update umbra#951
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Update the Umbra ClickBench definition: drop the primary key, ingest from the Athena hits.parquet via the umbra.parquetview table function (instead of a TSV COPY), and store the table with zstd compression (create.sql, the Docker variant, reads /data/hits.parquet from the bind mount). Switch the dataset download to hits.parquet (BENCH_DOWNLOAD_SCRIPT) to match, require the loaded row count to equal exactly 99,997,497 (a partial load otherwise sails through with implausibly fast timings on the surviving subset), and run the Docker container --privileged. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Switch to parquet for loading the data and resolve the memory usage problem during loading on smaller instances.