liukun4515 commented on code in PR #2357:
URL: https://github.com/apache/arrow-rs/pull/2357#discussion_r940316114
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parquet/src/arrow/array_reader/primitive_array.rs:
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@@ -208,7 +210,7 @@ where
))
}
}
- .with_precision_and_scale(p, s)?;
+ .with_precision_and_scale(p, s, false)?;
Review Comment:
> I want to take a step back before undertaking any of these, as frankly I
am deeply confused by what this precision argument is actually for - why
arbitrarily truncate your value space?
In order to represent the decimal, some system or rule just use the siged
integer to store the data, and scale/precision just as the metadata. We can get
the exact value from this two parts.
For example decimal(3,1), the value of `10.1` will be stored/encoded as 101.
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