ContainerPolicy policy = getContainerPolicy();
Object value = policy.containerInstance();
ObjectBuilder objectBuilder = getDescriptor().getObjectBuilder();
// Extract the primary key of the source object, to filter only the joined rows for that object.
Object sourceKey = objectBuilder.extractPrimaryKeyFromRow(row, executionSession);
// If the query was using joining, all of the result rows by primary key will have been computed.
List<AbstractRecord> rows = joinManager.getDataResultsByPrimaryKey().get(sourceKey);
// If no 1-m rows were fetch joined, then get the value normally,
// this can occur with pagination where the last row may not be complete.
if (rows == null) {