fix: TypeError: Cannot read property 'map' of undefined\n at /cube/node_modules/@cubejs-backend/server-core/src/core/RefreshScheduler.ts:349:86\n

Author: paveltiunov

packages/cubejs-server-core/src/core/RefreshScheduler.ts

@@ -346,7 +346,7 @@ export class RefreshScheduler {
         queriesCache[key] = this.refreshQueriesForPreAggregation(
           context, compilerApi, preAggregation, { ...queryingOptions, timezone }
         ).then(
-          ({ groupedPartitions }) => groupedPartitions[groupedPartitions.length - 1].map(partition => {
+          ({ groupedPartitions }) => (groupedPartitions[groupedPartitions.length - 1] || []).map(partition => {
             let cascadedPartitions: PreAggregationDescription[] = [];
             for (let j = 0; j < groupedPartitions.length - 1; j++) {
               cascadedPartitions = cascadedPartitions.concat(groupedPartitions[j]);

packages/cubejs-server-core/test/unit/RefreshScheduler.test.ts

@@ -44,6 +44,19 @@ cube('Foo', {
         incremental: true
       }
     },
+    orphaned: {
+      type: 'rollup',
+      measureReferences: [count],
+      timeDimensionReference: time,
+      granularity: 'day',
+      partitionGranularity: 'day',
+      scheduledRefresh: true,
+      refreshKey: {
+        every: '1 hour',
+        updateWindow: '1 day',
+        incremental: true
+      }
+    },
     second: {
       type: 'rollup',
       measureReferences: [total],