kosiew opened a new issue, #7939:
URL: https://github.com/apache/arrow-rs/issues/7939
## Description
There is an existing test for casting `Decimal256` values (`i256::MIN` and
`i256::MAX`) to `f64`, checking for correct overflow behavior in #7887
We should add (or confirm the existence of) an equivalent test for
Decimal128, specifically testing casting i128::MAX and i128::MIN to f64 with
the following expectations:
Positive overflow results in positive infinity.
Negative overflow results in negative infinity.
This will ensure consistency in overflow handling and protect against future
regressions.
## Acceptance Criteria
Test for Decimal128 to f64 casting with i128::MAX and i128::MIN is added or
verified.
The test asserts .is_infinite() and checks the correct sign of the result.
The test style matches existing Decimal256 casting tests.
## Context
[PR follow up
action](https://github.com/apache/arrow-rs/pull/7887#discussion_r2198132684)
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