Thread: Amazon Redshift
<div style="font-family: Verdana;font-size: 12.0px;"><div><div>Hackers,<br /> <br /> do you think we should implement someof the functions offered by Amazon Redshift?</div><div> </div><div>http://docs.aws.amazon.com/redshift/latest/dg/c_SQL_functions.html</div><div> </div><div>Amazon Redshiftis completely based on PostgreSQL, but they have implemented some features not currently available in PostgreSQL.<br/> Given the fact that it's a successful customer-driven commercial project, one can easily guess that thefunctions they implemented are useful and requested by many users.</div><div> </div><div>Phil</div></div></div>
philip taylor <philtay51@mail.com> wrote: > do you think we should implement some of the functions offered by > Amazon Redshift? > > http://docs.aws.amazon.com/redshift/latest/dg/c_SQL_functions.html Well, obviously we already have many of the functions linked from that page. I think that if you want to go through them and pick out a few that you think are particularly promising it could start a useful discussion. Pointing at a page that includes such things as CURRENT_DATE, the avg() aggregate, and the lead() window function is just going to waste the time of everyone who follows the link. It's not like all of them would be committed in the same patch anyway. -- Kevin Grittner EDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company
On 11/5/14, 3:42 PM, Kevin Grittner wrote: > philip taylor <philtay51@mail.com> wrote: > >> do you think we should implement some of the functions offered by >> Amazon Redshift? >> >> http://docs.aws.amazon.com/redshift/latest/dg/c_SQL_functions.html > > Well, obviously we already have many of the functions linked from > that page. I think that if you want to go through them and pick > out a few that you think are particularly promising it could start > a useful discussion. Pointing at a page that includes such things > as CURRENT_DATE, the avg() aggregate, and the lead() window > function is just going to waste the time of everyone who follows > the link. It's not like all of them would be committed in the same > patch anyway. At the risk stating the obvious, before we look at implementing them we should see if Amazon would donate that effort. But as Kevin said, first step is discussion on what we don't have and whether we want it. -- Jim Nasby, Data Architect, Blue Treble Consulting Data in Trouble? Get it in Treble! http://BlueTreble.com
>>> do you think we should implement some of the functions offered by >>> Amazon Redshift? >>> >>> http://docs.aws.amazon.com/redshift/latest/dg/c_SQL_functions.html >> >> Well, obviously we already have many of the functions linked from >> that page. I think that if you want to go through them and pick >> out a few that you think are particularly promising it could start >> a useful discussion. Pointing at a page that includes such things >> as CURRENT_DATE, the avg() aggregate, and the lead() window >> function is just going to waste the time of everyone who follows >> the link. It's not like all of them would be committed in the same >> patch anyway. > > At the risk stating the obvious, before we look at implementing them we should see if Amazon would donate that effort. > > But as Kevin said, first step is discussion on what we don't have and whether we want it. Ok, this is a summary of what they have that we don't (of course, I could have missed something): Date Functions http://docs.aws.amazon.com/redshift/latest/dg/r_ADD_MONTHS.html http://docs.aws.amazon.com/redshift/latest/dg/r_DATEADD_function.html http://docs.aws.amazon.com/redshift/latest/dg/r_DATEDIFF_function.html http://docs.aws.amazon.com/redshift/latest/dg/r_LAST_DAY.html http://docs.aws.amazon.com/redshift/latest/dg/r_MONTHS_BETWEEN_function.html http://docs.aws.amazon.com/redshift/latest/dg/r_NEXT_DAY.html String Functions http://docs.aws.amazon.com/redshift/latest/dg/REGEXP_COUNT.html http://docs.aws.amazon.com/redshift/latest/dg/REGEXP_INSTR.html http://docs.aws.amazon.com/redshift/latest/dg/r_STRTOL.html http://docs.aws.amazon.com/redshift/latest/dg/crc32-function.html http://docs.aws.amazon.com/redshift/latest/dg/FUNC_SHA1.html JSON Functions http://docs.aws.amazon.com/redshift/latest/dg/JSON_ARRAY_LENGTH.html http://docs.aws.amazon.com/redshift/latest/dg/JSON_EXTRACT_ARRAY_ELEMENT_TEXT.html http://docs.aws.amazon.com/redshift/latest/dg/JSON_EXTRACT_PATH_TEXT.html Window functions http://docs.aws.amazon.com/redshift/latest/dg/r_WF_RATIO_TO_REPORT.html http://docs.aws.amazon.com/redshift/latest/dg/r_WF_MEDIAN.html
On 11/05/2014 02:36 PM, philip taylor wrote: > Ok, this is a summary of what they have that we don't (of course, I could have missed something): > I can't see any functions on that list I'd want. For example, DATEADD is there just to be compatible with MSSQL. It's useless to us. -- Josh Berkus PostgreSQL Experts Inc. http://pgexperts.com
On Wed, Nov 5, 2014 at 5:36 PM, philip taylor <philtay51@mail.com> wrote: >>>> do you think we should implement some of the functions offered by >>>> Amazon Redshift? >>>> >>>> http://docs.aws.amazon.com/redshift/latest/dg/c_SQL_functions.html >>> > > JSON Functions > > http://docs.aws.amazon.com/redshift/latest/dg/JSON_ARRAY_LENGTH.html > http://docs.aws.amazon.com/redshift/latest/dg/JSON_EXTRACT_PATH_TEXT.html > We actually have the two above: http://www.postgresql.org/docs/current/static/functions-json.html Actually, if you look at the examples you will see they only copy ours and changed the values a little. -- Jaime Casanova www.2ndQuadrant.com Professional PostgreSQL: Soporte 24x7 y capacitación Phone: +593 4 5107566 Cell: +593 987171157
On 11/05/2014 11:36 PM, philip taylor wrote:> String Functions>> http://docs.aws.amazon.com/redshift/latest/dg/FUNC_SHA1.html http://www.postgresql.org/docs/9.3/static/pgcrypto.html (not really a string function imho)
--On 5. November 2014 23:36:03 +0100 philip taylor <philtay51@mail.com> wrote: > Date Functions > > http://docs.aws.amazon.com/redshift/latest/dg/r_ADD_MONTHS.html > http://docs.aws.amazon.com/redshift/latest/dg/r_DATEADD_function.html > http://docs.aws.amazon.com/redshift/latest/dg/r_DATEDIFF_function.html > http://docs.aws.amazon.com/redshift/latest/dg/r_LAST_DAY.html > http://docs.aws.amazon.com/redshift/latest/dg/r_MONTHS_BETWEEN_function.h > tml http://docs.aws.amazon.com/redshift/latest/dg/r_NEXT_DAY.html fyi, except DATE_DIFF() all of these functions can be installed by using the orafce extension i believe. -- Thanks Bernd