CreateQuery foo (children 3)
 Identifier foo
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration Id (children 1)
    DataType Int32
   ColumnDeclaration Val (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Int32
 Storage definition (children 2)
  Function MergeTree
  Identifier Id
