tanmayrauth commented on code in PR #1494:
URL: https://github.com/apache/iceberg-go/pull/1494#discussion_r3608868751


##########
catalog/rest/scan_planning_fake_test.go:
##########
@@ -0,0 +1,831 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package rest_test
+
+import (
+       "bytes"
+       "context"
+       "encoding/json"
+       "io"
+       "net/http"
+       "testing"
+       "time"
+
+       "github.com/apache/iceberg-go/catalog/rest"
+       "github.com/apache/iceberg-go/catalog/rest/internal/planfake"
+       "github.com/apache/iceberg-go/table"
+       "github.com/google/uuid"
+       "github.com/stretchr/testify/assert"
+       "github.com/stretchr/testify/require"
+)
+
+func TestPlanFakeCapabilityDiscovery(t *testing.T) {
+       t.Parallel()
+
+       tests := []struct {
+               name             string
+               endpoints        []string
+               wantPlan         bool
+               wantFullPlanning bool
+       }{
+               {
+                       name: "all planning endpoints",
+                       endpoints: []string{
+                               planfake.PlanTableScanEndpoint,
+                               planfake.FetchPlanningResultEndpoint,
+                               planfake.CancelPlanningEndpoint,
+                               planfake.FetchScanTasksEndpoint,
+                       },
+                       wantPlan:         true,
+                       wantFullPlanning: true,
+               },
+               {
+                       name:             "plan only",
+                       endpoints:        
[]string{planfake.PlanTableScanEndpoint},
+                       wantPlan:         true,
+                       wantFullPlanning: false,
+               },
+               {
+                       name: "missing plan submission",
+                       endpoints: []string{
+                               planfake.FetchPlanningResultEndpoint,
+                               planfake.CancelPlanningEndpoint,
+                               planfake.FetchScanTasksEndpoint,
+                       },
+                       wantPlan:         false,
+                       wantFullPlanning: false,
+               },
+               {
+                       name: "missing result fetch",
+                       endpoints: []string{
+                               planfake.PlanTableScanEndpoint,
+                               planfake.CancelPlanningEndpoint,
+                               planfake.FetchScanTasksEndpoint,
+                       },
+                       wantPlan:         true,
+                       wantFullPlanning: false,
+               },
+               {
+                       name: "missing cancellation",
+                       endpoints: []string{
+                               planfake.PlanTableScanEndpoint,
+                               planfake.FetchPlanningResultEndpoint,
+                               planfake.FetchScanTasksEndpoint,
+                       },
+                       wantPlan:         true,
+                       wantFullPlanning: false,
+               },
+               {
+                       name: "missing task fetch",
+                       endpoints: []string{
+                               planfake.PlanTableScanEndpoint,
+                               planfake.FetchPlanningResultEndpoint,
+                               planfake.CancelPlanningEndpoint,
+                       },
+                       wantPlan:         true,
+                       wantFullPlanning: false,
+               },
+               {
+                       name:             "no planning endpoints",
+                       endpoints:        []string{"GET 
/v1/{prefix}/namespaces"},
+                       wantPlan:         false,
+                       wantFullPlanning: false,
+               },
+       }
+
+       for _, test := range tests {
+               t.Run(test.name, func(t *testing.T) {
+                       t.Parallel()
+
+                       srv := planfake.New(t, planfake.Scenario{
+                               ConfigResponse: 
planfake.ConfigResponse(test.endpoints...),
+                       })
+                       catalog, err := rest.NewCatalog(t.Context(), "rest", 
srv.URL())
+                       require.NoError(t, err)
+
+                       assert.Equal(t, test.wantPlan, 
catalog.SupportsPlanTableScan())
+                       assert.Equal(t, test.wantFullPlanning, 
catalog.SupportsFullRemoteScanPlanning())
+
+                       requests := srv.Requests()
+                       require.Len(t, requests, 1)
+                       assert.Equal(t, http.MethodGet, requests[0].Method)
+                       assert.Equal(t, "/v1/config", requests[0].Path)
+               })
+       }
+}
+
+func TestPlanFakeSynchronousPlanningCapturesRequest(t *testing.T) {
+       t.Parallel()
+
+       srv := planfake.New(t, planfake.Scenario{
+               ConfigResponse: fullPlanningConfigResponse(),
+               ExpectedTarget: &planfake.ExpectedTarget{
+                       Prefix: "catalog", Namespace: "org\x1fanalytics", 
Table: "events",
+               },
+               PlanResponse: planFakeJSONResponse(canonicalCompletedPlanJSON),
+       })
+       catalog, err := rest.NewCatalog(t.Context(), "rest", srv.URL(), 
rest.WithPrefix("catalog"))
+       require.NoError(t, err)
+
+       idempotencyKey := "0190b6c5-1c3d-7000-8000-000000000011"
+       accessDelegation := "remote-signing"
+       snapshotID := int64(123)
+       minimumRows := int64(50)
+       caseSensitive := false
+       useSnapshotSchema := true
+       response, err := catalog.PlanTableScan(t.Context(), 
table.Identifier{"org", "analytics", "events"}, rest.PlanTableScanRequest{
+               IdempotencyKey:    &idempotencyKey,
+               AccessDelegation:  &accessDelegation,
+               SnapshotID:        &snapshotID,
+               Select:            []string{"id", "payload"},
+               Filter:            
json.RawMessage(`{"type":"eq","term":"id","value":34}`),
+               MinRowsRequested:  &minimumRows,
+               CaseSensitive:     &caseSensitive,
+               UseSnapshotSchema: &useSnapshotSchema,
+               StatsFields:       []string{"id", "payload"},
+       })
+       require.NoError(t, err)
+
+       assert.Equal(t, rest.PlanStatusCompleted, response.Status)
+       require.NotNil(t, response.PlanID)
+       assert.Equal(t, "plan-sync", *response.PlanID)
+       assert.Equal(t, []string{"inline-child"}, response.PlanTasks)
+       assert.Len(t, response.FileScanTasks, 1)
+       assert.Len(t, response.DeleteFiles, 1)
+       require.Len(t, response.StorageCredentials, 1)
+       assert.Equal(t, "s3://warehouse/table/", 
response.StorageCredentials[0].Prefix)
+       assert.Equal(t, "plan-key", 
response.StorageCredentials[0].Config["s3.access-key-id"])
+
+       requests := srv.Requests()
+       require.Len(t, requests, 2)
+       request := requests[1]
+       assert.Equal(t, http.MethodPost, request.Method)
+       assert.Equal(t, 
"/v1/catalog/namespaces/org%1Fanalytics/tables/events/plan", request.Path)
+       assert.Equal(t, "catalog", request.Prefix)
+       assert.Equal(t, "org\x1fanalytics", request.Namespace)
+       assert.Equal(t, "events", request.Table)
+       assert.Equal(t, idempotencyKey, request.Header.Get("Idempotency-Key"))
+       assert.Equal(t, accessDelegation, 
request.Header.Get("X-Iceberg-Access-Delegation"))
+       assert.JSONEq(t, `{
+               "snapshot-id": 123,
+               "select": ["id", "payload"],
+               "filter": {"type": "eq", "term": "id", "value": 34},
+               "min-rows-requested": 50,
+               "case-sensitive": false,
+               "use-snapshot-schema": true,
+               "stats-fields": ["id", "payload"]
+       }`, string(request.Body))
+}
+
+func TestPlanFakeAsynchronousPlanningWaitsThroughRetry(t *testing.T) {
+       t.Parallel()
+
+       srv := planfake.New(t, planfake.Scenario{
+               ConfigResponse: fullPlanningConfigResponse(),
+               ExpectedTarget: standardPlanFakeTarget(),
+               PlanResponse:   
planFakeJSONResponse(`{"status":"submitted","plan-id":"plan-async"}`),
+               PollResponses: map[string]planfake.ResponseSequence{
+                       "plan-async": {
+                               Responses: []planfake.Response{
+                                       {
+                                               Status: 
http.StatusServiceUnavailable,
+                                               Body: json.RawMessage(`{
+                                               
"error":{"message":"busy","type":"ServiceUnavailableException","code":503}
+                                       }`),
+                                       },
+                                       
planFakeJSONResponse(`{"status":"submitted"}`),
+                                       planFakeJSONResponse(`{
+                                       "status":"completed",
+                                       "plan-tasks":["root-task"],
+                                       "storage-credentials":[{
+                                               
"prefix":"s3://warehouse/table/",
+                                               "config":{"token":"async-token"}
+                                               }]
+                               }`),
+                               },
+                       },
+               },
+       })
+       catalog, err := rest.NewCatalog(t.Context(), "rest", srv.URL(), 
rest.WithPrefix("warehouse"))
+       require.NoError(t, err)
+
+       accessDelegation := "remote-signing"
+       initial, err := catalog.PlanTableScan(t.Context(), 
standardPlanFakeIdentifier(), rest.PlanTableScanRequest{
+               AccessDelegation: &accessDelegation,
+       })
+       require.NoError(t, err)
+       require.NotNil(t, initial.PlanID)
+       assert.Equal(t, rest.PlanStatusSubmitted, initial.Status)
+
+       ctx, cancel := context.WithTimeout(t.Context(), 5*time.Second)
+       defer cancel()
+       completed, err := catalog.WaitForPlan(ctx, 
standardPlanFakeIdentifier(), *initial.PlanID, rest.WaitForPlanOptions{
+               MinDelay:          time.Millisecond,
+               MaxDelay:          2 * time.Millisecond,
+               CancelGracePeriod: time.Second,
+               MaxRetries:        10,
+               AccessDelegation:  &accessDelegation,
+       })
+       require.NoError(t, err)
+
+       assert.Equal(t, rest.PlanStatusCompleted, completed.Status)
+       assert.Equal(t, []string{"root-task"}, completed.PlanTasks)
+       require.Len(t, completed.StorageCredentials, 1)
+       assert.Equal(t, "async-token", 
completed.StorageCredentials[0].Config["token"])
+       assert.Equal(t, 3, srv.PollCount("plan-async"))
+       assert.Zero(t, srv.CancelCount("plan-async"))
+
+       requests := srv.Requests()
+       assertPlanFakeUUIDv7Header(t, requests[1])
+       pollRequests := requestsForPlanFakeOperation(requests, http.MethodGet, 
"plan-async", "")
+       require.Len(t, pollRequests, 3)
+       for _, request := range pollRequests {
+               assert.Equal(t, accessDelegation, 
request.Header.Get("X-Iceberg-Access-Delegation"))
+       }
+}
+
+func TestPlanFakeWaitCancellationCleansUpServerPlan(t *testing.T) {
+       t.Parallel()
+
+       srv := planfake.New(t, planfake.Scenario{
+               ConfigResponse: fullPlanningConfigResponse(),
+               ExpectedTarget: standardPlanFakeTarget(),
+               PlanResponse:   
planFakeJSONResponse(`{"status":"submitted","plan-id":"plan-cancel"}`),
+               PollResponses: map[string]planfake.ResponseSequence{
+                       "plan-cancel": {
+                               Responses:  
[]planfake.Response{planFakeJSONResponse(`{"status":"submitted"}`)},
+                               RepeatLast: true,
+                       },
+               },
+               CancelResponses: map[string]planfake.ResponseSequence{
+                       "plan-cancel": {
+                               Responses: []planfake.Response{{Status: 
http.StatusNoContent}},
+                       },
+               },
+       })
+       catalog, err := rest.NewCatalog(t.Context(), "rest", srv.URL(), 
rest.WithPrefix("warehouse"))
+       require.NoError(t, err)
+
+       initial, err := catalog.PlanTableScan(t.Context(), 
standardPlanFakeIdentifier(), rest.PlanTableScanRequest{})
+       require.NoError(t, err)
+       require.NotNil(t, initial.PlanID)
+
+       waitContext, cancelWait := context.WithCancel(t.Context())
+       defer cancelWait()
+       waitDone := make(chan error, 1)
+       go func() {
+               _, waitErr := catalog.WaitForPlan(waitContext, 
standardPlanFakeIdentifier(), *initial.PlanID, rest.WaitForPlanOptions{
+                       MinDelay:          time.Hour,
+                       MaxDelay:          time.Hour,
+                       CancelGracePeriod: time.Second,
+               })
+               waitDone <- waitErr
+       }()
+
+       observeContext, cancelObserve := context.WithTimeout(t.Context(), 
5*time.Second)
+       defer cancelObserve()
+       require.NoError(t, srv.WaitForPollCount(observeContext, "plan-cancel", 
1))
+       cancelWait()
+       err = waitForPlanFakeResult(t, observeContext, waitDone)
+       require.ErrorIs(t, err, context.Canceled)
+       assert.GreaterOrEqual(t, srv.PollCount("plan-cancel"), 1)
+       assert.Equal(t, 1, srv.CancelCount("plan-cancel"))
+       assert.Empty(t, srv.ScenarioErrors())
+
+       requests := requestsForPlanFakeOperation(srv.Requests(), 
http.MethodDelete, "plan-cancel", "")
+       require.Len(t, requests, 1)
+       assert.Empty(t, requests[0].Header.Get("Idempotency-Key"))
+       assert.Empty(t, requests[0].Header.Get("X-Iceberg-Access-Delegation"))
+}
+
+func TestPlanFakeWaitCancellationBoundsStalledCleanup(t *testing.T) {
+       t.Parallel()
+
+       stalledCancel := make(chan struct{})
+       srv := planfake.New(t, planfake.Scenario{
+               ConfigResponse: fullPlanningConfigResponse(),
+               ExpectedTarget: standardPlanFakeTarget(),
+               PlanResponse:   
planFakeJSONResponse(`{"status":"submitted","plan-id":"plan-stalled-cancel"}`),
+               PollResponses: map[string]planfake.ResponseSequence{
+                       "plan-stalled-cancel": {
+                               Responses:  
[]planfake.Response{planFakeJSONResponse(`{"status":"submitted"}`)},
+                               RepeatLast: true,
+                       },
+               },
+               CancelResponses: map[string]planfake.ResponseSequence{
+                       "plan-stalled-cancel": {
+                               Responses: []planfake.Response{{Status: 
http.StatusNoContent, Gate: stalledCancel}},
+                       },
+               },
+       })
+       catalog, err := rest.NewCatalog(t.Context(), "rest", srv.URL(), 
rest.WithPrefix("warehouse"))
+       require.NoError(t, err)
+
+       initial, err := catalog.PlanTableScan(t.Context(), 
standardPlanFakeIdentifier(), rest.PlanTableScanRequest{})
+       require.NoError(t, err)
+       require.NotNil(t, initial.PlanID)
+
+       waitContext, cancelWait := context.WithCancel(t.Context())
+       defer cancelWait()
+       waitDone := make(chan error, 1)
+       go func() {
+               _, waitErr := catalog.WaitForPlan(waitContext, 
standardPlanFakeIdentifier(), *initial.PlanID, rest.WaitForPlanOptions{
+                       MinDelay:          time.Hour,
+                       MaxDelay:          time.Hour,
+                       CancelGracePeriod: 100 * time.Millisecond,
+               })
+               waitDone <- waitErr
+       }()
+
+       observeContext, cancelObserve := context.WithTimeout(t.Context(), 
5*time.Second)
+       defer cancelObserve()
+       require.NoError(t, srv.WaitForPollCount(observeContext, 
"plan-stalled-cancel", 1))
+       cancelWait()
+       err = waitForPlanFakeResult(t, observeContext, waitDone)
+       require.ErrorIs(t, err, context.Canceled)
+       assert.GreaterOrEqual(t, srv.PollCount("plan-stalled-cancel"), 1)
+       assert.Equal(t, 1, srv.CancelCount("plan-stalled-cancel"))
+       assert.Empty(t, srv.ScenarioErrors())
+}
+
+func TestPlanFakeSupportsNestedAndReissuedTaskHandles(t *testing.T) {
+       t.Parallel()
+
+       srv := planfake.New(t, planfake.Scenario{
+               ConfigResponse: fullPlanningConfigResponse(),
+               ExpectedTarget: standardPlanFakeTarget(),
+               TaskResponses: map[string]planfake.ResponseSequence{
+                       "root-task": {
+                               Responses: 
[]planfake.Response{planFakeJSONResponse(`{
+                                       
"plan-tasks":["reissued-task","reissued-task"],
+                                       "file-scan-tasks":[` + 
rootFileScanTaskJSON + `]
+                               }`)},
+                       },
+                       "reissued-task": {
+                               Responses: []planfake.Response{
+                                       
planFakeJSONResponse(`{"plan-tasks":["leaf-a"]}`),
+                                       
planFakeJSONResponse(`{"plan-tasks":["leaf-b"]}`),
+                               },
+                       },
+                       "leaf-a": {
+                               Responses:  
[]planfake.Response{planFakeJSONResponse(envelopeAScanTasksJSON)},
+                               RepeatLast: true,
+                       },
+                       "leaf-b": {
+                               Responses:  
[]planfake.Response{planFakeJSONResponse(envelopeBScanTasksJSON)},
+                               RepeatLast: true,
+                       },
+                       "grandchild": {
+                               Responses: []planfake.Response{
+                                       
planFakeJSONResponse(`{"file-scan-tasks":[` + grandchildFileScanTaskJSON + 
`]}`),
+                               },
+                       },
+               },
+       })
+       catalog, err := rest.NewCatalog(t.Context(), "rest", srv.URL(), 
rest.WithPrefix("warehouse"))
+       require.NoError(t, err)
+
+       queue := []string{"root-task"}
+       responsesByHandle := make(map[string][]rest.FetchScanTasksResponse)
+       for len(queue) > 0 {
+               handle := queue[0]
+               queue = queue[1:]
+
+               response, err := catalog.FetchScanTasks(t.Context(), 
standardPlanFakeIdentifier(), rest.FetchScanTasksRequest{
+                       PlanTask: handle,
+               })
+               require.NoError(t, err)
+               responsesByHandle[handle] = append(responsesByHandle[handle], 
response)
+               queue = append(queue, response.PlanTasks...)
+       }
+
+       assert.Equal(t, 1, srv.TaskCount("root-task"))
+       assert.Equal(t, 2, srv.TaskCount("reissued-task"))
+       assert.Equal(t, 1, srv.TaskCount("leaf-a"))
+       assert.Equal(t, 1, srv.TaskCount("leaf-b"))
+       assert.Equal(t, 1, srv.TaskCount("grandchild"))
+       require.Len(t, responsesByHandle["reissued-task"], 2)
+       assert.Equal(t, []string{"leaf-a"}, 
responsesByHandle["reissued-task"][0].PlanTasks)
+       assert.Equal(t, []string{"leaf-b"}, 
responsesByHandle["reissued-task"][1].PlanTasks)
+
+       // Both independently fetched envelopes use delete reference 0 and bind 
it to
+       // a different delete path. Keeping these raw envelopes separate is 
required
+       // before the decoder turns them into domain tasks.
+       require.Len(t, responsesByHandle["leaf-a"], 1)
+       assert.Len(t, responsesByHandle["leaf-a"][0].FileScanTasks, 1)
+       assert.Len(t, responsesByHandle["leaf-a"][0].DeleteFiles, 1)
+       require.Len(t, responsesByHandle["leaf-b"], 1)
+       assert.Len(t, responsesByHandle["leaf-b"][0].FileScanTasks, 1)
+       assert.Len(t, responsesByHandle["leaf-b"][0].DeleteFiles, 1)
+
+       // Fetch each leaf again as raw JSON through an independent HTTP 
client. This
+       // keeps the fixture assertion independent from production wire types 
and binds
+       // each handle to its own envelope-local delete reference and child 
handles.
+       leafA := fetchRawPlanTaskFixture(t, srv.URL(), "leaf-a")
+       assertEnvelopeLocalFixture(t, leafA, nil,
+               "s3://warehouse/table/envelope-a.parquet",
+               "s3://warehouse/table/envelope-a-delete.parquet")
+       leafB := fetchRawPlanTaskFixture(t, srv.URL(), "leaf-b")
+       assertEnvelopeLocalFixture(t, leafB, []string{"grandchild"},
+               "s3://warehouse/table/envelope-b.parquet",
+               "s3://warehouse/table/envelope-b-delete.parquet")
+       assert.Equal(t, 2, srv.TaskCount("leaf-a"))
+       assert.Equal(t, 2, srv.TaskCount("leaf-b"))
+
+       for _, request := range srv.Requests() {
+               if request.PlanTask == "" {
+                       continue
+               }
+               assertPlanFakeUUIDv7Header(t, request)
+               assert.Empty(t, 
request.Header.Get("X-Iceberg-Access-Delegation"))
+       }
+}
+
+func TestPlanFakeModelsExpiredPlansAndTasks(t *testing.T) {

Review Comment:
   This covers the fetch-result/fetch-tasks 404 mappings but leaves two live 
error paths untested that the fake models trivially:
     
     - status:"failed" → *PlanFailedError (scan_planning.go:230-231, 275-276) 
and a polled status:"cancelled" → ErrPlanCancelled (277-278). A regression that 
dropped the PlanStatusFailed case, wrapped the wrong sentinel, or left 
PlanFailedError.Detail nil would ship green — callers using errors.Is(err, 
rest.ErrPlanFailed) to branch, or errors.As to surface the server's message, 
would silently get an opaque ErrRESTError. Add a PlanResponse of 
{"status":"failed","error":{...}} asserting errors.Is + 
errors.As-recovers-Detail, and a poll sequence ending in {"status":"cancelled"} 
asserting errors.Is(err, rest.ErrPlanCancelled).
     
     - POST /plan 404 error-type mapping. planTableScanErrorTypes 
(scan_planning.go:96-99) maps a plan-submission 404 to 
catalog.ErrNoSuchTable/ErrNoSuchNamespace and is deliberately narrower than the 
fetch maps (no NoSuchPlanIdException). If that map regressed, a plan against a 
dropped table returns the wrong sentinel and a caller's errors.Is(err, 
catalog.ErrNoSuchTable) retry never fires. Add a PlanResponse of {Status:404, 
Body:{"error":{"type":"NoSuchTableException"}}} asserting errors.Is(err, 
catalog.ErrNoSuchTable), plus the namespace variant.



##########
catalog/rest/scan_planning_fake_test.go:
##########
@@ -0,0 +1,831 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package rest_test
+
+import (
+       "bytes"
+       "context"
+       "encoding/json"
+       "io"
+       "net/http"
+       "testing"
+       "time"
+
+       "github.com/apache/iceberg-go/catalog/rest"
+       "github.com/apache/iceberg-go/catalog/rest/internal/planfake"
+       "github.com/apache/iceberg-go/table"
+       "github.com/google/uuid"
+       "github.com/stretchr/testify/assert"
+       "github.com/stretchr/testify/require"
+)
+
+func TestPlanFakeCapabilityDiscovery(t *testing.T) {
+       t.Parallel()
+
+       tests := []struct {
+               name             string
+               endpoints        []string
+               wantPlan         bool
+               wantFullPlanning bool
+       }{
+               {
+                       name: "all planning endpoints",
+                       endpoints: []string{
+                               planfake.PlanTableScanEndpoint,
+                               planfake.FetchPlanningResultEndpoint,
+                               planfake.CancelPlanningEndpoint,
+                               planfake.FetchScanTasksEndpoint,
+                       },
+                       wantPlan:         true,
+                       wantFullPlanning: true,
+               },
+               {
+                       name:             "plan only",
+                       endpoints:        
[]string{planfake.PlanTableScanEndpoint},
+                       wantPlan:         true,
+                       wantFullPlanning: false,
+               },
+               {
+                       name: "missing plan submission",
+                       endpoints: []string{
+                               planfake.FetchPlanningResultEndpoint,
+                               planfake.CancelPlanningEndpoint,
+                               planfake.FetchScanTasksEndpoint,
+                       },
+                       wantPlan:         false,
+                       wantFullPlanning: false,
+               },
+               {
+                       name: "missing result fetch",
+                       endpoints: []string{
+                               planfake.PlanTableScanEndpoint,
+                               planfake.CancelPlanningEndpoint,
+                               planfake.FetchScanTasksEndpoint,
+                       },
+                       wantPlan:         true,
+                       wantFullPlanning: false,
+               },
+               {
+                       name: "missing cancellation",
+                       endpoints: []string{
+                               planfake.PlanTableScanEndpoint,
+                               planfake.FetchPlanningResultEndpoint,
+                               planfake.FetchScanTasksEndpoint,
+                       },
+                       wantPlan:         true,
+                       wantFullPlanning: false,
+               },
+               {
+                       name: "missing task fetch",
+                       endpoints: []string{
+                               planfake.PlanTableScanEndpoint,
+                               planfake.FetchPlanningResultEndpoint,
+                               planfake.CancelPlanningEndpoint,
+                       },
+                       wantPlan:         true,
+                       wantFullPlanning: false,
+               },
+               {
+                       name:             "no planning endpoints",
+                       endpoints:        []string{"GET 
/v1/{prefix}/namespaces"},
+                       wantPlan:         false,
+                       wantFullPlanning: false,
+               },
+       }
+
+       for _, test := range tests {
+               t.Run(test.name, func(t *testing.T) {
+                       t.Parallel()
+
+                       srv := planfake.New(t, planfake.Scenario{
+                               ConfigResponse: 
planfake.ConfigResponse(test.endpoints...),
+                       })
+                       catalog, err := rest.NewCatalog(t.Context(), "rest", 
srv.URL())
+                       require.NoError(t, err)
+
+                       assert.Equal(t, test.wantPlan, 
catalog.SupportsPlanTableScan())
+                       assert.Equal(t, test.wantFullPlanning, 
catalog.SupportsFullRemoteScanPlanning())
+
+                       requests := srv.Requests()
+                       require.Len(t, requests, 1)
+                       assert.Equal(t, http.MethodGet, requests[0].Method)
+                       assert.Equal(t, "/v1/config", requests[0].Path)
+               })
+       }
+}
+
+func TestPlanFakeSynchronousPlanningCapturesRequest(t *testing.T) {
+       t.Parallel()
+
+       srv := planfake.New(t, planfake.Scenario{
+               ConfigResponse: fullPlanningConfigResponse(),
+               ExpectedTarget: &planfake.ExpectedTarget{
+                       Prefix: "catalog", Namespace: "org\x1fanalytics", 
Table: "events",
+               },
+               PlanResponse: planFakeJSONResponse(canonicalCompletedPlanJSON),
+       })
+       catalog, err := rest.NewCatalog(t.Context(), "rest", srv.URL(), 
rest.WithPrefix("catalog"))
+       require.NoError(t, err)
+
+       idempotencyKey := "0190b6c5-1c3d-7000-8000-000000000011"
+       accessDelegation := "remote-signing"
+       snapshotID := int64(123)
+       minimumRows := int64(50)
+       caseSensitive := false
+       useSnapshotSchema := true
+       response, err := catalog.PlanTableScan(t.Context(), 
table.Identifier{"org", "analytics", "events"}, rest.PlanTableScanRequest{
+               IdempotencyKey:    &idempotencyKey,
+               AccessDelegation:  &accessDelegation,
+               SnapshotID:        &snapshotID,
+               Select:            []string{"id", "payload"},
+               Filter:            
json.RawMessage(`{"type":"eq","term":"id","value":34}`),
+               MinRowsRequested:  &minimumRows,
+               CaseSensitive:     &caseSensitive,
+               UseSnapshotSchema: &useSnapshotSchema,
+               StatsFields:       []string{"id", "payload"},
+       })
+       require.NoError(t, err)
+
+       assert.Equal(t, rest.PlanStatusCompleted, response.Status)
+       require.NotNil(t, response.PlanID)
+       assert.Equal(t, "plan-sync", *response.PlanID)
+       assert.Equal(t, []string{"inline-child"}, response.PlanTasks)
+       assert.Len(t, response.FileScanTasks, 1)
+       assert.Len(t, response.DeleteFiles, 1)
+       require.Len(t, response.StorageCredentials, 1)
+       assert.Equal(t, "s3://warehouse/table/", 
response.StorageCredentials[0].Prefix)
+       assert.Equal(t, "plan-key", 
response.StorageCredentials[0].Config["s3.access-key-id"])
+
+       requests := srv.Requests()
+       require.Len(t, requests, 2)
+       request := requests[1]
+       assert.Equal(t, http.MethodPost, request.Method)
+       assert.Equal(t, 
"/v1/catalog/namespaces/org%1Fanalytics/tables/events/plan", request.Path)
+       assert.Equal(t, "catalog", request.Prefix)
+       assert.Equal(t, "org\x1fanalytics", request.Namespace)
+       assert.Equal(t, "events", request.Table)
+       assert.Equal(t, idempotencyKey, request.Header.Get("Idempotency-Key"))
+       assert.Equal(t, accessDelegation, 
request.Header.Get("X-Iceberg-Access-Delegation"))
+       assert.JSONEq(t, `{
+               "snapshot-id": 123,
+               "select": ["id", "payload"],
+               "filter": {"type": "eq", "term": "id", "value": 34},
+               "min-rows-requested": 50,
+               "case-sensitive": false,
+               "use-snapshot-schema": true,
+               "stats-fields": ["id", "payload"]
+       }`, string(request.Body))
+}
+
+func TestPlanFakeAsynchronousPlanningWaitsThroughRetry(t *testing.T) {
+       t.Parallel()
+
+       srv := planfake.New(t, planfake.Scenario{
+               ConfigResponse: fullPlanningConfigResponse(),
+               ExpectedTarget: standardPlanFakeTarget(),
+               PlanResponse:   
planFakeJSONResponse(`{"status":"submitted","plan-id":"plan-async"}`),
+               PollResponses: map[string]planfake.ResponseSequence{
+                       "plan-async": {
+                               Responses: []planfake.Response{
+                                       {
+                                               Status: 
http.StatusServiceUnavailable,
+                                               Body: json.RawMessage(`{
+                                               
"error":{"message":"busy","type":"ServiceUnavailableException","code":503}
+                                       }`),
+                                       },
+                                       
planFakeJSONResponse(`{"status":"submitted"}`),
+                                       planFakeJSONResponse(`{
+                                       "status":"completed",
+                                       "plan-tasks":["root-task"],
+                                       "storage-credentials":[{
+                                               
"prefix":"s3://warehouse/table/",
+                                               "config":{"token":"async-token"}
+                                               }]
+                               }`),
+                               },
+                       },
+               },
+       })
+       catalog, err := rest.NewCatalog(t.Context(), "rest", srv.URL(), 
rest.WithPrefix("warehouse"))
+       require.NoError(t, err)
+
+       accessDelegation := "remote-signing"
+       initial, err := catalog.PlanTableScan(t.Context(), 
standardPlanFakeIdentifier(), rest.PlanTableScanRequest{
+               AccessDelegation: &accessDelegation,
+       })
+       require.NoError(t, err)
+       require.NotNil(t, initial.PlanID)
+       assert.Equal(t, rest.PlanStatusSubmitted, initial.Status)
+
+       ctx, cancel := context.WithTimeout(t.Context(), 5*time.Second)
+       defer cancel()
+       completed, err := catalog.WaitForPlan(ctx, 
standardPlanFakeIdentifier(), *initial.PlanID, rest.WaitForPlanOptions{
+               MinDelay:          time.Millisecond,
+               MaxDelay:          2 * time.Millisecond,
+               CancelGracePeriod: time.Second,
+               MaxRetries:        10,
+               AccessDelegation:  &accessDelegation,
+       })
+       require.NoError(t, err)
+
+       assert.Equal(t, rest.PlanStatusCompleted, completed.Status)
+       assert.Equal(t, []string{"root-task"}, completed.PlanTasks)
+       require.Len(t, completed.StorageCredentials, 1)
+       assert.Equal(t, "async-token", 
completed.StorageCredentials[0].Config["token"])
+       assert.Equal(t, 3, srv.PollCount("plan-async"))
+       assert.Zero(t, srv.CancelCount("plan-async"))
+
+       requests := srv.Requests()
+       assertPlanFakeUUIDv7Header(t, requests[1])
+       pollRequests := requestsForPlanFakeOperation(requests, http.MethodGet, 
"plan-async", "")
+       require.Len(t, pollRequests, 3)
+       for _, request := range pollRequests {
+               assert.Equal(t, accessDelegation, 
request.Header.Get("X-Iceberg-Access-Delegation"))
+       }
+}
+
+func TestPlanFakeWaitCancellationCleansUpServerPlan(t *testing.T) {
+       t.Parallel()
+
+       srv := planfake.New(t, planfake.Scenario{
+               ConfigResponse: fullPlanningConfigResponse(),
+               ExpectedTarget: standardPlanFakeTarget(),
+               PlanResponse:   
planFakeJSONResponse(`{"status":"submitted","plan-id":"plan-cancel"}`),
+               PollResponses: map[string]planfake.ResponseSequence{
+                       "plan-cancel": {
+                               Responses:  
[]planfake.Response{planFakeJSONResponse(`{"status":"submitted"}`)},
+                               RepeatLast: true,
+                       },
+               },
+               CancelResponses: map[string]planfake.ResponseSequence{
+                       "plan-cancel": {
+                               Responses: []planfake.Response{{Status: 
http.StatusNoContent}},
+                       },
+               },
+       })
+       catalog, err := rest.NewCatalog(t.Context(), "rest", srv.URL(), 
rest.WithPrefix("warehouse"))
+       require.NoError(t, err)
+
+       initial, err := catalog.PlanTableScan(t.Context(), 
standardPlanFakeIdentifier(), rest.PlanTableScanRequest{})
+       require.NoError(t, err)
+       require.NotNil(t, initial.PlanID)
+
+       waitContext, cancelWait := context.WithCancel(t.Context())
+       defer cancelWait()
+       waitDone := make(chan error, 1)
+       go func() {
+               _, waitErr := catalog.WaitForPlan(waitContext, 
standardPlanFakeIdentifier(), *initial.PlanID, rest.WaitForPlanOptions{
+                       MinDelay:          time.Hour,
+                       MaxDelay:          time.Hour,
+                       CancelGracePeriod: time.Second,
+               })
+               waitDone <- waitErr
+       }()
+
+       observeContext, cancelObserve := context.WithTimeout(t.Context(), 
5*time.Second)
+       defer cancelObserve()
+       require.NoError(t, srv.WaitForPollCount(observeContext, "plan-cancel", 
1))
+       cancelWait()
+       err = waitForPlanFakeResult(t, observeContext, waitDone)
+       require.ErrorIs(t, err, context.Canceled)
+       assert.GreaterOrEqual(t, srv.PollCount("plan-cancel"), 1)
+       assert.Equal(t, 1, srv.CancelCount("plan-cancel"))
+       assert.Empty(t, srv.ScenarioErrors())
+
+       requests := requestsForPlanFakeOperation(srv.Requests(), 
http.MethodDelete, "plan-cancel", "")
+       require.Len(t, requests, 1)
+       assert.Empty(t, requests[0].Header.Get("Idempotency-Key"))
+       assert.Empty(t, requests[0].Header.Get("X-Iceberg-Access-Delegation"))
+}
+
+func TestPlanFakeWaitCancellationBoundsStalledCleanup(t *testing.T) {
+       t.Parallel()
+
+       stalledCancel := make(chan struct{})
+       srv := planfake.New(t, planfake.Scenario{
+               ConfigResponse: fullPlanningConfigResponse(),
+               ExpectedTarget: standardPlanFakeTarget(),
+               PlanResponse:   
planFakeJSONResponse(`{"status":"submitted","plan-id":"plan-stalled-cancel"}`),
+               PollResponses: map[string]planfake.ResponseSequence{
+                       "plan-stalled-cancel": {
+                               Responses:  
[]planfake.Response{planFakeJSONResponse(`{"status":"submitted"}`)},
+                               RepeatLast: true,
+                       },
+               },
+               CancelResponses: map[string]planfake.ResponseSequence{
+                       "plan-stalled-cancel": {
+                               Responses: []planfake.Response{{Status: 
http.StatusNoContent, Gate: stalledCancel}},
+                       },
+               },
+       })
+       catalog, err := rest.NewCatalog(t.Context(), "rest", srv.URL(), 
rest.WithPrefix("warehouse"))
+       require.NoError(t, err)
+
+       initial, err := catalog.PlanTableScan(t.Context(), 
standardPlanFakeIdentifier(), rest.PlanTableScanRequest{})
+       require.NoError(t, err)
+       require.NotNil(t, initial.PlanID)
+
+       waitContext, cancelWait := context.WithCancel(t.Context())
+       defer cancelWait()
+       waitDone := make(chan error, 1)
+       go func() {
+               _, waitErr := catalog.WaitForPlan(waitContext, 
standardPlanFakeIdentifier(), *initial.PlanID, rest.WaitForPlanOptions{
+                       MinDelay:          time.Hour,
+                       MaxDelay:          time.Hour,
+                       CancelGracePeriod: 100 * time.Millisecond,
+               })
+               waitDone <- waitErr
+       }()
+
+       observeContext, cancelObserve := context.WithTimeout(t.Context(), 
5*time.Second)
+       defer cancelObserve()
+       require.NoError(t, srv.WaitForPollCount(observeContext, 
"plan-stalled-cancel", 1))
+       cancelWait()
+       err = waitForPlanFakeResult(t, observeContext, waitDone)
+       require.ErrorIs(t, err, context.Canceled)
+       assert.GreaterOrEqual(t, srv.PollCount("plan-stalled-cancel"), 1)
+       assert.Equal(t, 1, srv.CancelCount("plan-stalled-cancel"))
+       assert.Empty(t, srv.ScenarioErrors())
+}
+
+func TestPlanFakeSupportsNestedAndReissuedTaskHandles(t *testing.T) {
+       t.Parallel()
+
+       srv := planfake.New(t, planfake.Scenario{
+               ConfigResponse: fullPlanningConfigResponse(),
+               ExpectedTarget: standardPlanFakeTarget(),
+               TaskResponses: map[string]planfake.ResponseSequence{
+                       "root-task": {
+                               Responses: 
[]planfake.Response{planFakeJSONResponse(`{
+                                       
"plan-tasks":["reissued-task","reissued-task"],
+                                       "file-scan-tasks":[` + 
rootFileScanTaskJSON + `]
+                               }`)},
+                       },
+                       "reissued-task": {
+                               Responses: []planfake.Response{
+                                       
planFakeJSONResponse(`{"plan-tasks":["leaf-a"]}`),
+                                       
planFakeJSONResponse(`{"plan-tasks":["leaf-b"]}`),
+                               },
+                       },
+                       "leaf-a": {
+                               Responses:  
[]planfake.Response{planFakeJSONResponse(envelopeAScanTasksJSON)},
+                               RepeatLast: true,
+                       },
+                       "leaf-b": {
+                               Responses:  
[]planfake.Response{planFakeJSONResponse(envelopeBScanTasksJSON)},
+                               RepeatLast: true,
+                       },
+                       "grandchild": {
+                               Responses: []planfake.Response{
+                                       
planFakeJSONResponse(`{"file-scan-tasks":[` + grandchildFileScanTaskJSON + 
`]}`),
+                               },
+                       },
+               },
+       })
+       catalog, err := rest.NewCatalog(t.Context(), "rest", srv.URL(), 
rest.WithPrefix("warehouse"))
+       require.NoError(t, err)
+
+       queue := []string{"root-task"}
+       responsesByHandle := make(map[string][]rest.FetchScanTasksResponse)
+       for len(queue) > 0 {
+               handle := queue[0]
+               queue = queue[1:]
+
+               response, err := catalog.FetchScanTasks(t.Context(), 
standardPlanFakeIdentifier(), rest.FetchScanTasksRequest{
+                       PlanTask: handle,
+               })
+               require.NoError(t, err)
+               responsesByHandle[handle] = append(responsesByHandle[handle], 
response)
+               queue = append(queue, response.PlanTasks...)
+       }
+
+       assert.Equal(t, 1, srv.TaskCount("root-task"))
+       assert.Equal(t, 2, srv.TaskCount("reissued-task"))
+       assert.Equal(t, 1, srv.TaskCount("leaf-a"))
+       assert.Equal(t, 1, srv.TaskCount("leaf-b"))
+       assert.Equal(t, 1, srv.TaskCount("grandchild"))
+       require.Len(t, responsesByHandle["reissued-task"], 2)
+       assert.Equal(t, []string{"leaf-a"}, 
responsesByHandle["reissued-task"][0].PlanTasks)
+       assert.Equal(t, []string{"leaf-b"}, 
responsesByHandle["reissued-task"][1].PlanTasks)
+
+       // Both independently fetched envelopes use delete reference 0 and bind 
it to
+       // a different delete path. Keeping these raw envelopes separate is 
required
+       // before the decoder turns them into domain tasks.
+       require.Len(t, responsesByHandle["leaf-a"], 1)
+       assert.Len(t, responsesByHandle["leaf-a"][0].FileScanTasks, 1)
+       assert.Len(t, responsesByHandle["leaf-a"][0].DeleteFiles, 1)
+       require.Len(t, responsesByHandle["leaf-b"], 1)
+       assert.Len(t, responsesByHandle["leaf-b"][0].FileScanTasks, 1)
+       assert.Len(t, responsesByHandle["leaf-b"][0].DeleteFiles, 1)
+
+       // Fetch each leaf again as raw JSON through an independent HTTP 
client. This
+       // keeps the fixture assertion independent from production wire types 
and binds
+       // each handle to its own envelope-local delete reference and child 
handles.
+       leafA := fetchRawPlanTaskFixture(t, srv.URL(), "leaf-a")
+       assertEnvelopeLocalFixture(t, leafA, nil,
+               "s3://warehouse/table/envelope-a.parquet",
+               "s3://warehouse/table/envelope-a-delete.parquet")
+       leafB := fetchRawPlanTaskFixture(t, srv.URL(), "leaf-b")
+       assertEnvelopeLocalFixture(t, leafB, []string{"grandchild"},
+               "s3://warehouse/table/envelope-b.parquet",
+               "s3://warehouse/table/envelope-b-delete.parquet")
+       assert.Equal(t, 2, srv.TaskCount("leaf-a"))
+       assert.Equal(t, 2, srv.TaskCount("leaf-b"))
+
+       for _, request := range srv.Requests() {
+               if request.PlanTask == "" {
+                       continue
+               }
+               assertPlanFakeUUIDv7Header(t, request)
+               assert.Empty(t, 
request.Header.Get("X-Iceberg-Access-Delegation"))
+       }
+}
+
+func TestPlanFakeModelsExpiredPlansAndTasks(t *testing.T) {
+       t.Parallel()
+
+       srv := planfake.New(t, planfake.Scenario{
+               ConfigResponse: fullPlanningConfigResponse(),
+               ExpectedTarget: standardPlanFakeTarget(),
+               PollResponses: map[string]planfake.ResponseSequence{
+                       "expired-plan": {
+                               Responses: []planfake.Response{{
+                                       Status: http.StatusNotFound,
+                                       Body: json.RawMessage(`{
+                                               
"error":{"message":"expired","type":"NoSuchPlanIdException","code":404}
+                                       }`),
+                               }},
+                       },
+               },
+               TaskResponses: map[string]planfake.ResponseSequence{
+                       "expired-task": {
+                               Responses: []planfake.Response{{
+                                       Status: http.StatusNotFound,
+                                       Body: json.RawMessage(`{
+                                               
"error":{"message":"expired","type":"NoSuchPlanTaskException","code":404}
+                                       }`),
+                               }},
+                       },
+               },
+       })
+       catalog, err := rest.NewCatalog(t.Context(), "rest", srv.URL(), 
rest.WithPrefix("warehouse"))
+       require.NoError(t, err)
+
+       _, err = catalog.FetchPlanningResult(t.Context(), 
standardPlanFakeIdentifier(), "expired-plan", rest.FetchPlanningResultOptions{})
+       require.ErrorIs(t, err, rest.ErrPlanExpired)
+
+       _, err = catalog.FetchScanTasks(t.Context(), 
standardPlanFakeIdentifier(), rest.FetchScanTasksRequest{
+               PlanTask: "expired-task",
+       })
+       require.ErrorIs(t, err, rest.ErrNoSuchPlanTask)
+}
+
+func TestPlanFakeIndependentWireFixtureContract(t *testing.T) {
+       t.Parallel()
+
+       canonical := parseRawPlanningFixture(t, canonicalCompletedPlanJSON)
+       assert.Equal(t, "completed", canonical.Status)
+       assert.Equal(t, "plan-sync", canonical.PlanID)
+       assert.Equal(t, []string{"inline-child"}, canonical.PlanTasks)
+       require.Len(t, canonical.FileScanTasks, 1)
+       require.Len(t, canonical.DeleteFiles, 1)
+
+       task := canonical.FileScanTasks[0]
+       assert.Equal(t, "data", task.DataFile.Content)
+       assert.Equal(t, "s3://warehouse/table/data.parquet", 
task.DataFile.FilePath)
+       require.Len(t, task.DataFile.Partition, 3)
+       assert.Equal(t, `34`, string(task.DataFile.Partition[0]), "integer 
partitions must remain typed JSON numbers")
+       assert.Equal(t, `"2026-07-17"`, string(task.DataFile.Partition[1]), 
"date partitions must remain typed JSON strings")
+       assert.Equal(t, `"78797A21"`, string(task.DataFile.Partition[2]), 
"fixed partitions must remain typed JSON strings")
+       assert.Equal(t, []int{1, 2}, task.DataFile.ColumnSizes.Keys)
+       assert.Equal(t, []int64{800, 1200}, task.DataFile.ColumnSizes.Values)
+       assert.Equal(t, []int{8, 9}, task.DataFile.LowerBounds.Keys)
+       assert.Equal(t, []string{"01000000", "02000000"}, 
task.DataFile.LowerBounds.Values,
+               "lower bounds must be Java-compatible hexadecimal binary 
values")
+       assert.Equal(t, []int{8, 9}, task.DataFile.UpperBounds.Keys)
+       assert.Equal(t, []string{"05000000", "0A000000"}, 
task.DataFile.UpperBounds.Values,
+               "upper bounds must be Java-compatible hexadecimal binary 
values")
+       assert.Equal(t, []int{0}, task.DeleteFileReferences)
+       assert.JSONEq(t, `{"type":"eq","term":"id","value":34}`, 
string(task.ResidualFilter))
+
+       assert.Equal(t, "position-deletes", canonical.DeleteFiles[0].Content)
+       assert.Equal(t, "s3://warehouse/table/delete.parquet", 
canonical.DeleteFiles[0].FilePath)
+       require.Len(t, canonical.DeleteFiles[0].Partition, 3)
+       assert.Equal(t, `34`, string(canonical.DeleteFiles[0].Partition[0]))
+       assert.Equal(t, `"2026-07-17"`, 
string(canonical.DeleteFiles[0].Partition[1]))
+       assert.Equal(t, `"78797A21"`, 
string(canonical.DeleteFiles[0].Partition[2]))
+       require.Len(t, canonical.StorageCredentials, 1)
+       assert.Equal(t, "s3://warehouse/table/", 
canonical.StorageCredentials[0].Prefix)
+       assert.Equal(t, map[string]string{"s3.access-key-id": "plan-key"}, 
canonical.StorageCredentials[0].Config)
+
+       assertEnvelopeLocalFixture(t, parseRawPlanningFixture(t, 
envelopeAScanTasksJSON), nil,
+               "s3://warehouse/table/envelope-a.parquet",
+               "s3://warehouse/table/envelope-a-delete.parquet")
+       assertEnvelopeLocalFixture(t, parseRawPlanningFixture(t, 
envelopeBScanTasksJSON), []string{"grandchild"},
+               "s3://warehouse/table/envelope-b.parquet",
+               "s3://warehouse/table/envelope-b-delete.parquet")
+}
+
+func standardPlanFakeTarget() *planfake.ExpectedTarget {
+       return &planfake.ExpectedTarget{Prefix: "warehouse", Namespace: 
"analytics", Table: "events"}
+}
+
+func standardPlanFakeIdentifier() table.Identifier {
+       return table.Identifier{"analytics", "events"}
+}
+
+func waitForPlanFakeResult(t *testing.T, ctx context.Context, result <-chan 
error) error {
+       t.Helper()
+
+       select {
+       case err := <-result:
+               return err
+       case <-ctx.Done():
+               t.Fatalf("timed out waiting for WaitForPlan to return: %v", 
ctx.Err())
+
+               return nil
+       }
+}
+
+type rawPlanningFixture struct {
+       Status             string                        `json:"status"`
+       PlanID             string                        `json:"plan-id"`
+       PlanTasks          []string                      `json:"plan-tasks"`
+       FileScanTasks      []rawFileScanTaskFixture      
`json:"file-scan-tasks"`
+       DeleteFiles        []rawDeleteFileFixture        `json:"delete-files"`
+       StorageCredentials []rawStorageCredentialFixture 
`json:"storage-credentials"`
+}
+
+type rawFileScanTaskFixture struct {
+       DataFile             rawDataFileFixture `json:"data-file"`
+       DeleteFileReferences []int              `json:"delete-file-references"`
+       ResidualFilter       json.RawMessage    `json:"residual-filter"`
+}
+
+type rawDataFileFixture struct {
+       SpecID      int                `json:"spec-id"`
+       Partition   []json.RawMessage  `json:"partition"`
+       Content     string             `json:"content"`
+       FilePath    string             `json:"file-path"`
+       LowerBounds rawValueMapFixture `json:"lower-bounds"`
+       UpperBounds rawValueMapFixture `json:"upper-bounds"`
+       ColumnSizes rawCountMapFixture `json:"column-sizes"`
+}
+
+type rawDeleteFileFixture struct {
+       SpecID    int               `json:"spec-id"`
+       Partition []json.RawMessage `json:"partition"`
+       Content   string            `json:"content"`
+       FilePath  string            `json:"file-path"`
+}
+
+type rawValueMapFixture struct {
+       Keys   []int    `json:"keys"`
+       Values []string `json:"values"`
+}
+
+type rawCountMapFixture struct {
+       Keys   []int   `json:"keys"`
+       Values []int64 `json:"values"`
+}
+
+type rawStorageCredentialFixture struct {
+       Prefix string            `json:"prefix"`
+       Config map[string]string `json:"config"`
+}
+
+func parseRawPlanningFixture(t *testing.T, body string) rawPlanningFixture {
+       t.Helper()
+
+       var fixture rawPlanningFixture
+       require.NoError(t, json.Unmarshal([]byte(body), &fixture))
+
+       return fixture
+}
+
+func fetchRawPlanTaskFixture(t *testing.T, serverURL, planTask string) 
rawPlanningFixture {
+       t.Helper()
+
+       body, err := json.Marshal(map[string]string{"plan-task": planTask})
+       require.NoError(t, err)
+       request, err := http.NewRequestWithContext(t.Context(), http.MethodPost,
+               
serverURL+"/v1/warehouse/namespaces/analytics/tables/events/tasks", 
bytes.NewReader(body))
+       require.NoError(t, err)
+       request.Header.Set("Content-Type", "application/json")
+       idempotencyKey, err := uuid.NewV7()
+       require.NoError(t, err)
+       request.Header.Set("Idempotency-Key", idempotencyKey.String())
+
+       response, err := http.DefaultClient.Do(request)
+       require.NoError(t, err)
+       responseBody, readErr := io.ReadAll(response.Body)
+       closeErr := response.Body.Close()
+       require.NoError(t, readErr)
+       require.NoError(t, closeErr)
+       require.Equal(t, http.StatusOK, response.StatusCode)
+
+       return parseRawPlanningFixture(t, string(responseBody))
+}
+
+func assertEnvelopeLocalFixture(
+       t *testing.T,
+       fixture rawPlanningFixture,
+       wantPlanTasks []string,
+       wantDataPath, wantDeletePath string,
+) {
+       t.Helper()
+
+       assert.Equal(t, wantPlanTasks, fixture.PlanTasks)
+       require.Len(t, fixture.FileScanTasks, 1)
+       require.Len(t, fixture.DeleteFiles, 1)
+       task := fixture.FileScanTasks[0]
+       assert.Equal(t, wantDataPath, task.DataFile.FilePath)
+       assert.Equal(t, []int{0}, task.DeleteFileReferences,
+               "delete reference 0 must resolve within this response envelope")
+       assert.JSONEq(t, `true`, string(task.ResidualFilter))
+       assert.NotNil(t, task.DataFile.Partition)
+       assert.Empty(t, task.DataFile.Partition)
+       assert.Equal(t, wantDeletePath, fixture.DeleteFiles[0].FilePath)
+       assert.NotNil(t, fixture.DeleteFiles[0].Partition)
+       assert.Empty(t, fixture.DeleteFiles[0].Partition)
+}
+
+func fullPlanningConfigResponse() planfake.Response {

Review Comment:
     Config responses here always carry empty overrides, so the prefix only 
ever comes from WithPrefix — the client's config-override→prefix merge path is 
never exercised, and a regression there would misroute every planning request 
while these tests stay green. Since ConfigResponse is just a convenience over 
Response{Body:...}, you can hand-author overrides:{"prefix":"..."} and assert 
subsequent requests carry it. Lower priority; multi-entry storage-credentials 
selection is decoding (out of scope here), flagging so the config-prefix half 
doesn't get overlooked.
   



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