Adds a cache for ParquetMetaData. #16
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Which issue does this PR close?
N/A
Rationale for this change
Adds a cache for ParquetMetaData. Parsing Parquet metadata is relatively expensive, caching improves performance of repeated queries from the same file.
What changes are included in this PR?
N/A
Are there any user-facing changes?
ParquetTable::newandParquetExec::newtake an additional argument, parquet_metadata_cache.