phillipleblanc commented on code in PR #12609:
URL: https://github.com/apache/datafusion/pull/12609#discussion_r1774284699
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datafusion/sql/src/unparser/expr.rs:
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@@ -952,13 +952,25 @@ impl Unparser<'_> {
Ok(ast::Expr::Value(ast::Value::Number(f.to_string(), false)))
}
ScalarValue::Float16(None) =>
Ok(ast::Expr::Value(ast::Value::Null)),
- ScalarValue::Float32(Some(f)) => {
- Ok(ast::Expr::Value(ast::Value::Number(f.to_string(), false)))
- }
+ ScalarValue::Float32(Some(f)) => Ok(ast::Expr::Cast {
+ kind: ast::CastKind::Cast,
+ expr: Box::new(ast::Expr::Value(ast::Value::Number(
+ f.to_string(),
+ false,
+ ))),
+ data_type: self.arrow_dtype_to_ast_dtype(&DataType::Float32)?,
+ format: None,
+ }),
Review Comment:
This solves the problem of keeping the float literal types intact when
generating SQL to execute against remote systems, but it also has the side
effect of making the generated SQL a bit less human readable. Instead of just
calling `.to_string()` on the float literal, which chops off the decimal
portion if it doesn't exist - could we format it to always contain a decimal
portion? i.e. `3` -> `3.0`. That should solve the problem and keep the
generated SQL easier to understand by humans.
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