Waiting for PostgreSQL 14 – Allow subscripting of hstore values.

On 11st of December 2020, Tom Lane committed patch:

Allow subscripting of hstore values.
 
This is basically a finger exercise to prove that it's possible for
an extension module to add subscripting ability.  Subscripted fetch
from an hstore is not different from the existing "hstore -> text"
operator.  Subscripted update does seem to be a little easier to
use than the traditional update method using hstore concatenation,
but it's not a fundamentally new ability.
 
However, there may be some value in the code as sample code, since
it shows what's basically the minimum-complexity way to implement
subscripting when one needn't consider nested container objects.
 
Discussion: https://postgr.es/m/3724341.1607551174@sss.pgh.pa.us

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Waiting for 9.5 – Add transforms feature

On 26th of April, Peter Eisentraut committed patch:

Add transforms feature
 
This provides a mechanism for specifying conversions between SQL data
types and procedural languages.  As examples, there are transforms
for hstore and ltree for PL/Perl and PL/Python.
 
reviews by Pavel Stěhule and Andres Freund

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Waiting for 9.3 – JSON generation improvements.

On 10th of March, Andrew Dunstan committed patch:

JSON generation improvements.
 
This adds the following:
 
    json_agg(anyrecord) -> json
    to_json(any) -> json
    hstore_to_json(hstore) -> json (also used as a cast)
    hstore_to_json_loose(hstore) -> json
 
The last provides heuristic treatment of numbers and booleans.
 
Also, in json generation, if any non-builtin type has a cast to json,
that function is used instead of the type's output function.
 
Andrew Dunstan, reviewed by Steve Singer.
 
Catalog version bumped.

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Waiting for 8.5 – changes in hstore

Andrew Gierth (RhodiumToad on irc) wrote, and Tom Lane committed:

Assorted improvements in contrib/hstore.
 
Remove the 64K limit on the lengths of keys and values within an hstore.
(This changes the on-disk format, but the old format can still be read.)
Add support for btree/hash opclasses for hstore --- this is not so much
for actual indexing purposes as to allow use of GROUP BY, DISTINCT, etc.
Add various other new functions and operators.
 
Andrew Gierth

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