private com.google.protobuf.MapField<java.lang.String, java.lang.Long>
        internalGetMutableHistogram() {
      if (histogram_ == null) {
        histogram_ =
            com.google.protobuf.MapField.newMapField(HistogramDefaultEntryHolder.defaultEntry);
      }
      if (!histogram_.isMutable()) {
        histogram_ = histogram_.copy();
      }
      bitField0_ |= 0x00000002;
      onChanged();
      return histogram_;
    }
<pre>
Requested histogram expression.
</pre>

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

@param value The bytes for histogramQuery to set.
@return This builder for chaining.
java-talent/proto-google-cloud-talent-v4/src/main/java/com/google/cloud/talent/v4/HistogramQueryResult.java