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Merge remote-tracking branch 'origin/11.4' into 11.5
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@@ -1933,6 +1933,8 @@ static void trace_engine_stats(handler *file, Json_writer *writer)
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if (hs->pages_read_time)
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writer->add_member("pages_read_time_ms").
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add_double(hs->pages_read_time * 1000. / timer_tracker_frequency());
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if (hs->pages_prefetched)
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writer->add_member("pages_prefetch_read_count").add_ull(hs->pages_prefetched);
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if (hs->undo_records_read)
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writer->add_member("old_rows_read").add_ull(hs->undo_records_read);
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writer->end_object();
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