phillipleblanc opened a new issue, #10197:
URL: https://github.com/apache/datafusion/issues/10197
### Describe the bug
I'm using the Unparser.expr_to_sql function to translate a DataFusion `Expr`
into an expression for Spark Connect. Unlike most SQL engines, Spark doesn't
like quoting the column identifiers. I want to be able to generate an
expression like `a > 4` but currently I can only get `"a" > 4`
I believe this might be useful beyond Spark for other database systems that
can handle unquoted column identifiers.
### To Reproduce
```rust
use datafusion_expr::{col, lit};
use datafusion_sql::unparser::Unparser;
let expr = col("a").gt(lit(4));
let spark_dialect = CustomDialect::new(None);
let unparser = Unparser::new(&spark_dialect);
let sql = unparser.expr_to_sql(&expr).unwrap();
assert_eq!(format!("{}", sql), "(\"a\" > 4)")
```
### Expected behavior
```rust
use datafusion_expr::{col, lit};
use datafusion_sql::unparser::Unparser;
let expr = col("a").gt(lit(4));
let spark_dialect = CustomDialect::new(None);
let unparser = Unparser::new(&spark_dialect);
let sql = unparser.expr_to_sql(&expr).unwrap();
assert_eq!(format!("{}", sql), "(a > 4)")
```
### Additional context
_No response_
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