alamb commented on issue #8379:
URL:
https://github.com/apache/arrow-datafusion/issues/8379#issuecomment-1836743922
I wonder what "unique" means ? Like every newly created `Expr` gets some
sort of id?
Some examples:
```rust
// would expr1 and expr2 have the same id?
let expr1 = col("foo");
let expr2 = col("foo");
```
```rust
// would expr1 and expr2 have the same id?
let expr1 = col("foo");
let expr2 = expr1.clone()
```
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