Add child workflow versioning override API

Author: Shivs11

openapi/openapiv2.json

@@ -19250,7 +19250,8 @@
       "enum": [
         "START_CHILD_WORKFLOW_EXECUTION_FAILED_CAUSE_UNSPECIFIED",
         "START_CHILD_WORKFLOW_EXECUTION_FAILED_CAUSE_WORKFLOW_ALREADY_EXISTS",
-        "START_CHILD_WORKFLOW_EXECUTION_FAILED_CAUSE_NAMESPACE_NOT_FOUND"
+        "START_CHILD_WORKFLOW_EXECUTION_FAILED_CAUSE_NAMESPACE_NOT_FOUND",
+        "START_CHILD_WORKFLOW_EXECUTION_FAILED_CAUSE_INVALID_VERSIONING_OVERRIDE"
       ],
       "default": "START_CHILD_WORKFLOW_EXECUTION_FAILED_CAUSE_UNSPECIFIED"
     },
@@ -19371,6 +19372,10 @@
         "timeSkippingStatePropagation": {
           "$ref": "#/definitions/v1TimeSkippingStatePropagation",
           "description": "The time-skipping state propagated from the parent workflow. This can be nil if no time skipping\nhas occurred or there is no previous run."
+        },
+        "versioningOverride": {
+          "$ref": "#/definitions/v1VersioningOverride",
+          "description": "Versioning override requested for the child workflow. If present, this explicit override\ntakes precedence over versioning behavior inherited from the parent workflow."
         }
       }
     },

openapi/openapiv3.yaml

@@ -16732,6 +16732,7 @@ components:
             - START_CHILD_WORKFLOW_EXECUTION_FAILED_CAUSE_UNSPECIFIED
             - START_CHILD_WORKFLOW_EXECUTION_FAILED_CAUSE_WORKFLOW_ALREADY_EXISTS
             - START_CHILD_WORKFLOW_EXECUTION_FAILED_CAUSE_NAMESPACE_NOT_FOUND
+            - START_CHILD_WORKFLOW_EXECUTION_FAILED_CAUSE_INVALID_VERSIONING_OVERRIDE
           type: string
           format: enum
         control:
@@ -16829,6 +16830,12 @@ components:
           description: |-
             The time-skipping state propagated from the parent workflow. This can be nil if no time skipping
              has occurred or there is no previous run.
+        versioningOverride:
+          allOf:
+            - $ref: '#/components/schemas/VersioningOverride'
+          description: |-
+            Versioning override requested for the child workflow. If present, this explicit override
+             takes precedence over versioning behavior inherited from the parent workflow.
     StartNexusOperationExecutionRequest:
       type: object
       properties:

temporal/api/command/v1/message.proto

@@ -16,6 +16,7 @@ import "temporal/api/enums/v1/command_type.proto";
 import "temporal/api/common/v1/message.proto";
 import "temporal/api/failure/v1/message.proto";
 import "temporal/api/taskqueue/v1/message.proto";
+import "temporal/api/workflow/v1/message.proto";
 import "temporal/api/sdk/v1/user_metadata.proto";
 import "temporal/api/sdk/v1/event_group_marker.proto";
 
@@ -221,6 +222,9 @@ message StartChildWorkflowExecutionCommandAttributes {
     // Priority metadata. If this message is not present, or any fields are not
     // present, they inherit the values from the workflow.
     temporal.api.common.v1.Priority priority = 18;
+    // Versioning override for the child workflow. If present, this explicit override takes
+    // precedence over versioning behavior inherited from the parent workflow.
+    temporal.api.workflow.v1.VersioningOverride versioning_override = 19;
 }
 
 message ProtocolMessageCommandAttributes {

temporal/api/enums/v1/failed_cause.proto

@@ -89,6 +89,7 @@ enum StartChildWorkflowExecutionFailedCause {
     START_CHILD_WORKFLOW_EXECUTION_FAILED_CAUSE_UNSPECIFIED = 0;
     START_CHILD_WORKFLOW_EXECUTION_FAILED_CAUSE_WORKFLOW_ALREADY_EXISTS = 1;
     START_CHILD_WORKFLOW_EXECUTION_FAILED_CAUSE_NAMESPACE_NOT_FOUND = 2;
+    START_CHILD_WORKFLOW_EXECUTION_FAILED_CAUSE_INVALID_VERSIONING_OVERRIDE = 3;
 }
 
 enum CancelExternalWorkflowExecutionFailedCause {
@@ -136,4 +137,3 @@ enum ResourceExhaustedScope {
     // Exhausted resource is a namespace-level resource.
     RESOURCE_EXHAUSTED_SCOPE_SYSTEM = 2;
 }
-

temporal/api/history/v1/message.proto

@@ -790,6 +790,10 @@ message StartChildWorkflowExecutionInitiatedEventAttributes {
     // The time-skipping state propagated from the parent workflow. This can be nil if no time skipping
     // has occurred or there is no previous run.
     temporal.api.common.v1.TimeSkippingStatePropagation time_skipping_state_propagation = 23;
+
+    // Versioning override requested for the child workflow. If present, this explicit override
+    // takes precedence over versioning behavior inherited from the parent workflow.
+    temporal.api.workflow.v1.VersioningOverride versioning_override = 24;
 }
 
 message StartChildWorkflowExecutionFailedEventAttributes {