1 files changed, 13 insertions, 0 deletions
diff --git a/src/mongo/db/exec/sbe/values/value.h b/src/mongo/db/exec/sbe/values/value.h
index 728a0c16634..d0202b0f1c0 100644
--- a/src/mongo/db/exec/sbe/values/value.h
+++ b/src/mongo/db/exec/sbe/values/value.h
@@ -154,6 +154,9 @@ enum class TypeTags : uint8_t {
 
     // Pointer to a IndexBounds object.
     indexBounds,
+
+    // Pointer to a classic engine match expression.
+    classicMatchExpresion,
 };
 
 inline constexpr bool isNumber(TypeTags tag) noexcept {
@@ -1249,6 +1252,10 @@ inline IndexBounds* getIndexBoundsView(Value val) noexcept {
     return reinterpret_cast<IndexBounds*>(val);
 }
 
+inline MatchExpression* getClassicMatchExpressionView(Value val) noexcept {
+    return reinterpret_cast<MatchExpression*>(val);
+}
+
 /**
  * Pattern and flags of Regex are stored in BSON as two C strings written one after another.
  *
@@ -1450,6 +1457,12 @@ inline std::pair<TypeTags, Value> copyValue(TypeTags tag, Value val) {
             return makeCopyCollator(*getCollatorView(val));
         case TypeTags::indexBounds:
             return makeCopyIndexBounds(*getIndexBoundsView(val));
+        case TypeTags::classicMatchExpresion:
+            // Beware: "shallow cloning" a match expression does not copy the underlying BSON. The
+            // original BSON must remain alive for both the original MatchExpression and the clone.
+            return {TypeTags::classicMatchExpresion,
+                    bitcastFrom<const MatchExpression*>(
+                        getClassicMatchExpressionView(val)->shallowClone().release())};
         default:
             break;
     }