Speed up fetching metarecord attributes for staff catalog and Staff View

[Galen Charlton]

This is a follow-up for bug 2051708.

Among other things, the method open-ils.search.biblio.record.catalog_summary.staff fetches and summarizes the record attributes of all of the other members of the metarecord that the bib(s) passed to it belong to. At the moment, this is done to support the part of Staff View in the staff catalog that counts records in the metarecord by icon format and language.

However, even with the improvements in bug 2051708, the metarecord attribute parsing adds a good 1-3 seconds for search results processing or Staff View display if one or more of the bibs being summarized is part of a metarecord set that has more than 100 members.

Some potential ways to improve performance include:

- Summarizing only the attributes that are actually needed for displays
- Not fetching metarecord member attributes when invoking open-ils.search.biblio.record.catalog_summary.staff when displaying search results. On the one hand, those metarecord member attributes are not currently used in search results display. On the other hand, I can envision future enhancements where you might want them to add links to related records in the metarecord.
- Writing a stored procedure to more efficiently summarize the attributes for the members of a metarecord
- Improving the algorithm used to produce the summary

Evergreen 3.11+

[Galen Charlton (gmc)]

A WIP patch to speed this up can be found the branch working/collab/gmcharlt/lp2051726_speed_up_attr_fetch