@java.lang.Override
  public int hashCode() {
    if (memoizedHashCode != 0) {
      return memoizedHashCode;
    }
    int hash = 41;
    hash = (19 * hash) + getDescriptor().hashCode();
    if (hasBoundingPoly()) {
      hash = (37 * hash) + BOUNDING_POLY_FIELD_NUMBER;
      hash = (53 * hash) + getBoundingPoly().hashCode();
    }
    hash = (37 * hash) + PRODUCT_SET_FIELD_NUMBER;
    hash = (53 * hash) + getProductSet().hashCode();
    if (getProductCategoriesCount() > 0) {
      hash = (37 * hash) + PRODUCT_CATEGORIES_FIELD_NUMBER;
      hash = (53 * hash) + getProductCategoriesList().hashCode();
    }
    hash = (37 * hash) + FILTER_FIELD_NUMBER;
    hash = (53 * hash) + getFilter().hashCode();
    hash = (29 * hash) + getUnknownFields().hashCode();
    memoizedHashCode = hash;
    return hash;
  }
<pre>
The filtering expression. This can be used to restrict search results based
on Product labels. We currently support an AND of OR of key-value
expressions, where each expression within an OR must have the same key. An
'=' should be used to connect the key and value.

For example, "(color = red OR color = blue) AND brand = Google" is
acceptable, but "(color = red OR brand = Google)" is not acceptable.
"color: red" is not acceptable because it uses a ':' instead of an '='.
</pre>

<code>string filter = 8;</code>

@return The bytes for filter.
java-vision/proto-google-cloud-vision-v1p3beta1/src/main/java/com/google/cloud/vision/v1p3beta1/ProductSearchParams.java