private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.speech.v2.DeletePhraseSetRequest,
            com.google.cloud.speech.v2.DeletePhraseSetRequest.Builder,
            com.google.cloud.speech.v2.DeletePhraseSetRequestOrBuilder>
        getDeletePhraseSetRequestFieldBuilder() {
      if (deletePhraseSetRequestBuilder_ == null) {
        if (!(requestCase_ == 19)) {
          request_ = com.google.cloud.speech.v2.DeletePhraseSetRequest.getDefaultInstance();
        }
        deletePhraseSetRequestBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.speech.v2.DeletePhraseSetRequest,
                com.google.cloud.speech.v2.DeletePhraseSetRequest.Builder,
                com.google.cloud.speech.v2.DeletePhraseSetRequestOrBuilder>(
                (com.google.cloud.speech.v2.DeletePhraseSetRequest) request_,
                getParentForChildren(),
                isClean());
        request_ = null;
      }
      requestCase_ = 19;
      onChanged();
      return deletePhraseSetRequestBuilder_;
    }
<pre>
The DeletePhraseSetRequest that spawned the Operation.
</pre>

<code>.google.cloud.speech.v2.DeletePhraseSetRequest delete_phrase_set_request = 19;</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/OperationMetadata.java