remote execution fails when there are no hasura columns in the remote relationship

[tirumaraiselvan]

For e.g. suppose we create a relationship with only static values, then no remote query is generated. If we add a hasura column in the API (but not use it in the join), then it works.

This is because of the function peelRemoteKeys here:

graphql-engine/server/src-lib/Hasura/GraphQL/Execute/RemoteJoins.hs

Line 594 in 3c6ffad

(neededHasuraFields (rrRemoteField remoteRelField))

neededHasuraFields is actually an empty array and this is used here for creating a Batch:

graphql-engine/server/src-lib/Hasura/GraphQL/Execute/RemoteJoins.hs

Line 585 in 3c6ffad

(fmap peelRemoteKeys keyedRemotes)