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fix: _sql_query eviction query logic

Denis Smirnov requested to merge 928_issue into master

Summary

  • fix: _sql_query eviction query logic

There was a bug when SQL statistics LRU removed some old query from the _sql_query table. The query ref_counter field in unsigned, but the code decremented it below zero in the space on eviction. That produced an error (fixed).

  • Close #928 (closed)
  • Cherry-pick to: none
  • Docs follow-up: not necessary

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