Re: [HACKERS] path toward faster partition pruning - Mailing list pgsql-hackers

From amul sul
Subject Re: [HACKERS] path toward faster partition pruning
Date
Msg-id CAAJ_b943c88pb0HjgJ41RdbJQWMqza1C=KC6cJ72NOhMiihFVA@mail.gmail.com
Whole thread Raw
In response to Re: [HACKERS] path toward faster partition pruning  (Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>)
Responses Re: [HACKERS] path toward faster partition pruning  (Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>)
List pgsql-hackers
On Mon, Nov 6, 2017 at 3:31 PM, Amit Langote
<Langote_Amit_f8@lab.ntt.co.jp> wrote:
> On 2017/11/06 14:32, David Rowley wrote:
>> On 6 November 2017 at 17:30, Amit Langote wrote:
>>> On 2017/11/03 13:32, David Rowley wrote:
>>>> On 31 October 2017 at 21:43, Amit Langote wrote:
[....]
>
> Attached updated set of patches, including the fix to make the new pruning
> code handle Boolean partitioning.
>

I am getting following warning on mac os x:

partition.c:1800:24: warning: comparison of constant -1 with
expression of type 'NullTestType'     (aka 'enum NullTestType') is always false
[-Wtautological-constant-out-of-range-compare]                               if (keynullness[i] == -1)
                ~~~~~~~~~~~~~~ ^  ~~
 
partition.c:1932:25: warning: comparison of constant -1 with
expression of type 'NullTestType'     (aka 'enum NullTestType') is always false
[-Wtautological-constant-out-of-range-compare]                                       if (keynullness[i] == -1)
                                ~~~~~~~~~~~~~~ ^  ~~
 
2 warnings generated.


Comment for 0004 patch:
270 +   /* -1 represents an invalid value of NullTestType. */271 +   memset(keynullness, -1, PARTITION_MAX_KEYS *
sizeof(NullTestType));

I think we should not use memset to set a value other than 0 or true/false.
This will work for -1 on the system where values are stored in the 2's
complement but I am afraid of other architecture.

Regards,
Amul


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