Union All Component Silently Changes Output Field Length

Jul 25, 2007

To simulate problem do follows:

1. Add Script source component.

2. Add 2 string output collumns: F1 length 50, F2 length 110

3. Add Union All component connected to Script source component

4. Add Script transformation component connected to Union All component

5. Mark F1 and F2 as input collumns

6. In the Input and Output section of the script transformation component check that length of the fields is 50 and 110 correspondingly

7. Edit Union All component: change Union All Input 1 to <ignore> for Output collumns F1, and F2; change Union All Input 1 to F2 for F1 and F1 for F2; change back <ignore> for F1, <ignore> for F2; set back F1 for F1, F2 for F2; Click OK to save

8. In the Input and Output section of the script transformation component check that length of the both fields is 110 now.



So, be careful to select output columns values in Union All component. If you choose wrong field by accident, and replaced it with correct one straight away, the length of output column could be stored not as you expect an need.

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I have found not very good behavior of Union All Data Flow Component.

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