public com.google.protobuf.Duration.Builder getStartOffsetBuilder() {
        bitField0_ |= 0x00000001;
        onChanged();
        return getStartOffsetFieldBuilder().getBuilder();
      }
<pre>
Start time offset of the partition.
</pre>

<code>.google.protobuf.Duration start_offset = 1;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/Partition.java