1.5.3. Log-based debugging, tombstones, and simple tools
Rather than fully removing the key from the map, we set the register value to null. The metadata is kept around so we can disambiguate deletions from states that simply don’t have a key yet. These are called tombstones — the ghosts of CRDTs past.，推荐阅读快连下载获取更多信息
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JOIN sys.query_store_query_text qsqt ON qsq.query_text_id = qsqt.query_text_id