gRPC spec update: Add support for selecting specific columns while li…

…sting recordings metadata (#8049)

Providing a selection of columns is optional, but if provided, it's
expected that the remote store will only project and return those
columns.

crates/store/re_protos/proto/rerun/v0/remote_store.proto

@@ -106,7 +106,16 @@ enum EncoderVersion {
 
 // ----------------- ListRecordings -----------------
 
-message ListRecordingsRequest {}
+message ListRecordingsRequest {
+    // define which columns should be returned / projected
+    // we define a separate message to make it optional.
+    // If not provided, all columns should be returned
+    ColumnProjection column_projection = 1;
+}
+
+message ColumnProjection {
+    repeated string columns = 1;
+}
 
 message ListRecordingsResponse {
     repeated RecordingMetadata recordings = 1;

rerun_py/src/remote.rs

@@ -54,7 +54,9 @@ impl PyConnection {
     /// List all recordings registered with the node.
     fn list_recordings(&mut self) -> PyResult<Vec<PyRecordingMetadata>> {
         self.runtime.block_on(async {
-            let request = ListRecordingsRequest {};
+            let request = ListRecordingsRequest {
+                column_projection: None,
+            };
 
             let resp = self
                 .client