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Relay currently only knows how to handle these three types of root fields:

Root field with no arguments and queries a single node.
e.g. empire queries {id: "123", ...}
Root field with one argument and queries a single node.
e.g. ship(id: "456") queries {id: "456", ...}
Root field with one array argument and queries an array of nodes.
e.g. ships(ids: ["456", "789"]) queries [{id: "456", ...}, {id: "789", ...}]
However, it has become clear that Relay needs to support any kind of root field. For example:

Root field with multiple arguments.
Root field with no arguments and queries an array of nodes.
Root field that is a connection.

The issue names no files or tests. Start by locating Relay's handling of root fields and compare the existing single-node and array cases with the requested multiple-argument, array-returning, and connection cases; done means all listed root-field shapes are supported.

Written by the indexing model from the issue text.