[sqlite3] optimise user-defined functions

[erlend-aasland]

BPO	46874
Nosy	@corona10, @erlend-aasland
PRs	bpo-46874: Speed up sqlite3 user-defined aggregate 'step' method #31604

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/erlend-aasland'
closed_at = <Date 2022-03-03.13:56:27.944>
created_at = <Date 2022-02-27.13:40:10.527>
labels = ['library', '3.11']
title = '[sqlite3] optimise user-defined functions'
updated_at = <Date 2022-03-03.13:56:27.943>
user = 'https://github.com/erlend-aasland'

bugs.python.org fields:

activity = <Date 2022-03-03.13:56:27.943>
actor = 'erlendaasland'
assignee = 'erlendaasland'
closed = True
closed_date = <Date 2022-03-03.13:56:27.944>
closer = 'erlendaasland'
components = ['Library (Lib)']
creation = <Date 2022-02-27.13:40:10.527>
creator = 'erlendaasland'
dependencies = []
files = []
hgrepos = []
issue_num = 46874
keywords = ['patch']
message_count = 2.0
messages = ['414151', '414440']
nosy_count = 2.0
nosy_names = ['corona10', 'erlendaasland']
pr_nums = ['31604']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue46874'
versions = ['Python 3.11']

[erlend-aasland]

Currently, the step method of user-defined functions is looked up using PyObject_GetAttrString. Using an interned string and PyObject_GetAttr, we can speed up this a little bit.

[corona10]

New changeset 88567a9 by Erlend Egeberg Aasland in branch 'main':
bpo-46874: Speed up sqlite3 user-defined aggregate 'step' method (GH-31604)
88567a9