sgrebnov commented on code in PR #13880:
URL: https://github.com/apache/datafusion/pull/13880#discussion_r1895052716
##########
datafusion/sql/src/unparser/plan.rs:
##########
@@ -121,6 +124,40 @@ impl Unparser<'_> {
}
}
+ /// Try to unparse a [UserDefinedLogicalNode] to a SQL statement.
+ /// If multiple unparsers are registered for the same
[UserDefinedLogicalNode],
+ /// the last unparsing result will be returned.
+ fn extension_to_statement(
+ &self,
+ node: &dyn UserDefinedLogicalNode,
+ ) -> Result<ast::Statement> {
+ let mut statement = None;
+ for unparser in &self.udlp_unparsers {
+ statement = unparser.unparse_to_statement(node, self)?;
+ }
+ if let Some(statement) = statement {
+ Ok(statement)
+ } else {
+ not_impl_err!("Unsupported extension node: {node:?}")
+ }
+ }
+
+ /// Try to unparse a [UserDefinedLogicalNode] to a SQL statement.
+ /// If multiple unparsers are registered for the same
[UserDefinedLogicalNode],
+ /// all of them will be called in order.
+ fn extension_to_sql(
+ &self,
+ node: &dyn UserDefinedLogicalNode,
+ query: &mut Option<&mut QueryBuilder>,
+ select: &mut Option<&mut SelectBuilder>,
+ relation: &mut Option<&mut RelationBuilder>,
+ ) -> Result<()> {
+ for unparser in &self.udlp_unparsers {
Review Comment:
It might be good to add indication that `unparse` applied to be consistent
with `unparse_to_statement` and throw error if non of registered udlps applied
/ successfully processed the node.
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