feat: add write_mode support for BigQuery Storage Write API v1 (#228)

Committer: @anahan
PiperOrigin-RevId: 414771198
Source-Link: googleapis/googleapis@8a2398e
Source-Link: googleapis/googleapis-gen@9df7ea3
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packages/google-cloud-bigquery-storage/protos/google/cloud/bigquery/storage/v1/stream.proto

@@ -171,6 +171,16 @@ message WriteStream {
     BUFFERED = 3;
   }
 
+  // Mode enum of the stream.
+  enum WriteMode {
+    // Unknown type.
+    WRITE_MODE_UNSPECIFIED = 0;
+
+    // Insert new records into the table.
+    // It is the default value if customers do not specify it.
+    INSERT = 1;
+  }
+
   // Output only. Name of the stream, in the form
   // `projects/{project}/datasets/{dataset}/tables/{table}/streams/{stream}`.
   string name = 1 [(google.api.field_behavior) = OUTPUT_ONLY];
@@ -193,4 +203,7 @@ message WriteStream {
   // compatible with this schema to send in initial `AppendRowsRequest`.
   // The table schema could go out of date during the life time of the stream.
   TableSchema table_schema = 5 [(google.api.field_behavior) = OUTPUT_ONLY];
+
+  // Immutable. Mode of the stream.
+  WriteMode write_mode = 7 [(google.api.field_behavior) = IMMUTABLE];
 }