CreateQuery test_table (children 3)
 Identifier test_table
 Storage definition (children 2)
  Function MergeTree
  Identifier a
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 2)
     Identifier a_table.a
     Identifier b_table.b_arr
    TablesInSelectQuery (children 2)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Subquery (alias a_table) (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 1)
           ExpressionList (children 1)
            Function arrayJoin (alias a) (children 1)
             ExpressionList (children 1)
              Function range (children 1)
               ExpressionList (children 1)
                Literal UInt64_10000
     TablesInSelectQueryElement (children 2)
      TableExpression (children 1)
       Subquery (alias b_table) (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 1)
           ExpressionList (children 1)
            Function range (alias b_arr) (children 1)
             ExpressionList (children 1)
              Literal UInt64_10000
      TableJoin
    Set