I don't know if this is a bug, or a surprising feature, or just a
misunderstanding.
If I specify an explicit collation which happens to be the same as the
default collation, it is not recognized as being the same as the
default.
select version();
version
---------------------------------------------------------------------------------------------------------------
PostgreSQL 9.4.5 on x86_64-unknown-linux-gnu, compiled by gcc (GCC)
4.4.7 20120313 (Red Hat 4.4.7-16), 64-bit
(But also in at least 9.5rc1 and 9.6dev)
create database test2 encoding='utf8' lc_collate='en_US.utf8'
template=template0;
\c test2
create table foo as select generate_series::text as bar from
generate_series(1,100000);
create index on foo (bar );
cluster foo USING foo_bar_idx ;
set enable_sort TO off;
explain select * from foo order by bar;
<walks the index>
explain select * from foo order by bar collate "en_US.utf8";
<does the sort>
Am I the only one surprised by this?
Cheers,
Jeff
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