SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Identifier b
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier set_index
   Function and (children 1)
    ExpressionList (children 3)
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier a
       Literal UInt64_1
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier a
       Literal UInt64_1
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier b
       Literal UInt64_1
   Set
