Thanks for clarifying, Tomas.
Yes - it appears Google Cloud SQL automatically updates minor versions of
Postgres but hasn't updated beyond 13.1 yet.
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Sent from: https://www.postgresql-archive.org/PostgreSQL-hackers-f1928748.html
Just a bump to see if there is a time frame for a fix on this.
Google Cloud doesn't yet support setting the *enable_incremental_sort * flag
yet.
Was able to temporarily resolve by running the following though:
ALTER DATABASE corpdb SET enable_incremental_sort TO OFF;
Hope this helps others until