Feature #14573

Updated by Tom Clegg almost 3 years ago

See #13752, #14560 for previous attempts.
* Indexing on text fields cannot handle medium-size text inputs.
* Indexing on to_tsvector(...) cannot handle certain large text inputs (limit depends on content, not just size). Result: crash when creating the index or when inserting a row, whichever happens last.

Approaches that have been considered: Possible approach:
* Add a tsvector column. Populate it with to_tsvector(...) where possible. Where not possible, either populate with partial content (to_tsvector(substring(...))), or leave it null and adjust the search query to do an unindexed fulltext search on such rows. A function with an "exception clause":https://www.postgresql.org/docs/9.6/plpgsql-control-structures.html#PLPGSQL-ERROR-TRAPPING might work.
* Use something other than Postgresql for text search.
* [[Index of files in collections]]

*Spike goal: validate that the [[Index of files in collections]] approach can return the desired results, and performs well on a production-size database.*

Suggested implementation:
* Retrieve all collections from a production-size cluster, extract the pdh/dir/file/size info, and insert into a table on a dev database.
* Try various ways of indexing/reformatting the dir/filenames so the example searches run quickly and return useful results.
* Provide table of speeds/results for various approaches.

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