Store parquet trailer sizes in meta #2419
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This refactors the parquet file opening into a common function
This will fetch a 1000th of the block size in footer size and will cache it until it is fully opened. This reduces the roundtrips required to open a parquet file from 6 to 1 RTTs.
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simonswine
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This continues on from #2392.
Potentially we should contribute a mechanism to parquet-go