SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function JSONExtract (alias v) (children 1)
     ExpressionList (children 3)
      Literal \'{"a" : "Hello"}\'
      Literal \'a\'
      Literal \'Variant(String, UInt32)\'
    Function variantType (children 1)
     ExpressionList (children 1)
      Identifier v
