message: using namespace is gone from transformer
diff: @@ -168,13 +168,13 @@ unique_ptr<ParsedExpression> Transformer::TransformAExpr(duckdb_libpgquery::PGAE
  return move(result);
  }
  }
  - case PG_AEXPR_NOT_DISTINCT: {
  + case duckdb_libpgquery::PG_AEXPR_NOT_DISTINCT: {
  auto left_expr = TransformExpression(root->lexpr);
  auto right_expr = TransformExpression(root->rexpr);
  return make_unique<ComparisonExpression>(ExpressionType::COMPARE_NOT_DISTINCT_FROM, move(left_expr),
  move(right_expr));
  }
  - case PG_AEXPR_DISTINCT: {
  + case duckdb_libpgquery::PG_AEXPR_DISTINCT: {
  auto left_expr = TransformExpression(root->lexpr);
  auto right_expr = TransformExpression(root->rexpr);
  return make_unique<ComparisonExpression>(ExpressionType::COMPARE_DISTINCT_FROM, move(left_expr),
  