CreateQuery test_array_union (children 3)
 Identifier test_array_union
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration id (children 1)
    DataType Int8
   ColumnDeclaration properties (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType String
 Storage definition (children 3)
  Function MergeTree
  Identifier id
  Set