On Thu, Nov 18, 2021 at 4:32 PM Peter Smith <smithpb2...@gmail.com> wrote: > > On Mon, Nov 15, 2021 at 9:31 PM Amit Kapila <amit.kapil...@gmail.com> wrote: > > > > On Wed, Nov 10, 2021 at 12:36 PM Peter Smith <smithpb2...@gmail.com> wrote: > > > > > > On Mon, Nov 8, 2021 at 5:53 PM houzj.f...@fujitsu.com > > > <houzj.f...@fujitsu.com> wrote: > > > > > > > > 3) v37-0005 > > > > > > > > - no parse nodes of any kind other than Var, OpExpr, Const, BoolExpr, > > > > FuncExpr > > > > > > > > I think there could be other node type which can also be considered as > > > > simple > > > > expression, for exmaple T_NullIfExpr. > > > > > > The current walker restrictions are from a previously agreed decision > > > by Amit/Tomas [1] and from an earlier suggestion from Andres [2] to > > > keep everything very simple for a first version. > > > > > > Yes, you are right, there might be some additional node types that > > > might be fine, but at this time I don't want to add anything different > > > without getting their approval to do so. Anyway, additions like this > > > are all candidates for a future version of this row-filter feature. > > > > > > > I think we can consider T_NullIfExpr unless you see any problem with the > > same. > > Added in v40 [1] >
I've noticed that row-filters that are testing NULL cannot pass the current expression validation restrictions. e.g.1 test_pub=# create publication ptest for table t1 where (a is null); ERROR: invalid publication WHERE expression for relation "t1" HINT: only simple expressions using columns, constants and immutable system functions are allowed e.g.2 test_pub=# create publication ptest for table t1 where (a is not null); ERROR: invalid publication WHERE expression for relation "t1" HINT: only simple expressions using columns, constants and immutable system functions are allowed So I think it would be useful to permit the NullTest also. Is it OK? ------ KInd Regards, Peter Smith. Fujitsu Australia
