Waiting for PostgreSQL 10 – Support \if … \elif … \else … \endif in psql scripting.

On 30th of March 2017, Tom Lane committed patch:

Support \if ... \elif ... \else ... \endif in psql scripting.
 
This patch adds nestable conditional blocks to psql.  The control
structure feature per se is complete, but the boolean expressions
understood by \if and \elif are pretty primitive; basically, after
variable substitution and backtick expansion, the result has to be
"true" or "false" or one of the other standard spellings of a boolean
value.  But that's enough for many purposes, since you can always
do the heavy lifting on the server side; and we can extend it later.
 
Along the way, pay down some of the technical debt that had built up
around psql/command.c:
* Refactor exec_command() into a function per command, instead of
being a 1500-line monstrosity.  This makes the file noticeably longer
because of repetitive function header/trailer overhead, but it seems
much more readable.
* Teach psql_get_variable() and psqlscanslash.l to suppress variable
substitution and backtick expansion on the basis of the conditional
stack state, thereby allowing removal of the OT_NO_EVAL kluge.
* Fix the no-doubt-once-expedient hack of sometimes silently substituting
mainloop.c's previous_buf for query_buf when calling HandleSlashCmds.
(It's a bit remarkable that commands like \r worked at all with that.)
Recall of a previous query is now done explicitly in the slash commands
where that should happen.
 
Corey Huinker, reviewed by Fabien Coelho, further hacking by me
 
Discussion: https://postgr.es/m/CADkLM=c94OSRTnat=LX0ivNq4pxDNeoomFfYvBKM5N_xfmLtAA@mail.gmail.com

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Waiting for 8.5 – conditional triggers

On 20th of November Tom Lane committed patch by Takahiro Itagaki which adds interesting functionality:

ADD a WHEN clause TO CREATE TRIGGER, allowing a BOOLEAN expression TO be
checked TO determine whether the TRIGGER should be fired.
 
FOR BEFORE triggers this IS mostly a matter OF spec compliance; but FOR AFTER
triggers it can provide a noticeable performance improvement, since queuing OF
a deferred TRIGGER event AND re-fetching OF the ROW(s) at END OF statement can
be short-circuited IF the TRIGGER does NOT need TO be fired.
 
Takahiro Itagaki, reviewed BY KaiGai Kohei.

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