SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   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)
          Function tupleElement (children 1)
           ExpressionList (children 2)
            Identifier x
            Literal UInt64_1
          Literal \'pattern\'
      Function CAST (children 1)
       ExpressionList (children 2)
        Function array (children 1)
         ExpressionList (children 1)
          Function tuple (children 1)
           ExpressionList (children 2)
            Literal \'a\'
            Literal UInt64_1
        Literal \'Array(Tuple(LowCardinality(String), UInt8))\'
