AlterQuery  test (children 2)
 ExpressionList (children 1)
  AlterCommand MODIFY_COLUMN (children 1)
   ColumnDeclaration my.json (children 1)
    DataType JSON (children 1)
     ExpressionList (children 2)
      ASTObjectTypeArgument (children 1)
       NameTypePair a (children 1)
        DataType UInt32
      ASTObjectTypeArgument (children 1)
       NameTypePair b (children 1)
        DataType UInt32
 Identifier test
