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Dict: gather dictionary values straight into a VarBinBuilder - #9098
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Merging this PR will improve performance by 47.2%
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Appending a string dictionary to a builder went through `take_canonical`, which first materializes the values at full logical length — allocating and re-reading a views buffer proportional to the row count. The dictionary is usually far smaller than the column, so resolving each code against it in place skips that intermediate and leaves one `memcpy` per row. The fast path indexes the codes and the dictionary's views and data buffers as host slices, so `varbin_fast_path_is_host` gates it on residency; a device-resident dictionary still takes the canonical route, where a device kernel can serve it. Signed-off-by: Robert Kruszewski <robert@spiraldb.com> Signed-off-by: Robert Kruszewski <github@robertk.io>
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Materialize dictionary values straight into VarBinBuilder instead of copying