private com.google.protobuf.MapField<java.lang.String, java.lang.Long> internalGetHistogram() {
    if (histogram_ == null) {
      return com.google.protobuf.MapField.emptyMapField(HistogramDefaultEntryHolder.defaultEntry);
    }
    return histogram_;
  }
<pre>
Requested histogram expression.
</pre>

<code>string histogram_query = 1;</code>

@return The bytes for histogramQuery.
java-talent/proto-google-cloud-talent-v4/src/main/java/com/google/cloud/talent/v4/HistogramQueryResult.java