Hi, four years ago Marko Tiikkaja send a patch for numeric_trim functions. This functions removed ending zeroes from numeric value. This is useful feature, but there was not any progress on this patch. I think so this feature can be interesting, so I would to revitalize this patch.
Original discussion https://www.postgresql-archive.org/Add-numeric-trim-numeric-td5874444.html Based on this discussion I would to implement three functions - prototype implementation is in plpsql and sql - final implementation will be in C. -- returns minimal scale when the rounding the value to this scale doesn't -- lost any informations. CREATE OR REPLACE FUNCTION pg_catalog.minscale(numeric) RETURNS integer LANGUAGE plpgsql AS $function$ begin for i in 0..256 loop if round($1, i) = $1 then return i; end if; end loop; end; $function$ -- trailing zeroes from end -- trimming only zero for numeric type has sense CREATE OR REPLACE FUNCTION pg_catalog.rtrim(numeric) RETURNS numeric AS $$ SELECT round($1, pg_catalog.minscale($1)) $$ LANGUAGE sql; -- this is due support trim function CREATE OR REPLACE FUNCTION pg_catalog.btrim(numeric) RETURNS numeric AS $$ SELECT pg_catalog.rtrim($1) $$ LANGUAGE sql; postgres=# select trim(10.22000); ┌───────┐ │ btrim │ ╞═══════╡ │ 10.22 │ └───────┘ (1 row) postgres=# select rtrim(10.34900); ┌────────┐ │ rtrim │ ╞════════╡ │ 10.349 │ └────────┘ (1 row) What do you think about it? Regards Pavel
