Change firstGeq to compare to param1

VersionedMap.cpp

@@ -390,6 +390,17 @@ auto operator<=>(const VersionedMap::Key &lhs, const Node &rhs) {
   return lhs.len <=> rhs.entry->keyLen;
 }
 
+auto operator<=>(const VersionedMap::Key &lhs, const VersionedMap::Key &rhs) {
+  int cl = std::min(lhs.len, rhs.len);
+  if (cl > 0) {
+    int c = memcmp(lhs.p, rhs.p, cl);
+    if (c != 0) {
+      return c <=> 0;
+    }
+  }
+  return lhs.len <=> rhs.len;
+}
+
 constexpr int orderToInt(std::strong_ordering o) {
   return o == std::strong_ordering::less    ? -1
          : o == std::strong_ordering::equal ? 0
@@ -1156,6 +1167,11 @@ void VersionedMap::Impl::firstGeq(const Key *key, const int64_t *version,
     } else {
       iterator[i].impl->mutationIndex = 0;
     }
+
+    auto m = *iterator[i];
+    if (Key{m.param1, m.param1Len} < key[i]) {
+      ++iterator[i];
+    }
   }
 }