Re: Press Release Draft - 2016-02-09 Cumulative Update

Am 07.02.2017 um 18:44 schrieb Alvaro Herrera <alvherre@2ndquadrant.com>:
>  80     CREATE INDEX CONCURRENTLY bad_index_name ON table_name (column_name); /* replace names with your original index definition */

I was thinking if we could replace that "replace names with your original index definition" with something more fancy using pg_get_indexdef in that recipe. I ended up with quite a "REINDEX CONCURRENTLY" monster:

\set index_name 'my_bad_index' 
\set table_schema 'public'
SELECT :'index_name'||'_'||left(md5(random()::text), 5) AS index_name_tmp \gset
SELECT replace(replace(pg_get_indexdef((quote_ident(:'table_schema')||'.'||quote_ident(:'index_name'))::regclass), 'INDEX '||quote_ident(:'index_name'), 'INDEX '||quote_ident(:'index_name_tmp')), 'CREATE INDEX', 'CREATE INDEX CONCURRENTLY') \gexec
DROP INDEX CONCURRENTLY :"table_schema".:"index_name";
ALTER INDEX :"table_schema".:"index_name_tmp" RENAME TO :"index_name";

Probably not useable as a recipe in such an announcement but it was fun to build and to see what is actually possible with some psql magic :)

Tobias