Explain EXPLAIN QUERY TREE (children 2)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 1)
     Function arrayExists (children 1)
      ExpressionList (children 2)
       Function lambda (children 1)
        ExpressionList (children 2)
         Function tuple (children 1)
          ExpressionList (children 1)
           Identifier x
         Function equals (children 1)
          ExpressionList (children 2)
           Identifier x
           Literal UInt64_5
       Function materialize (children 1)
        ExpressionList (children 1)
         Function range (children 1)
          ExpressionList (children 1)
           Literal UInt64_10
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Function numbers (children 1)
        ExpressionList (children 1)
         Literal UInt64_10
