Re: Since '2001-09-09 01:46:40'::timestamp microseconds are lost when extracting epoch

David Steele <david@pgmasters.net>

From: David Steele <david@pgmasters.net>

To: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>, Tom Lane <tgl@sss.pgh.pa.us>

Cc: Pavel Stehule <pavel.stehule@gmail.com>, Thomas Munro <thomas.munro@gmail.com>, Petr Fedorov <petr.fedorov@phystech.edu>, pgsql-hackers <pgsql-hackers@postgresql.org>

Date: 2021-03-15T12:18:29Z

Lists: pgsql-bugs, pgsql-hackers

On 12/15/20 9:03 AM, Peter Eisentraut wrote:
> Here is a new patch for this.  This now follows the implementation that 
> Tom has suggested:  Leave date_part() alone, add a new set of extract() 
> functions, and map the SQL EXTRACT construct to those.  I have basically 
> just copied over the implementations from my previous patch and placed 
> them next to the existing date_part() implementations.  So all the 
> behavior is still the same as in the previous patches.
> 
> One thing I still need to look into is how to not lose all the test 
> coverage for date_part().  But that should be fairly mechanical, so I'm 
> leaving it off in this version.

Tom, what do you think of the updated patch?

Regards,
-- 
-David
david@pgmasters.net

Commits

Fix inconsistent equalfuncs.c behavior for FuncCall.funcformat.
- a65e9f3f1405 14.0 landed
Doc: fix discussion of how to get real Julian Dates.
- f6171e6843f0 9.6.22 landed
- c93f8f3b8d3b 14.0 landed
- 824df1cccb74 12.7 landed
- 7cd542023056 11.12 landed
- 7bbcfb4d584d 13.3 landed
- 56e234b6aff9 10.17 landed
Doc: document EXTRACT(JULIAN ...), improve Julian Date explanation.
- ec5bab9217cd 13.3 landed
- b391db4943dc 9.6.22 landed
- b230618ce875 12.7 landed
- 79a5928ebcb7 14.0 landed
- 64d617de3c59 10.17 landed
- 4b610547c27a 11.12 landed
Change return type of EXTRACT to numeric
- a2da77cdb466 14.0 landed
Improve our ability to regurgitate SQL-syntax function calls.
- 40c24bfef925 14.0 landed
Add more tests for EXTRACT of date type
- 540612fa469e 14.0 landed
Expose internal function for converting int64 to numeric
- 0aa8f764088e 14.0 landed
Change floating-point output format for improved performance.
- 02ddd499322a 12.0 cited