Note

Low Risk
Low risk: adds a null-check before logging in a destructor, reducing crash risk without changing read/cache behavior.

Overview
Prevents a potential crash in CachedOnDiskReadBufferFromFile::~CachedOnDiskReadBufferFromFile() by guarding filesystem cache logging with a state null-check before accessing state->read_type.

This avoids dereferencing an uninitialized read state during teardown (e.g., after exceptions) while keeping existing segment completion/cleanup logic unchanged.

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