Cache collected file statistics #3649
Merged
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Which issue does this PR close?
Closes #871 (but I'm not sure about that).
Rationale for this change
Reduce I/O by collecting statistics for files (parquet) only once in
ListingTable.What changes are included in this PR?
Store collected statistics in cache per file location.
Cache is invalided when:
Are there any user-facing changes?
No.
Or maybe mention that sometimes when
collect_statsis enabled first query can be much slower due to increased I/O while collecting statistics. Cached statistics are invalidated in next query when table file has changed.