3416232 - How to check lastIndexTime in the query of solr indexed type?

Sometimes lastIndexTime value needs to be checked to determine the data content of the update index.

For example, 

        SELECT DISTINCT {p:PK} AS pk, {p:code} AS code, {p:varianttype} AS varianttype
        FROM {Product AS p LEFT JOIN CustomerReview AS cr ON {cr:product}={p:PK} }
        WHERE {p:modifiedtime} >= ?lastIndexTime OR {cr:modifiedtime} >= ?lastIndexTime

The following content describes how to check lastIndexTime.

solr lastIndexTime, update index last index time , KBA , CEC-SCC-COM-SRC-SER , Search and Navigation , How To