Add merge many-to-one transformation

[igarashitm]

xref: https://issues.redhat.com/browse/ENTESB-12357

Merge multiple source collection fields into target collection. Which is the best action name, merge or join?

/Address1<a>/line1 => /TargetAddr<b>/line1
/Address1<a>/line2 => /TargetAddr<b>/line2
...
/Address2<c>/line1 => /TargetAddr<b>/line1
/Address2<c>/line2 => /TargetAddr<b>/line2

where b = a + c

[pleacu]

append implies order where merge just implies they're all in one bucket.

[igarashitm]

Good point, plus Append action already exists for string. Let's avoid it.

[stale]

This issue has been automatically marked as stale because it has not had any activity since 90 days. It will be closed if no further activity occurs within 7 days. Thank you for your contributions!

[Shrishti1234]

I also needed this feature in my use case. When this feature will be released or there is some another way to handle the same scenario in atlasmap?

[stale]

This issue has been automatically marked as stale because it has not had any activity since 90 days. It will be closed if no further activity occurs within 7 days. Thank you for your contributions!

[stale]

This issue has been automatically marked as stale because it has not had any activity since 90 days. It will be closed if no further activity occurs within 7 days. Thank you for your contributions!