alamb commented on code in PR #12610:
URL: https://github.com/apache/datafusion/pull/12610#discussion_r1774984617
##########
datafusion/sql/src/unparser/expr.rs:
##########
@@ -219,12 +219,24 @@ impl Unparser<'_> {
}
Expr::Cast(Cast { expr, data_type }) => {
let inner_expr = self.expr_to_sql_inner(expr)?;
- Ok(ast::Expr::Cast {
- kind: ast::CastKind::Cast,
- expr: Box::new(inner_expr),
- data_type: self.arrow_dtype_to_ast_dtype(data_type)?,
- format: None,
- })
+ match data_type {
+ DataType::Dictionary(_, _) => match inner_expr {
+ // Dictionary values don't need to be cast to other
types when rewritten back to sql
Review Comment:
this is another example of where logical types as discussed in #11513 might
make sense
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