proto-google-cloud-bigquerystorage-v1alpha2/src/main/java/com/google/cloud/bigquery/storage/v1alpha2/Storage.java
/**
       *
       *
       * <pre>
       * Required. The stream that is the target of the append operation. This value must be
       * specified for the initial request. If subsequent requests specify the
       * stream name, it must equal to the value provided in the first request.
       * </pre>
       *
       * <code>string write_stream = 1 [(.google.api.field_behavior) = REQUIRED];</code>
       *
       * @return This builder for chaining.
       */

Required. The stream that is the target of the append operation. This value must be
specified for the initial request. If subsequent requests specify the
stream name, it must equal to the value provided in the first request.

string write_stream = 1 [(.google.api.field_behavior) = REQUIRED].

@return This builder for chaining.
Required . The stream that is the target of the append operation . This value must be specified for the initial request . If subsequent requests specify the stream name it must equal to the value provided in the first request . string write_stream = 1 [ ( . google . api . field_behavior ) = REQUIRED ] . @return This builder for chaining .
public Builder clearWriteStream() {
        writeStream_ = getDefaultInstance().getWriteStream();
        onChanged();
        return this;
      }
public Builder clearWriteStream ( ) { writeStream_ = getDefaultInstance ( ) . getWriteStream ( ) ; onChanged ( ) ; return this ; }
<pre>
 Required.
<pre > Required .