Cache non-exist timeseries metadata to reduce IO #16606
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When repeatedly querying a timeseries that is not in a TsFile and the bloomfilter fails to filter it, each query will result in a necessary IO.
Since TsFile is immutable, we can cache a placeholder to indicate the non-existence.
In a test, 10000 series were written into a TsFile, then 20000 series (only 10000 exist) were queried from the file.
The result shows a significant reduction in query time.
For 0.25M timeseries
For 1M timeseries