iffyio commented on code in PR #1687:
URL: 
https://github.com/apache/datafusion-sqlparser-rs/pull/1687#discussion_r1934243820


##########
src/parser/mod.rs:
##########
@@ -8866,6 +8873,24 @@ impl<'a> Parser<'a> {
         Ok((data, trailing_bracket))
     }
 
+    fn parse_returns_table_column(&mut self) -> Result<ColumnDef, ParserError> 
{
+        let name = self.parse_identifier()?;
+        let data_type = self.parse_data_type()?;
+        Ok(ColumnDef {
+            name,
+            data_type,
+            collation: None,
+            options: Vec::new(), // No constraints expected here
+        })
+    }
+
+    fn parse_parenthesized_columns(&mut self) -> Result<Vec<ColumnDef>, 
ParserError> {

Review Comment:
   ```suggestion
       fn parse_returns_table_columns(&mut self) -> Result<Vec<ColumnDef>, 
ParserError> {
   ```



##########
src/parser/mod.rs:
##########
@@ -4535,7 +4535,14 @@ impl<'a> Parser<'a> {
         self.expect_token(&Token::RParen)?;
 
         let return_type = if self.parse_keyword(Keyword::RETURNS) {
-            Some(self.parse_data_type()?)
+            if dialect_of!(self is PostgreSqlDialect | GenericDialect)
+                && self.parse_keyword(Keyword::TABLE)
+            {
+                let columns = self.parse_parenthesized_columns()?;
+                Some(DataType::Table(columns))
+            } else {
+                Some(self.parse_data_type()?)

Review Comment:
   I'm thinking the behavior here could be a bit misleading, given the variant 
`DataType::Table`, the expectation is that `self.parse_data_type()` can parse 
that variant. Would that be reasonable to do here instead (i.e. the table type 
logic is moved into `parse_data_type()` and this part becomes unchanged [likely 
no need to guard by dialect either since the syntax doesn't conflict] I imagine 
as a result)?



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