public static com.google.cloud.talent.v4beta1.SearchJobsRequest.CustomRankingInfo
        parseDelimitedFrom(java.io.InputStream input) throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3.parseDelimitedWithIOException(PARSER, input);
    }
<pre>
Required. Controls over how job documents get ranked on top of existing
relevance score (determined by API algorithm). A combination of the
ranking expression and relevance score is used to determine job's final
ranking position.

The syntax for this expression is a subset of Google SQL syntax.

Supported operators are: +, -, *, /, where the left and right side of
the operator is either a numeric
[Job.custom_attributes][google.cloud.talent.v4beta1.Job.custom_attributes]
key, integer/double value or an expression that can be evaluated to a
number.

Parenthesis are supported to adjust calculation precedence. The
expression must be &lt; 200 characters in length.

The expression is considered invalid for a job if the expression
references custom attributes that are not populated on the job or if the
expression results in a divide by zero. If an expression is invalid for a
job, that job is demoted to the end of the results.

Sample ranking expression
(year + 25) * 0.25 - (freshness / 0.5)
</pre>

<code>string ranking_expression = 2 [(.google.api.field_behavior) = REQUIRED];</code>

@return The bytes for rankingExpression.
java-talent/proto-google-cloud-talent-v4beta1/src/main/java/com/google/cloud/talent/v4beta1/SearchJobsRequest.java