+1 This is great if we support in spec
On Fri, 23 Oct 2026 at 01:03, Raghvendra Yadav <[email protected]> wrote: > Hi Yuya, > > Makes sense — paying 10-20% on inserts for a sketch many queries never > touch is a bad trade. > > With two NDV types in the spec, what should a reader do when a table has > both? Theta and HLL can't be unioned, so a table with older theta blobs and > newer HLL ones can't produce one table-level NDV without recomputing. Does > a table stick to one family, do readers prefer one, or do mixed tables lose > mergeability until a rewrite? > > Also: should the blob metadata record lgK next to ndv? Otherwise a reader > merging across files can't reason about the accuracy of the result. > > Raghav > > On Wed, Oct 21, 2026 at 2:40 AM Denys Kuzmenko <[email protected]> > wrote: > >> +1 >> > > > -- > Thanks > Raghav > >
