vamseeachanta Common Issues
Common Issues
Issue: Out of Memory
# Solution 1: Use streaming
result = lf.collect(streaming=True)
# Solution 2: Sink to file
lf.sink_parquet("output.parquet")
# Solution 3: Process in chunks
for chunk in pl.read_csv_batched("large.csv", batch_size=100000):
process(chunk)
Issue: Slow Performance
# Check query plan for inefficiencies
print(lf.explain(optimized=True))
# Use profiling
result = lf.profile()
print(result[1]) # Timing information
Issue: Type Mismatch in Join
# Ensure matching types before join
df1 = df1.with_columns(pl.col("id").cast(pl.Int64))
df2 = df2.with_columns(pl.col("id").cast(pl.Int64))
result = df1.join(df2, on="id")
Issue: Date Parsing Errors
# Explicit format specification
df = df.with_columns([
pl.col("date_str").str.strptime(pl.Date, "%Y-%m-%d"),
pl.col("datetime_str").str.strptime(pl.Datetime, "%Y-%m-%d %H:%M:%S")
])