Re: [patch]overallocate memory for curly braces in array_out
| От | Keiichi Hirobe |
|---|---|
| Тема | Re: [patch]overallocate memory for curly braces in array_out |
| Дата | |
| Msg-id | CAH=EFxEc+V=F-dO6HAPnbaZSZzqjkEJywkcxCfp=Ki=VfDEB8g@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: [patch]overallocate memory for curly braces in array_out (Tom Lane <tgl@sss.pgh.pa.us>) |
| Ответы |
Re: [patch]overallocate memory for curly braces in array_out
|
| Список | pgsql-hackers |
Hi,
Thanks for the reply.
I am not sure whether to fix another bug, but I fixed and I attached a new patch,
please check it.
Please note that I inserted a line for updating "overall_length" at line 1185.
I checked below case.
select ARRAY[ARRAY[1,2,3],ARRAY[4,5,6]]; (regular case)
select '[3:4][2:4]={{1,2,3},{4,5,6}}'::_int4; (needdims case)
select ARRAY['a"bc','def']; (needquote case)
Cheers,
Keiichi Hirobe
2018年9月24日(月) 23:46 Tom Lane <tgl@sss.pgh.pa.us>:
Keiichi Hirobe <chalenge.akane@gmail.com> writes:
> Attached is a patch that fixes a bug
> for miscounting total number of curly braces in output string in array_out.
Wow, good catch!
Testing this, I found there's a second way in which the space calculation
is off: it always allocated one more byte than required, as a result of
counting one more comma than is really required. That's not nearly as
significant as the curly-brace miscount, but it still got in the way of
doing this:
*** 1234,1239 ****
--- 1243,1251 ----
#undef APPENDSTR
#undef APPENDCHAR
+ /* Assert that we calculated the string length accurately */
+ Assert(overall_length == (p - retval + 1));
+
pfree(values);
pfree(needquotes);
which seemed to me like a good idea now that we know this code isn't
so perfect as all that.
Will push shortly.
regards, tom lane
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