Disabling retries by setting `retryableCodes` to empty Set doesn't stop from retrying

[patrykwoj91]

Hello, I am using google-cloud-spanner 6.69.0 for java. I am trying to disable retry mechanism for :

com.google.cloud.spanner.SpannerException: UNAVAILABLE: io.grpc.StatusRuntimeException: UNAVAILABLE: io exception - Statement: 'SELECT 1'

To do that I have followed the documentation, and set:

SpannerOptions.Builder spannerOptionsBuilder = SpannerOptions.newBuilder(); 

spannerOptionsBuilder.getSpannerStubSettingsBuilder().streamingReadSettings().setRetryableCodes(Collections.emptySet());        

spannerOptionsBuilder.getSpannerStubSettingsBuilder().executeStreamingSqlSettings().setRetryableCodes(Collections.emptySet());

However, this doesn't seem to have a valid effect because in the retrying loop: https://github.com/googleapis/java-spanner/blob/6b7e6ca109ea9679b5e36598d3c343fa40bff724/google-cloud-spanner/src/main/java/com/google/cloud/spanner/ResumableStreamIterator.java#L273

method isRetryable is defined as follows:

boolean isRetryable(SpannerException spannerException) {
    return spannerException.isRetryable()
        || retryableCodes.contains(
            GrpcStatusCode.of(spannerException.getErrorCode().getGrpcStatusCode()).getCode());
  }

which basically ignores retryableCodes setting, as long as exception itself is marked as retryable.

Not sure if this is a bug or intended behavior, but this still causes the retries to happen, despite setting retryableCodes to empty.