+    (3000000, 'a', '10', 40),
+    (3000000, 'a', '100', 50),
+    (3000000, 'a', '+Inf', 50),
+    (3000000, 'b', '10.0', 40),
+    (3000000, 'b', '100.0', 50),
+    (3000000, 'b', '1000.0', 50),
+    (3000000, 'b', '+Inf', 50);
+
+Affected Rows: 7
+
+-- SQLNESS SORT_RESULT 3 1
+TQL EVAL (3000, 3000, '5s') label_replace(demo_bucket, "le", "$1", "le", "([0-9]+)[.]0+");
+
++---------------------+------+------+----------+
+| ts                  | val  | le   | instance |
++---------------------+------+------+----------+
+| 1970-01-01T00:50:00 | 40.0 | 10   | a        |
+| 1970-01-01T00:50:00 | 40.0 | 10   | b        |
+| 1970-01-01T00:50:00 | 50.0 | +Inf | a        |
+| 1970-01-01T00:50:00 | 50.0 | +Inf | b        |
+| 1970-01-01T00:50:00 | 50.0 | 100  | a        |
+| 1970-01-01T00:50:00 | 50.0 | 100  | b        |
+| 1970-01-01T00:50:00 | 50.0 | 1000 | b        |
++---------------------+------+------+----------+
+
+-- Aggregating `instance` away first makes the same rewrite collapse two series into
+-- one label set, which is a genuine duplicate and must still fail.
+TQL EVAL (3000, 3000, '5s') label_replace(sum by (le) (demo_bucket), "le", "$1", "le", "([0-9]+)[.]0+");
+
+Error: 3001(EngineExecuteQuery), Execution error: vector cannot contain metrics with the same labelset
+
+DROP TABLE demo_bucket;
+
+Affected Rows: 0
+
diff --git a/tests/cases/standalone/common/promql/label.sql b/tests/cases/standalone/common/promql/label.sql
index 6c2d64d42ac..e269b6a1783 100644
--- a/tests/cases/standalone/common/promql/label.sql
+++ b/tests/cases/standalone/common/promql/label.sql
@@ -144,3 +144,32 @@ TQL EVAL (0, 1, '5s') test{job=""};
 TQL EVAL (0, 1, '5s') test{job!=""};
 
 DROP TABLE test;
+
+-- Issue 9444 --
+-- Normalizing mixed histogram boundary representations must not be rejected while
+-- another label still tells the series apart.
+CREATE TABLE demo_bucket (
+  ts timestamp(3) time index,
+  instance STRING,
+  le STRING,
+  val DOUBLE,
+  PRIMARY KEY(instance, le),
+);
+
+INSERT INTO TABLE demo_bucket VALUES
+    (3000000, 'a', '10', 40),
+    (3000000, 'a', '100', 50),
+    (3000000, 'a', '+Inf', 50),
+    (3000000, 'b', '10.0', 40),
+    (3000000, 'b', '100.0', 50),
+    (3000000, 'b', '1000.0', 50),
+    (3000000, 'b', '+Inf', 50);
+
+-- SQLNESS SORT_RESULT 3 1
+TQL EVAL (3000, 3000, '5s') label_replace(demo_bucket, "le", "$1", "le", "([0-9]+)[.]0+");
+
+-- Aggregating `instance` away first makes the same rewrite collapse two series into
+-- one label set, which is a genuine duplicate and must still fail.
+TQL EVAL (3000, 3000, '5s') label_replace(sum by (le) (demo_bucket), "le", "$1", "le", "([0-9]+)[.]0+");
+
+DROP TABLE demo_bucket;