Github user eliaslevy commented on the issue:
https://github.com/apache/flink/pull/6076
Something else missing from this page is a discussion of what happens to
the timestamp attached to records when they go through different operations.
E.g. what happens to a record timestamp when it goes through `map` or when
multiple records are emitted from `flatMap`? What is the timestamp of an
record emitted by an operation on a window or an aggregation operation on
non-windowed stream? None of these are discussed anywhere in the documentation
from what I can tell.
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