FENNEL: fix cast varchar to date type bug, unit test cases are pending
FENNEL: fix cast varchar to date type bug, unit test cases are pending

[git-p4: depot-paths = "//open/dev/": change = 5025]

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