Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 4)
    ExpressionList (children 2)
     WithElement (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Identifier number
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Function numbers (children 1)
              ExpressionList (children 1)
               Literal UInt64_10
     WithElement (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 1)
           Literal UInt64_1 (alias xx)
          TablesInSelectQuery (children 10)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier x
           TablesInSelectQueryElement (children 2)
            TableExpression (children 1)
             TableIdentifier x (alias d1)
            TableJoin
           TablesInSelectQueryElement (children 2)
            TableExpression (children 1)
             TableIdentifier x (alias d2)
            TableJoin
           TablesInSelectQueryElement (children 2)
            TableExpression (children 1)
             TableIdentifier x (alias d3)
            TableJoin
           TablesInSelectQueryElement (children 2)
            TableExpression (children 1)
             TableIdentifier x (alias d4)
            TableJoin
           TablesInSelectQueryElement (children 2)
            TableExpression (children 1)
             TableIdentifier x (alias d5)
            TableJoin
           TablesInSelectQueryElement (children 2)
            TableExpression (children 1)
             TableIdentifier x (alias d6)
            TableJoin
           TablesInSelectQueryElement (children 2)
            TableExpression (children 1)
             TableIdentifier x (alias d7)
            TableJoin
           TablesInSelectQueryElement (children 2)
            TableExpression (children 1)
             TableIdentifier x (alias d8)
            TableJoin
           TablesInSelectQueryElement (children 2)
            TableExpression (children 1)
             TableIdentifier x (alias d9)
            TableJoin
          Function equals (children 1)
           ExpressionList (children 2)
            Identifier x.number
            Identifier d9.number
    ExpressionList (children 1)
     Identifier xx
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier cross_sales
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier xx
      Literal UInt64_2000