p1: data types with typalign=c

[NikolayS]

create table x(a "char", b int8, c "char");

– for this table report a1 (new, from branch "alignment") gives:

 Table | Table Size | Bytes Wasted in a Row |      Wasted
-------+------------+-----------------------+------------------
 x     | 536 kB     |                       |
(3 rows)

The alignment padding here is 14 bytes, but it isn't shown.

insert into x select ' ', -2, ' ' from generate_series(1, 10000);
select get_raw_page('x',0);
...2000000000000000feffffffffffffff2000000000000000

Todo:

• [x] deal with data types with typealign=c
• [x] CI tests

(reported by S B over telegram channel)

[NikolayS]

done, committed to alignment branch

supports "char" (aka bpchar), char(N)

not yet supported/checked:

• varchar and varlena in general
• TOASTed values

[NikolayS]

merged to master