SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayIntersect (children 1)
     ExpressionList (children 2)
      Function array (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 2)
          Literal UInt64_1
          Literal Array_[\'a\', \'b\']
        Function tuple (children 1)
         ExpressionList (children 2)
          Literal NULL
          Literal Array_[\'c\']
      Function array (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 2)
          Literal UInt64_2
          Literal Array_[\'c\', NULL]
        Function tuple (children 1)
         ExpressionList (children 2)
          Literal UInt64_1
          Literal Array_[\'a\', \'b\']