From 82e172dd3e82dd3dcbb7ece6445b21629d4a8885 Mon Sep 17 00:00:00 2001
From: Yousuf Ansari <141269047+YousufFFFF@users.noreply.github.com>
Date: Sun, 18 Jan 2026 03:03:33 +0530
Subject: [PATCH] fix(mixed-timeseries): prevent duplicate legend entries
 (#37217)

(cherry picked from commit a77c2d550c659e3020211e353296ccb891d927d3)
---
 .../src/MixedTimeseries/transformProps.ts      | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/superset-frontend/plugins/plugin-chart-echarts/src/MixedTimeseries/transformProps.ts b/superset-frontend/plugins/plugin-chart-echarts/src/MixedTimeseries/transformProps.ts
index 28c50d99616..3b250597d61 100644
--- a/superset-frontend/plugins/plugin-chart-echarts/src/MixedTimeseries/transformProps.ts
+++ b/superset-frontend/plugins/plugin-chart-echarts/src/MixedTimeseries/transformProps.ts
@@ -242,8 +242,10 @@ export default function transformProps(
     },
   );
 
-  const MetricDisplayNameA = getMetricDisplayName(metrics[0], verboseMap);
-  const MetricDisplayNameB = getMetricDisplayName(metricsB[0], verboseMap);
+  const MetricDisplayNameA: string =
+    getMetricDisplayName(metrics[0], verboseMap) || '';
+  const MetricDisplayNameB: string =
+    getMetricDisplayName(metricsB[0], verboseMap) || '';
 
   const dataTypes = getColtypesMapping(queriesData[0]);
   const xAxisDataType = dataTypes?.[xAxisLabel] ?? dataTypes?.[xAxisOrig];
@@ -398,10 +400,12 @@ export default function transformProps(
 
     if (groupby.length > 0) {
       // When we have groupby, format as "metric, dimension"
-      const metricPart = showQueryIdentifiers
+      const metricPart: string = showQueryIdentifiers
         ? `${MetricDisplayNameA} (Query A)`
         : MetricDisplayNameA;
-      displayName = `${metricPart}, ${entryName}`;
+      displayName = entryName.includes(metricPart)
+        ? entryName
+        : `${metricPart}, ${entryName}`;
     } else {
       // When no groupby, format as just the entry name with optional query identifier
       displayName = showQueryIdentifiers ? `${entryName} (Query A)` : entryName;
@@ -469,10 +473,12 @@ export default function transformProps(
 
     if (groupbyB.length > 0) {
       // When we have groupby, format as "metric, dimension"
-      const metricPart = showQueryIdentifiers
+      const metricPart: string = showQueryIdentifiers
         ? `${MetricDisplayNameB} (Query B)`
         : MetricDisplayNameB;
-      displayName = `${metricPart}, ${entryName}`;
+      displayName = entryName.includes(metricPart)
+        ? entryName
+        : `${metricPart}, ${entryName}`;
     } else {
       // When no groupby, format as just the entry name with optional query identifier
       displayName = showQueryIdentifiers ? `${entryName} (Query B)` : entryName;