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import os
import timeit
from os.path import join
import polars as pl
from linetimer import CodeTimer, linetimer
from polars import testing as pl_test
from common_utils import (
ANSWERS_BASE_DIR,
DATASET_BASE_DIR,
FILE_TYPE,
INCLUDE_IO,
LOG_TIMINGS,
SHOW_RESULTS,
append_row,
)
SHOW_PLAN = bool(os.environ.get("SHOW_PLAN", False))
STREAMING = bool(os.environ.get("STREAMING", False))
def _scan_ds(path: str):
path = f"{path}.{FILE_TYPE}"
if FILE_TYPE == "parquet":
scan = pl.scan_parquet(path)
elif FILE_TYPE == "feather":
scan = pl.scan_ipc(path)
else:
raise ValueError(f"file type: {FILE_TYPE} not expected")
if INCLUDE_IO:
return scan
# return scan.collect().rechunk().lazy()
return scan
def get_query_answer(query: int, base_dir: str = ANSWERS_BASE_DIR) -> pl.LazyFrame:
answer_ldf = pl.scan_csv(
join(base_dir, f"q{query}.out"),
separator="|",
has_header=True,
try_parse_dates=True,
)
cols = answer_ldf.columns
answer_ldf = answer_ldf.select(
[pl.col(c).alias(c.strip()) for c in cols]
).with_columns([pl.col(pl.datatypes.Utf8).str.strip_chars().name.keep()])
return answer_ldf
def test_results(q_num: int, result_df: pl.DataFrame):
with CodeTimer(name=f"Testing result of polars Query {q_num}", unit="s"):
answer = get_query_answer(q_num).collect()
pl_test.assert_frame_equal(left=result_df, right=answer, check_dtype=False)
def get_line_item_ds(base_dir: str = DATASET_BASE_DIR) -> pl.LazyFrame:
return _scan_ds(join(base_dir, "lineitem"))
def get_orders_ds(base_dir: str = DATASET_BASE_DIR) -> pl.LazyFrame:
return _scan_ds(join(base_dir, "orders"))
def get_customer_ds(base_dir: str = DATASET_BASE_DIR) -> pl.LazyFrame:
return _scan_ds(join(base_dir, "customer"))
def get_region_ds(base_dir: str = DATASET_BASE_DIR) -> pl.LazyFrame:
return _scan_ds(join(base_dir, "region"))
def get_nation_ds(base_dir: str = DATASET_BASE_DIR) -> pl.LazyFrame:
return _scan_ds(join(base_dir, "nation"))
def get_supplier_ds(base_dir: str = DATASET_BASE_DIR) -> pl.LazyFrame:
return _scan_ds(join(base_dir, "supplier"))
def get_part_ds(base_dir: str = DATASET_BASE_DIR) -> pl.LazyFrame:
return _scan_ds(join(base_dir, "part"))
def get_part_supp_ds(base_dir: str = DATASET_BASE_DIR) -> pl.LazyFrame:
return _scan_ds(join(base_dir, "partsupp"))
def run_query(q_num: int, lp: pl.LazyFrame):
@linetimer(name=f"Overall execution of polars Query {q_num}", unit="s")
def query():
if SHOW_PLAN:
print(lp.explain())
with CodeTimer(name=f"Get result of polars Query {q_num}", unit="s"):
t0 = timeit.default_timer()
result = lp.collect(streaming=STREAMING)
secs = timeit.default_timer() - t0
if LOG_TIMINGS:
append_row(
solution="polars", version=pl.__version__, q=f"q{q_num}", secs=secs
)
else:
test_results(q_num, result)
if SHOW_RESULTS:
print(result)
query()
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