FENNEL. ExecStreamGraph guards against adding or merging a stream-node with a duplicated name.
FENNEL. ExecStreamGraph guards against adding or merging a stream-node with a duplicated name.

[git-p4: depot-paths = "//open/dt/dev/": change = 4821]

LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb