Explain EXPLAIN AST (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 1)
     Function isNotDistinctFrom (children 1)
      ExpressionList (children 2)
       Literal Bool_0
       Function in (children 1)
        ExpressionList (children 2)
         Literal Bool_1
         Literal Tuple_(Bool_1, Bool_0)
