simonvandel commented on code in PR #1879:
URL: 
https://github.com/apache/datafusion-sqlparser-rs/pull/1879#discussion_r2173771543


##########
src/ast/query.rs:
##########
@@ -2739,7 +2812,91 @@ impl fmt::Display for PipeOperator {
             PipeOperator::TableSample { sample } => {
                 write!(f, "{}", sample)
             }
+            PipeOperator::Rename { mappings } => {
+                write!(f, "RENAME {}", display_comma_separated(mappings))
+            }
+            PipeOperator::Union {
+                set_quantifier,
+                queries,
+            } => Self::fmt_set_operation(f, "UNION", set_quantifier, queries),
+            PipeOperator::Intersect {
+                set_quantifier,
+                queries,
+            } => Self::fmt_set_operation(f, "INTERSECT", set_quantifier, 
queries),
+            PipeOperator::Except {
+                set_quantifier,
+                queries,
+            } => Self::fmt_set_operation(f, "EXCEPT", set_quantifier, queries),
+            PipeOperator::Call { function, alias } => {
+                write!(f, "CALL {}", function)?;
+                Self::fmt_optional_alias(f, alias)
+            }
+            PipeOperator::Pivot {
+                aggregate_functions,
+                value_column,
+                value_source,
+                alias,
+            } => {
+                write!(
+                    f,
+                    "PIVOT({} FOR {} IN ({}))",
+                    display_comma_separated(aggregate_functions),
+                    Expr::CompoundIdentifier(value_column.to_vec()),
+                    value_source
+                )?;
+                Self::fmt_optional_alias(f, alias)
+            }
+            PipeOperator::Unpivot {
+                value_column,
+                name_column,
+                unpivot_columns,
+                alias,
+            } => {
+                write!(
+                    f,
+                    "UNPIVOT({} FOR {} IN ({}))",
+                    value_column,
+                    name_column,
+                    display_comma_separated(unpivot_columns)
+                )?;
+                Self::fmt_optional_alias(f, alias)
+            }
+            PipeOperator::Join(join) => write!(f, "{}", join),
+        }
+    }
+}
+
+impl PipeOperator {
+    /// Helper function to format optional alias for pipe operators
+    fn fmt_optional_alias(f: &mut fmt::Formatter<'_>, alias: &Option<Ident>) 
-> fmt::Result {
+        if let Some(alias) = alias {
+            write!(f, " AS {}", alias)?;
         }
+        Ok(())
+    }
+
+    /// Helper function to format set operations (UNION, INTERSECT, EXCEPT) 
with queries
+    fn fmt_set_operation(
+        f: &mut fmt::Formatter<'_>,
+        operation: &str,
+        set_quantifier: &SetQuantifier,
+        queries: &[Query],
+    ) -> fmt::Result {
+        write!(f, "{}", operation)?;
+        match set_quantifier {
+            SetQuantifier::None => {}
+            _ => {
+                write!(f, " {}", set_quantifier)?;
+            }
+        }
+        write!(f, " ")?;
+        for (i, query) in queries.iter().enumerate() {
+            if i > 0 {
+                write!(f, ", ")?;
+            }
+            write!(f, "({})", query)?;
+        }

Review Comment:
   Thanks, 
https://github.com/apache/datafusion-sqlparser-rs/pull/1879/commits/18ea4ba7c84038c5285420c75d0bd53f44161412



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