AlterQuery  alter_test (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_COLUMN (children 2)
   ColumnDeclaration AddedNested1 (children 1)
    DataType Nested (children 1)
     ExpressionList (children 2)
      NameTypePair A (children 1)
       DataType UInt32
      NameTypePair B (children 1)
       DataType UInt64
   Identifier Added2
 Identifier alter_test