Build Scanner with nested column projection and limit / offset push down. #61
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A code snippet to run import time
import duckdb
import lance
ds = lance.dataset("s3://eto-ops-testing/coco.lance")
start = time.time()
scan = lance.scanner(ds, columns=["annotations.label"], limit=10)
print(duckdb.query(
"SELECT annotations.label, count(1) FROM (SELECT UNNEST(annotations) as annotations FROM scan) GROUP BY 1"))
end = time.time()
print(f"Query time: {end - start}") |
changhiskhan
approved these changes
Jul 31, 2022
| builder.get().Project([tobytes(c) for c in columns]) | ||
| if filter is not None: | ||
| builder.get().Filter(_bind(filter, dataset.schema())) | ||
| if limit is not None: |
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Silly edge case but offset is ignored if limit isn't specified. May want to document that
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SQL standard does not support offset w/o LIMIT IIRC.
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