isidentical commented on code in PR #3782:
URL: https://github.com/apache/arrow-datafusion/pull/3782#discussion_r992844418
##########
datafusion/optimizer/src/simplify_expressions.rs:
##########
@@ -137,6 +179,9 @@ fn is_one(s: &Expr) -> bool {
| Expr::Literal(ScalarValue::UInt64(Some(1))) => true,
Expr::Literal(ScalarValue::Float32(Some(v))) if *v == 1. => true,
Expr::Literal(ScalarValue::Float64(Some(v))) if *v == 1. => true,
+ Expr::Literal(ScalarValue::Decimal128(Some(v), _p, _s)) => {
+ *_s < DECIMAL128_MAX_PRECISION && POWS_OF_TEN[*_s as usize] == *v
Review Comment:
Question: Is there a specific reason to embed a `POWS_OF_TEN` array instead
of dynamically calculating it at the runtime? (or the same goes to taking to
`log10()` of the `v`, instead of raising `_s`) E.g.
```rust
i128::pow(10, *_s as u32) == *v
```
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