message: Default to DEFAULT_SCHEMA instead of INVALID_SCHEMA for copy statements
diff: @@ -187,7 +187,7 @@ unique_ptr<CopyStatement> Transformer::TransformCopy(postgres::Node *node) {
  // copy file into table
  auto &table = *reinterpret_cast<BaseTableRef *>(ref.get());
  info.table = table.table_name;
  - info.schema = table.schema_name;
  + info.schema = table.schema_name.empty() ? DEFAULT_SCHEMA : table.schema_name;
  } else {
  // copy table into file, generate SELECT * FROM table;
  auto statement = make_unique<SelectNode>();
  