SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayElement (children 1)
     ExpressionList (children 2)
      Function JSONExtractKeysCaseInsensitive (children 1)
       ExpressionList (children 1)
        Literal \'{"ABC": 1, "def": 2, "GHI": 3}\'
      Literal UInt64_1
