Horton

Re: [HACKERS] [PATCH] Generic type subscripting

Dmitry Dolgov <9erthalion6@gmail.com>

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From: Dmitry Dolgov <9erthalion6@gmail.com>
To: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Pavel Stehule <pavel.stehule@gmail.com>, Thomas Munro <thomas.munro@enterprisedb.com>, Oleksandr Shulgin <oleksandr.shulgin@zalando.de>, Artur Zakirov <a.zakirov@postgrespro.ru>, Tom Lane <tgl@sss.pgh.pa.us>, Robert Haas <robertmhaas@gmail.com>, Andres Freund <andres@anarazel.de>, Michael Paquier <michael.paquier@gmail.com>, Oleg Bartunov <obartunov@gmail.com>, Peter Eisentraut <peter.eisentraut@2ndquadrant.com>, David Steele <david@pgmasters.net>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2019-05-29T15:49:21Z
Lists: pgsql-hackers

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Rebase after pg_indent. Besides, off the list there was a suggestion that this
could be useful to accept more than one data type as a key for subscripting.
E.g. for jsonb it probably makes sense to understand both a simple key name and
jsonpath:

    jsonb['a'] and jsonb['$.a']

While to implement it can be technically relatively straightforward I guess, I
wonder if there is any opinion about how valuable it could be and what it
should looks like from the syntax point of view (since I believe a user needs
to specify which type needs to be used).

Commits

  1. Throw error when assigning jsonb scalar instead of a composite object

  2. Filling array gaps during jsonb subscripting

  3. Implementation of subscripting for jsonb

  4. Allow ALTER TYPE to update an existing type's typsubscript value.

  5. Allow subscripting of hstore values.

  6. Support subscripting of arbitrary types, not only arrays.

  7. jit: Reference function pointer types via llvmjit_types.c.

  8. Teach contain_leaked_vars that assignment SubscriptingRefs are leaky.

  9. jit: Correct parameter type for generated expression evaluation functions.

  10. Renaming for new subscripting mechanism

  11. Fix assertion failure for SSL connections.

  12. Teach eval_const_expressions() to handle some more cases.