MgGwsFeatureReader does not work with left-out joins

[Aleck]

When GWS query engine is involved in querying features, an MgServerGwsFeatureReader will be created for reading features.

In MgServerGwsFeatureReader::ReadNext() method, it'll get a right-side feature iterator for a left side feature using the following code:

retVal = secondaryIter->ReadNext(); If (retval) {

return the right-side feature ...

} else {

m_bAdvancePrimaryIterator = true;

}

Therefore, if there is no corresponding right-side feature, it'll skip the left side feature, which is wrong for left outer joins.

The solution is to check if it is a left outer join. If so, the left-side feature still need to be returned with the right side feature property value set to NULL

[Aleck]

patch

[brucedechant]

Fixed. See submission r4367