[Tile-serving] [openstreetmap/osm2pgsql] Change of index names (#912)

[tb]

[...]
> So where does the actual name come from?
> Some sort of default behaviour?
> Is this documented anywhere?

It's a postgresql default behaviour documented in their docs:

https://www.postgresql.org/docs/11/sql-createindex.html


> Is it dynamic, can it change depending on the version of the Postgres DB for example?

if you check the history of the documentation you'll see the first appearance for an optional name argument in v9.0, and the doc didn't changed since then. But the meaning of "If the name is omitted, PostgreSQL chooses a suitable name based on the parent table's name and the indexed column name(s)." might change over time ;)

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