Derived Column: Assigning and and Using as a Condition

Hi,
I have 1 derived column component with 2 derived columns (see below).
1st derived col:
DerivedColName: col1
Derived Column: Replace 'col1'
Expression: REPLACENULL(col1, col1_DHH)
2nd derived col:
DerivedColName: col2
Derived Column: Replace 'col2'
Expression: ISNULL(col1) ? col2_DHH : col2
As you can see, col1 is being used as a condition to determine the value to assign to col2.
But at the same time, col1 is assigned with a value that depends on the result of REPLACENULL.
My question is, is col1's value in (ISNULL(col1) ? col2_DHH : col2) the original value i.e. before it evaluates the REPLACENULL expression?
I have tested this and it seems that col1 value is the original value (which is what i need). I just want to confirm from you guys that this is always the case i.e. it is deterministic.
Thanks!

If they're in same derived column then it takes original value ie prior to start of derived column
If you want evaluated value to be used for second expression then you need to use two derived tasks and join first to second with precedence constraint with option On Success
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Visakh
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My OLE DB Source has the following SQL command task:
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Please follow basic Netiquette and post the DDL we need to answer this. Follow industry and ANSI/ISO standards in your data. You should follow ISO-11179 rules for naming data elements. You should follow ISO-8601 rules for displaying temporal data. We need
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Derived Column: Assigning and and Using as a Condition

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