Re: Merge compact/non compact commits, make aborts dynamically sized

On 03/02/2015 06:51 PM, Andres Freund wrote:
> On 2015-02-25 12:10:42 +0100, Andres Freund wrote:
>> On 2015-02-24 20:51:42 +0200, Heikki Linnakangas wrote:
>>> Regarding XactEmitCommitRecord and XactEmitAbortRecord, I wonder if you
>>> could pass an xl_xact_parsed/abort_commit struct to them, instead of the
>>> individual fields? You could then also avoid the static variables inside it,
>>> passing pointers to that struct to XLogRegisterData() instead.
>>
>> Hm, that's an idea. And rename it to xaxt_commit/abort_data?
>
> So, I just tried this, and it doesn't really seem to come out as a net
> positive. More code at the callsites and more complex code in the *Emit*
> routines. It's impossible to use [FLEXIBLE_ARRAY_MEMBER] employing
> datatypes in xact_commit_data while emitting because there obviously are
> several chunks needing it. And avoid using it would make for a slightly
> less clear format.
>
> So unless you feel strongly about it, don't think so, I'll keep the
> statics, even if they're not particularly pretty.

Come to think of it, it would be cleaner anyway to move the
XLogBeginInsert() and XLogInsert() calls inside XactEmitCommitRecord.
Then those structs don't need to be static either.

- Heikki