private void ensureUnitsIsMutable() {
      if (!((bitField0_ & 0x00000002) != 0)) {
        units_ = new java.util.ArrayList<java.lang.Integer>(units_);
        bitField0_ |= 0x00000002;
      }
    }
<pre>
Required. Type of filter.
</pre>

<code>
.google.cloud.talent.v4.CompensationFilter.FilterType type = 1 [(.google.api.field_behavior) = REQUIRED];
</code>

@return This builder for chaining.
java-talent/proto-google-cloud-talent-v4/src/main/java/com/google/cloud/talent/v4/CompensationFilter.java