Explain EXPLAIN SYNTAX (children 2)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 4)
    ExpressionList (children 2)
     Identifier id
     Identifier payload
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier tab
    Function equals (children 1)
     ExpressionList (children 2)
      Function dictGetUInt64 (children 1)
       ExpressionList (children 3)
        Literal \'dictionary_all\'
        Literal \'u64\'
        Identifier id
      Literal UInt64_64
    ExpressionList (children 2)
     OrderByElement (children 1)
      Identifier id
     OrderByElement (children 1)
      Identifier payload
