Weijun-H commented on code in PR #8454:
URL: https://github.com/apache/arrow-datafusion/pull/8454#discussion_r1420125094
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datafusion/core/src/physical_optimizer/projection_pushdown.rs:
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@@ -265,6 +290,12 @@ fn try_unifying_projections(
.map(|e| Some(Arc::new(e) as _))
}
+// check if the expr trival
Review Comment:
nit:
```suggestion
/// Checks if the given expression is trivial.
/// An expression is considered trivial if it is either a `Column` or a
`Literal`.
```
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