Implement CONTAINS operator

[agershun]

Like:

    select * from animaltype where races contains (name.toLowerCase().subString(0,1) = 'e')

It is similar to IN operator.

[mathiasrw]

I might dont get the picture here - but looks to mee like the example is trying to assign 'e' to a string

anyway. Might not be important that I dont get the example. The CONTAINS looks useful and is well described here

https://msdn.microsoft.com/en-us/library/ms187787.aspx

[mathiasrw]

This should be a small change to the parser

[renxida]

Bumping issue. I find myself needing this too.