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105c1e099b
Summary: Forward iterator only checked `status_` and `mutable_iter_->status()`, which is not sufficient. For example, when reading exclusively from cache (kBlockCacheTier), `mutable_iter_->status()` may return kOk (e.g. there's nothing in the memtable), but one of immutable iterators could be in kIncomplete. In this case, `ForwardIterator::status()` ought to return that status instead of kOk. This diff changes `status()` to also check `imm_iters_`, `l0_iters_`, and `level_iters_`. Test Plan: ROCKSDB_TESTS=TailingIteratorIncomplete ./db_test Reviewers: ljin, igor Reviewed By: igor Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D19581