wudidapaopao commented on PR #25536:
URL: https://github.com/apache/datafusion/pull/25536#issuecomment-5766357354
> Could you please provide some instructions on how to reproduce these
numbers?
I converted the four non-nullable `Decimal128(15,2)` columns used by `Q1` to
`Float64` starting from the existing `TPC-H SF1` Parquet data. And then I ran
the unchanged `Q1` locally on a 14-core Apple Silicon Mac.
```Python
import pyarrow as pa
import pyarrow.compute as pc
import pyarrow.parquet as pq
source = "..."
destination = "..."
table = pq.read_table(source)
for name in [
"l_quantity",
"l_extendedprice",
"l_discount",
"l_tax",
]:
index = table.schema.get_field_index(name)
table = table.set_column(
index,
pa.field(name, pa.float64(), nullable=False),
pc.cast(table.column(index), pa.float64()),
)
pq.write_table(
table,
destination,
compression="zstd",
compression_level=1,
row_group_size=131072,
)
```
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