message: clarify precomputed hashes
diff: @@ -662,7 +662,8 @@ void ExternalProbe(HashJoinGlobalSinkState &sink, HashJoinGlobalSourceState &gst
  lstate.payload.SetCardinality(lstate.probe_chunk.size());
  // Perform the probe (we already have the hashes)
  - lstate.scan_structure = sink.hash_table->Probe(lstate.join_keys, &lstate.probe_chunk.data.back());
  + auto precomputed_hashes = &lstate.probe_chunk.data.back();
  + lstate.scan_structure = sink.hash_table->Probe(lstate.join_keys, precomputed_hashes);
  lstate.scan_structure->Next(lstate.join_keys, lstate.payload, chunk);
  }
  