Changes between Version 4 and Version 5 of MapGuideRfc123

Timestamp:

Oct 27, 2011, 5:56:56 AM (13 years ago)

Author:

jng

Comment:

--

MapGuideRfc123

@@ -56 +56 @@
  * The Feature Source this extended feature class belongs to joins with another feature class from '''the same feature source''' (this is because FDO Joins work within the context of the same connection). The feature class being joined on cannot itself be an extended feature class.
  * The extended feature class only contains one join. Supporting chained or multiple joins is beyond the scope of this RFC.
+ * If this extended feature class is being queried with a filter, the filter does not contain any references to properties on the feature class to be joined on.
  * The type of join being performed is supported by the underlying FDO provider. 
 
@@ -119 +120 @@
 === Aggregates ===
 
-Support for aggregate operations is beyond the scope of this RFC.
+If a SelectAggregates operation is invoked on an extended feature class, the same FDO join optimization condition checks are done against the extended feature class and its feature source.
+
+In addition to normal select aggregate command processing, the same join criteria and join filter processing will be applied to the select aggregate command.
 
 == Implications ==