Horton

Re: Hash Functions

Thomas Munro <thomas.munro@enterprisedb.com>

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From: Thomas Munro <thomas.munro@enterprisedb.com>
To: Greg Stark <stark@mit.edu>
Cc: Robert Haas <robertmhaas@gmail.com>, Amit Kapila <amit.kapila16@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>, Andres Freund <andres@anarazel.de>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>, Jeff Davis <pgsql@j-davis.com>, Yugo Nagata <nagata@sraoss.co.jp>, amul sul <sulamul@gmail.com>
Date: 2017-05-14T22:41:14Z
Lists: pgsql-hackers 
On Mon, May 15, 2017 at 10:08 AM, Thomas Munro
<thomas.munro@enterprisedb.com> wrote:
> [2] https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.1.0/com.ibm.zos.v2r1.cbcux01/flotcop.htm#flotcop

Though looking more closely I see that the default is IEEE in 64 bit
builds, which seems like a good way to kill the older format off.
If/when someone gets PostgreSQL ported to z/OS it probably won't be
because they want to run it on an ancient 32 bit mainframe.

-- 
Thomas Munro
http://www.enterprisedb.com

Commits

  1. Introduce 64-bit hash functions with a 64-bit seed.

  2. Create a "sort support" interface API for faster sorting.

  3. Add seven kanji characters defined in the Windows 950 codepage to our