Yakov Goldberg created FLINK-4804:
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Summary: Grouping.first() function usage fails
Key: FLINK-4804
URL: https://issues.apache.org/jira/browse/FLINK-4804
Project: Flink
Issue Type: Bug
Reporter: Yakov Goldberg
Trying to use Grouping.first() in following example:
{code}
dd2 = env.from_elements((1, "data"), (1, "hello"), (1, "z")) #dd2 =
env.from_elements("data", "hello", "z", "tree","hello","world","hello", "car")
dd2 \ .group_by(0) \ .sort_group(1, Order.ASCENDING) \
.first(2) \ .reduce_group(PlainReduce(), combinable=True)
{code}
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