Error is raised when `first` or `last` argument is negative

[marijnvanwezel]

When the first or last argument of a connection field is negative, an error is raised. This only seems to happen when first or last is -2 or lower (surprisingly not when it is -1).

Steps to reproduce

Execute a query where the first or last argument of a connection field is -2 or lower.

Expected result

The query is not executed, and a proper error is returned.

Actual result

A Postgrex error is raised:

# Postgrex.Error at POST /graphiql

Exception:

    ** (Postgrex.Error) ERROR 2201W (invalid_row_count_in_limit_clause) LIMIT must not be negative
        (ecto_sql 3.12.1) lib/ecto/adapters/sql.ex:1096: Ecto.Adapters.SQL.raise_sql_call_error/1
        (ecto_sql 3.12.1) lib/ecto/adapters/sql.ex:994: Ecto.Adapters.SQL.execute/6
        (ecto 3.12.5) lib/ecto/repo/queryable.ex:232: Ecto.Repo.Queryable.execute/4
        (ecto 3.12.5) lib/ecto/repo/queryable.ex:19: Ecto.Repo.Queryable.all/3
        (absinthe_relay 1.5.2) lib/absinthe/relay/connection.ex:462: Absinthe.Relay.Connection.from_query/4
        (absinthe 1.7.8) lib/absinthe/resolution.ex:206: Absinthe.Resolution.call/2
        (absinthe 1.7.8) lib/absinthe/phase/document/execution/resolution.ex:234: Absinthe.Phase.Document.Execution.Resolution.reduce_resolution/1
        (absinthe 1.7.8) lib/absinthe/phase/document/execution/resolution.ex:189: Absinthe.Phase.Document.Execution.Resolution.do_resolve_field/3
        (absinthe 1.7.8) lib/absinthe/phase/document/execution/resolution.ex:174: Absinthe.Phase.Document.Execution.Resolution.do_resolve_fields/6
        (absinthe 1.7.8) lib/absinthe/phase/document/execution/resolution.ex:145: Absinthe.Phase.Document.Execution.Resolution.resolve_fields/4
        (absinthe 1.7.8) lib/absinthe/phase/document/execution/resolution.ex:88: Absinthe.Phase.Document.Execution.Resolution.walk_result/5
        (absinthe 1.7.8) lib/absinthe/phase/document/execution/resolution.ex:284: Absinthe.Phase.Document.Execution.Resolution.build_result/3
        (absinthe 1.7.8) lib/absinthe/phase/document/execution/resolution.ex:174: Absinthe.Phase.Document.Execution.Resolution.do_resolve_fields/6
        (absinthe 1.7.8) lib/absinthe/phase/document/execution/resolution.ex:145: Absinthe.Phase.Document.Execution.Resolution.resolve_fields/4
        (absinthe 1.7.8) lib/absinthe/phase/document/execution/resolution.ex:88: Absinthe.Phase.Document.Execution.Resolution.walk_result/5
        (absinthe 1.7.8) lib/absinthe/phase/document/execution/resolution.ex:67: Absinthe.Phase.Document.Execution.Resolution.perform_resolution/3
        (absinthe 1.7.8) lib/absinthe/phase/document/execution/resolution.ex:24: Absinthe.Phase.Document.Execution.Resolution.resolve_current/3
        (absinthe 1.7.8) lib/absinthe/pipeline.ex:408: Absinthe.Pipeline.run_phase/3
        (absinthe_plug 1.5.8) lib/absinthe/plug.ex:536: Absinthe.Plug.run_query/4
        (absinthe_plug 1.5.8) lib/absinthe/plug.ex:290: Absinthe.Plug.call/2