add validate_span_filter_condition to project type

app/schema.graphql

@@ -556,6 +556,7 @@ type Project implements Node {
   spanEvaluationSummary(evaluationName: String!, timeRange: TimeRange, filterCondition: String): EvaluationSummary
   documentEvaluationSummary(evaluationName: String!, timeRange: TimeRange, filterCondition: String): DocumentEvaluationSummary
   streamingLastUpdatedAt: DateTime
+  validateSpanFilterCondition(condition: String!): ValidationResult!
 }
 
 type ProjectConnection {

src/phoenix/server/api/types/Project.py

@@ -19,6 +19,7 @@
     connection_from_list,
 )
 from phoenix.server.api.types.Span import Span, to_gql_span
+from phoenix.server.api.types.ValidationResult import ValidationResult
 from phoenix.trace.dsl import SpanFilter
 from phoenix.trace.schemas import SpanID, TraceID
 
@@ -219,3 +220,20 @@ def streaming_last_updated_at(
         self,
     ) -> Optional[datetime]:
         return self.project.last_updated_at
+
+    @strawberry.field
+    def validate_span_filter_condition(self, condition: str) -> ValidationResult:
+        project = self.project
+        valid_eval_names = project.get_span_evaluation_names() if project else ()
+        try:
+            SpanFilter(
+                condition=condition,
+                evals=project,
+                valid_eval_names=valid_eval_names,
+            )
+            return ValidationResult(is_valid=True, error_message=None)
+        except SyntaxError as e:
+            return ValidationResult(
+                is_valid=False,
+                error_message=e.msg,
+            )