alamb commented on issue #11594:
URL: https://github.com/apache/datafusion/issues/11594#issuecomment-2242687644
Here is the full example from Discord:
```rust
use datafusion::arrow::datatypes::{DataType, Field, Schema, TimeUnit};
use datafusion::optimizer::simplify_expressions::ExprSimplifier;
use datafusion::{error::Result, prelude::*};
use datafusion_common::ToDFSchema;
use datafusion_expr::execution_props::ExecutionProps;
use datafusion_expr::simplify::SimplifyContext;
#[tokio::main]
async fn main() -> Result<()> {
let schema = Schema::new(vec![make_field("i",
DataType::Int64)]).to_dfschema_ref()?;
let props = ExecutionProps::new();
let context = SimplifyContext::new(&props).with_schema(schema);
let simplifier = ExprSimplifier::new(context);
// i + (1 + 2) => i + 3
assert_eq!(
simplifier.simplify(col("i") + (lit(1) + lit(2)))?,
col("i") + lit(3)
);
// i + 1 + 2 => i + 3 # not true. Why not?
assert_eq!(
simplifier.simplify(col("i") + lit(1) + lit(2))?,
col("i") + lit(3)
);
Ok(())
}
fn make_field(name: &str, data_type: DataType) -> Field {
let nullable = false;
Field::new(name, data_type, nullable)
}
```
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