drrtuy commented on code in PR #3782:
URL: https://github.com/apache/arrow-datafusion/pull/3782#discussion_r993090559
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datafusion/optimizer/src/simplify_expressions.rs:
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@@ -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:
pow call make the patch lesser but will do a real multiplication instead of
a pointer deref.
This is perf degradaton IMHO. In the worst case there will be 6 such
multiplications(2 for Multiply, 2 for Divide, 2 for Modulo) and there might be
multiple scalars binary ops in the expression.
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