[GitHub] [arrow-datafusion] alamb commented on a diff in pull request #6355: Add` COPY .. TO ..` syntax support

["alamb (via GitHub)" <gi...@apache.org>]

alamb commented on code in PR #6355:
URL: https://github.com/apache/arrow-datafusion/pull/6355#discussion_r1194167491


##########
datafusion/core/src/execution/context.rs:
##########
@@ -1649,45 +1653,58 @@ impl SessionState {
         // table providers for all relations referenced in this query
         let mut relations = hashbrown::HashSet::with_capacity(10);
 
-        match statement {
-            DFStatement::Statement(s) => {
-                struct RelationVisitor<'a>(&'a mut hashbrown::HashSet<ObjectName>);
+        struct RelationVisitor<'a>(&'a mut hashbrown::HashSet<ObjectName>);
+
+        impl<'a> RelationVisitor<'a> {

Review Comment:
   this simply pulls the `RelationVisitor up a level so it can be used for both `DFStatement::DescribeTableStmt` and `DFStatement::CopyTo`



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