Github user patricker commented on the issue:
https://github.com/apache/nifi/pull/1513
@ilyatau Why do you feel that this request isn't finished?
While I do have a newer version, the functionality it adds is a bit more
advanced and I've had a hard time automating the testing.
The additional functionality I have working will generate a premature right
boundary to reduce the number of records brought back. You might think that
this is already the point of Generate Table Fetch, but I found that even with
an indexed timestamp column you still have to page the index when paging
through data on some systems. In one case we found that on SAP Hana we ran into
some internal limitations which did not allow you to page past more than 2
billion rows of data. The table we were loading with Generate Table Fetch had
~6 billion rows. Using the un-committed change you can provide a per execution
limit to Generate Table Fetch so that it will only generate pages of `x` size
for the first `y` rows in the table.
When I tried to test this on SQL Lite it did not work, though it is working
on other SQL systems we've tried it on.
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