bug(stream): panic: over_window/delta_btree_map.rs: called unwrap on None

[fuyufjh]

Describe the bug

No response

Error message/log

thread 'risingwave-streaming-actor' panicked at 'called `Option::unwrap()` on a `None` value', src/stream/src/executor/over_window/delta_btree_map.rs:224:72
stack backtrace:
...
   20:     0x562b22353f45 - core::panicking::panic::h8b995885e3e255d1
                                at /rustc/f0411ffcebcd7f75ac02ed45feb53ffd07b75398/library/core/src/panicking.rs:117:5
   21:     0x562b287b6896 - risingwave_stream::executor::over_window::delta_btree_map::CursorWithDelta<K,V>::peek_next::h44f1af3f1b81b951
   22:     0x562b287f53b4 - risingwave_stream::executor::over_window::delta_btree_map::DeltaBTreeMap<K,V>::first_key::h5abe899e786fd47f
                                at /risingwave/src/stream/src/executor/over_window/delta_btree_map.rs:57:9
   23:     0x562b287f53b4 - risingwave_stream::executor::over_window::over_partition::find_affected_ranges::hcd269d3be6a4d0dc
                                at /risingwave/src/stream/src/executor/over_window/over_partition.rs:852:8
   24:     0x562b2456b607 - risingwave_stream::executor::over_window::over_partition::OverPartition<S>::find_affected_ranges::{{closure}}::h28d3bfa8775af8d7
                                at /risingwave/src/stream/src/executor/over_window/over_partition.rs:414:21
   25:     0x562b24575942 - risingwave_stream::executor::over_window::general::OverWindowExecutor<S>::build_changes_for_partition::{{closure}}::ha86b179233def84d
                                at /risingwave/src/stream/src/executor/over_window/general.rs:463:14
   26:     0x562b24575942 - risingwave_stream::executor::over_window::general::OverWindowExecutor<S>::apply_chunk::{{closure}}::hab5b731208f75806
                                at /risingwave/src/stream/src/executor/over_window/general.rs:384:80
   27:     0x562b243ab725 - <futures_async_stream::try_stream::GenTryStream<G> as futures_core::stream::Stream>::poll_next::h78257f5cdc5caaf3
                                at /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/futures-async-stream-0.2.7/src/lib.rs:493:33
   28:     0x562b243ab725 - risingwave_stream::executor::over_window::general::OverWindowExecutor<S>::executor_inner::{{closure}}::h2f592fef51f1c5ea
                                at /risingwave/src/stream/src/executor/over_window/general.rs:593:5
   29:     0x562b243ab725 - <futures_async_stream::try_stream::GenTryStream<G> as futures_core::stream::Stream>::poll_next::h4f9288c802c41a28
                                at /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/futures-async-stream-0.2.7/src/lib.rs:493:33
   30:     0x562b2883e9c1 - <core::pin::Pin<P> as futures_core::stream::Stream>::poll_next::hc544afcf81750f54
                                at /root/.cargo/registry/src/index.crates.io-6f17d22bba15001f/futures-core-0.3.28/src/stream.rs:120:9
...

*** await tree context of current task ***

Actor 1701: `*******` [1.328s]
  Epoch 5194118303252480 [795.999ms]
    MaterializeExecutor 6A500000011 (actor 1701, operator 17) [636.000ms]
      ProjectExecutor 6A500000010 (actor 1701, operator 16) [636.000ms]
        OverWindowExecutor 6A50000000F (actor 1701, operator 15) [636.000ms]  <== current
[Detached 2]
  LocalInput (actor 1707) [648.000ms]

To Reproduce

No response

Expected behavior

No response

How did you deploy RisingWave?

No response

The version of RisingWave

No response

Additional context

No response

[fuyufjh]

Might be fixed by #12536

[stdrc]

I guess this issue is indeed fixed by #12536, for the panic message is exactly the same. May reopen if any further evidence show up.