Re: Add pgstathashindex() to get hash index table statistics.

Hi,

Please find the attached v4 patch rebased on a latest commitID in
head. I had to rebase it as the following git commit has some changes
in pgstatindex.c file due to which 'git apply' was failing.

<git-commit>
commit f21a563d25dbae153937aec062161184189478b8
Author: Peter Eisentraut <peter_e(at)gmx(dot)net>
Date: Fri Jan 20 20:29:53 2017 -0500

Move some things from builtins.h to new header files

</git-commit>

On Thu, Jan 19, 2017 at 12:27 PM, Ashutosh Sharma <ashu(dot)coek88(at)gmail(dot)com> wrote:
>> However, I've some minor comments on the patch:
>>
>> +/*
>> + * HASH_ALLOCATABLE_PAGE_SZ represents allocatable
>> + * space (pd_upper - pd_lower) on a hash page.
>> + */
>> +#define HASH_ALLOCATABLE_PAGE_SZ \
>> + BLCKSZ - \
>> + (SizeOfPageHeaderData + sizeof(HashPageOpaqueData))
>> My suggestion will be not to write "(pd_upper - pd_lower)" in the
>> comment. You may write allocatable space on a empty hash page.
>
> Accepted. Have changed the comment accordingly.
>
>>
>> + buf = ReadBufferExtended(rel, MAIN_FORKNUM, blkno,
>> RBM_NORMAL, NULL);
>> Use BAS_BULKREAD strategy to read the buffer.
>>
>
> okay, corrected. Please check the attached v3 patch with corrections.
>
> With Regards,
> Ashutosh Sharma
> EnterpriseDB: http://www.enterprisedb.com