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[fix](file cache) Fix slow IO for table stats procedure, introduced by …
…apache#37141 Session variable `disable_file_cache` is processed as "disposable file cache" in beta_rowset_reader.cpp. ``` if (_read_context->runtime_state != nullptr) { _read_options.io_ctx.query_id = &_read_context->runtime_state->query_id(); _read_options.io_ctx.read_file_cache = _read_context->runtime_state->query_options().enable_file_cache; _read_options.io_ctx.is_disposable = _read_context->runtime_state->query_options().disable_file_cache; } ``` We use disposable cache to avoid IO amp and avoid large amount of eviction from the cached data ("normal cache"). We cannot set the read option cache policy to "no cache" because it may cause IO amp: every page IO will cause a remote IO, which is a performance disaster.
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