Fabian Hueske created FLINK-7821:
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Summary: Replace Table.limit() by Table.fetch() and Table.offset()
Key: FLINK-7821
URL: https://issues.apache.org/jira/browse/FLINK-7821
Project: Flink
Issue Type: Improvement
Components: Table API & SQL
Affects Versions: 1.4.0
Reporter: Fabian Hueske
Assignee: Fabian Hueske
Priority: Minor
The Table API method limit() exists in two variants:
- {{limit(offset)}} returns all but the first {{offset}} records.
- {{limit(offset, fetch)}} returns {{fetch}} records starting from the
{{offset}}'s record.
Especially, the behavior of {{limit(offset)}} is confusing because one would
rather expect a behavior of returning the {{offset}} first records instead of
all but the {{offset}} first records.
Moreover, the only way to return the first {{x}} records is to specify a {{0}}
offset as {{limit(0, x)}}.
I propose to replace both {{limit()}} variants by two new methods
{{Table.offset(offset)}} and {{Table.fetch(fetch)}} that can be freely combined:
{code}
table.orderBy(...).fetch(x)
table.orderBy(...).offset(x)
table.orderBy(...).fetch(x).offset(y)
table.orderBy(...).offset(x).fetch(y)
{code}
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