SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function equals (children 1)
     ExpressionList (children 2)
      Function position (children 1)
       ExpressionList (children 2)
        Function materialize (alias h) (children 1)
         ExpressionList (children 1)
          Literal \'abc\'
        Function lower (children 1)
         ExpressionList (children 1)
          Literal \'Bc\' (alias n)
      Function positionCaseInsensitive (children 1)
       ExpressionList (children 2)
        Identifier h
        Identifier n
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.numbers
   Literal UInt64_10