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perf: locate the q2 zone by name before reading its boundary #20

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Merged
pranav-walimbe merged 1 commit into from
Aug 25, 2026
Merged

perf: locate the q2 zone by name before reading its boundary #20

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21 changes: 16 additions & 5 deletions bench/spatial_bench/queries/pycanopy/q02.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,13 +17,24 @@


def pycanopy(data_paths: dict[str, str]) -> pl.DataFrame:
# The zone filter belongs in the scan so Polars decodes one boundary instead of every one
# Zone row group statistics span the whole name range so the predicate prunes no bytes
names = (
pl.scan_parquet(
data_paths["zone"], storage_options=STORAGE_OPTIONS, include_file_paths="_file"
)
.select(["z_name", "_file"])
.collect()
)
hit = names.with_row_index("_row").filter(pl.col("z_name") == ZONE_NAME).head(1)
zone_file = hit["_file"][0]
# Row offset inside its own file lets the slice skip every other row group
local_row = hit["_row"][0] - int((names["_file"] == zone_file).arg_max())

zone, trip = pl.collect_all(
[
pl.scan_parquet(data_paths["zone"], storage_options=STORAGE_OPTIONS)
.filter(pl.col("z_name") == ZONE_NAME)
.select(["z_name", "z_boundary"])
.head(1),
pl.scan_parquet(zone_file, storage_options=STORAGE_OPTIONS)
.select(["z_boundary"])
.slice(local_row, 1),
pl.scan_parquet(data_paths["trip"], storage_options=STORAGE_OPTIONS).select(
["t_pickuploc"]
),
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