> On Apr 8, 2017, at 5:13 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> I wrote:
>> Robert Haas <robertmh...@gmail.com> writes:
>>> On Sat, Apr 8, 2017 at 3:57 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:
>>> I think it's pretty dubious to change this, honestly.  Just because it
>>> would have caught this one bug doesn't make it an especially valuable
>>> thing in general.  Bytes are still not free.
>> What I think I might do is write a trial patch that turns Bitmapsets
>> into Nodes, and see if it catches any other existing bugs.  If it does
>> not, that would be good evidence for your position.
> I made the attached quick-hack patch, and found that check-world
> passes just fine with it. 

Not so for me.  I get a failure almost immediately:

Running in no-clean mode.  Mistakes will not be cleaned up.
The files belonging to this database system will be owned by user "mark".
This user must also own the server process.

The database cluster will be initialized with locales
  CTYPE:    en_US.UTF-8
  TIME:     en_US.UTF-8
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".
Data page checksums are disabled.
creating directory 
/Users/mark/hydra/postgresql/src/test/regress/./tmp_check/data ... ok
creating subdirectories ... ok
selecting default max_connections ... 100
selecting default shared_buffers ... 128MB
selecting dynamic shared memory implementation ... posix
creating configuration files ... ok
running bootstrap script ... TRAP: FailedAssertion("!(((((const 
Node*)(a))->type) == T_Bitmapset))", File: "bitmapset.c", Line: 731)
child process was terminated by signal 6: Abort trap
initdb: data directory 
"/Users/mark/hydra/postgresql/src/test/regress/./tmp_check/data" not removed at 
user's request

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