some experements with sparse minmax indexes #6667
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The compressed qual pushdown will look at presence of metadata columns in the compressed chunk, not at whether the uncompressed column is an orderby. This way, the decision on which columns have metadata is made only during the creation of compressed chunk. This doesn't introduce any behavior changes, just changes the decision about which columns have metadata to happen in a single place. This will simplify experimenting with configurable metadata columns.
Put global metadata columns first, segmentby next, orderby metadata before the compressed orderby columns. This matches the order in which they are likely to be accessed when reading from a compressed chunk.
It is about 10x faster than row-by-row decompression, so if we're going to decompress 10x less rows than the batch size, it's more efficient to decompress row-by-row.
…r' and 'akuzm/rows' into HEAD
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