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This is actually implemented now: <div class="highlight highlight-source-python no

Implement `sum` for decimal type. about polars HOT 2 CLOSED

PongPong commented on September 24, 2024

Implement `sum` for decimal type.

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stinodego commented on September 24, 2024 1

This is actually implemented now:

import polars as pl

df = pl.DataFrame({"a": ["1.1", "2.2"]}).cast(pl.Decimal(3, 1))
result = df.select(pl.col("a").sum())
print(result)

shape: (1, 1)
┌──────────────┐
│ a            │
│ ---          │
│ decimal[3,1] │
╞══════════════╡
│ 3.3          │
└──────────────┘

However, the DataFrame.sum() method does not handle Decimals properly:

shape: (1, 1)
┌──────────────┐
│ a            │
│ ---          │
│ decimal[3,1] │
╞══════════════╡
│ null         │
└──────────────┘

So I would actually classify this as a bug.

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ritchie46 commented on September 24, 2024

Decimal support is experimental so this isn't implemented yet.

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