From 90caba6b07d4b606f6d4641a398a529926aba2ce Mon Sep 17 00:00:00 2001
From: Rui Liu <rui.liu@mongodb.com>
Date: Mon, 14 Mar 2022 20:21:38 +0000
Subject: SERVER-64474 Add null pointer assertion for index descriptor access
 during index join

---
 src/mongo/db/query/sbe_stage_builder_lookup.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/mongo/db/query/sbe_stage_builder_lookup.cpp b/src/mongo/db/query/sbe_stage_builder_lookup.cpp
index 9d682c7efb7..e42c75f868e 100644
--- a/src/mongo/db/query/sbe_stage_builder_lookup.cpp
+++ b/src/mongo/db/query/sbe_stage_builder_lookup.cpp
@@ -283,6 +283,10 @@ std::pair<SlotId, std::unique_ptr<sbe::PlanStage>> buildIndexJoinLookupStage(
     const auto indexName = index.identifier.catalogName;
     const auto indexDescriptor =
         foreignColl->getIndexCatalog()->findIndexByName(state.opCtx, indexName);
+    tassert(6447401,
+            str::stream() << "Index " << indexName
+                          << " should is unexpectedly missing for $lookup index join",
+            indexDescriptor);
     const auto indexAccessMethod =
         foreignColl->getIndexCatalog()->getEntry(indexDescriptor)->accessMethod()->asSortedData();
     const auto indexVersion = indexAccessMethod->getSortedDataInterface()->getKeyStringVersion();
-- 
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