graphql-engine/server/src-lib/Hasura/Backends/Postgres
Antoine Leblanc 512a4dbb92 Use a different reader context for sources and remote schemas with new SchemaT monad.
### Description

This PR changes all the schema code to operate in a specific `SchemaT` monad, rather than in an arbitrary `m` monad. `SchemaT` is intended to be used opaquely with `runSourceSchema` and `runRemoteSchema`. The main goal of this is to allow a different reader context per part of the schema: this PR also minimizes the contexts. This means that we no longer require `SchemaOptions` when building remote schemas' schema, and this PR therefore removes a lot of dummy / placeholder values accordingly.

### Performance and stacking

This PR has been through several iterations. #5339 was the original version, that accomplished the same thing by stacking readers on top of the stack at every remote relationship boundary. This raised performance concerns, and @0x777 confirmed with an ad-hoc test that in some extreme cases we could see up to a 10% performance impact. This version, while more verbose, allows us to unstack / re-stack the readers, and avoid that problem. #5517 adds a new benchmark set to be able to automatically measure this on every PR.

### Remaining work

- [x] a comment (or perhaps even a Note?) should be added to `SchemaT`
- [x] we probably want for #5517 to be merged first so that we can confirm the lack of performance penalty

PR-URL: https://github.com/hasura/graphql-engine-mono/pull/5458
GitOrigin-RevId: e06b83d90da475f745b838f1fd8f8b4d9d3f4b10
2022-09-06 16:49:23 +00:00
..
Connection server: polymorphic codec for metadata sources 2022-08-25 18:36:02 +00:00
DDL Let the same SQL function serve as both a computed field and as a root field (fixes hasura/graphql-engine#8643) 2022-08-30 15:00:45 +00:00
Execute server: skip SOH header in FromCol EncJSON instance 2022-09-05 15:04:32 +00:00
Instances Use a different reader context for sources and remote schemas with new SchemaT monad. 2022-09-06 16:49:23 +00:00
Schema Use a different reader context for sources and remote schemas with new SchemaT monad. 2022-09-06 16:49:23 +00:00
SQL server/postgres: fix string literals in arrays 2022-08-26 09:42:26 +00:00
Translate refactor: Enable Aggregation Predicates IR for Postgres 2022-08-24 12:00:11 +00:00
Types Simplify instance boilerplate 2022-08-11 16:32:41 +00:00
Connection.hs server: split the Postgres Connection module 2022-03-09 07:15:17 +00:00
DDL.hs Evie/postgres/module docs 2022-02-08 09:25:35 +00:00