Repository navigation
ADT identifiers can be truncated #366
Description
Using deeply nested ADTs or types with long names can cause postgres to truncate them, emitting warnings like:
NOTICE: identifier "SomeReallyLongIdentifier/etc" will be truncated to "SomeReallyLongIden"
The truncation length is adjustable, defaulting to 63 bytes, and described here https://www.postgresql.org/docs/current/sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS.
Relevant example in the rel8 docs: https://hackage.haskell.org/package/rel8-1.6.0.0/docs/Rel8.html#g:19
Ideally this wouldn't happen (rel8 avoids generating very long identifiers) but at least it should be called out in the docs.
Reacted by Teo Camarasu
Activity
jy14898 commentedon May 6, 2025
It seems the latest version of rel8 is doing truncation itself (so the warning is silenced):
rel8/src/Rel8/Statement.hs
Line 199 in 688044a
But it still seems likely that field names collide. A simple 'fix' would be to make it so the suffix is a prefix, as that's the freshly generated unique name?parsed the expression wrong, this indeed fixes the issue!TeofilC commentedon May 8, 2025
A documentation PR would be appreciated if someone has capacity