Conditional split based on array variable - sql-server-2008

Question

I need something like a T-SQL IN statement to filter records in a conditional split based on an array variable (or something similar)
I need to have a list of items that a column can be filtered on.

Answer 1

As Filip has indicated, there is no IN operator in the expression language. I did come up with some options though as I thought this sounded like an interesting problem.
My long analysis is on my blog: Filter list in SSIS
Conditional split
If you can transform your list of values into a delimited string, then you can use FINDSTRING and the current value to determine whether it's in the list. This provided the best throughput for my testing scenario. (FINDSTRING(#[User::MyListStr], [MyColumn],1)) > 0
Script task
I had assumed using a List in a script task to determine membership would provide the best performance but I was wrong. Row.IsInList = MyListObj.Contains(Row.MyColumn);
Lookup/Cache Connection Manager
The third approach I had come up with was dumping the list into a Cached Connection Manager and then using that in a lookup task. I thought this was the easiest to conceptualize and maintain but the performance was lacking.
Conclusion
For this problem domain, the FINDSTRING approach was the most efficient, by a considerable margin. The other three approaches consistently averaged a throughput of within 7 rows per millisecond of each other. I did find it interesting that the standard deviation of the FINDSTRING approach fluctuated so much. While this box is older and slower, there was not a considerable amount of activity going on during the package executions.

Answer 2

There is no IN operator in SSIS expression operators. And there is no similar operator. Since there is no such operator, You can't do that with built-in expressions and built-in Conditional Split. But You can do one of the following:
use Script Transformation to check if particular column has that is in variable array, and add additional column (flag) with value 1 if it contains, 0 if not; then use Conditional Split on this flag added in Script Transformation, or
it's better to put variables in database table and then use Lookup or Merge Join to check if row exists