Re: TupleTableSlot abstraction

Hi,

On 2018-09-04 18:35:34 +0530, Amit Khandekar wrote:
> Subject: [PATCH 05/14] Use tts_flags instead of previous bool members
> 
> Pack the boolean members in TupleTableSlot into a 16 bit tts_flags.
> This reduces the size of TupleTableSlot since each bool member takes
> at least a byte on the platforms where bool is defined as a char.
> 
> Ashutosh Bapat and Andres Freund

> +
> +/* true = slot is empty */
> +#define            TTS_ISEMPTY            (1 << 1)
> +#define IS_TTS_EMPTY(slot)    ((slot)->tts_flags & TTS_ISEMPTY)
> +#define SET_TTS_EMPTY(slot) ((slot)->tts_flags |= TTS_ISEMPTY)
> +#define RESET_TTS_EMPTY(slot) ((slot)->tts_flags &= ~TTS_ISEMPTY)

The flag stuff is the right way, but I'm a bit dubious about the
accessor functions.  I can see open-coding the accesses, using the
macros, or potentially going towards using bitfields.

Any comments?

- Andres