AlterQuery  test_prewhere_default_column (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_COLUMN (children 1)
   ColumnDeclaration OperatingSystem (children 2)
    DataType UInt64
    Function plus (children 1)
     ExpressionList (children 2)
      Identifier SessionType
      Literal UInt64_1
 Identifier test_prewhere_default_column