[FLINK-8002] [table] Fix join window boundary for LESS_THAN and GREATER_THAN predicates.

[fhueske]

What is the purpose of the change

Fix the computation of join window boundaries for LESS_THAN and GREATER_THAN predicates if the time attribute of the right input is referenced on the left side of the predicate.

Brief change log

• check which input is referenced on which side of the predicate to determine whether to add or subtract 1 from the boundary.

Verifying this change

• JoinTest was extended to verify the computation of the boundaries.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? n/a

[fhueske]

Merging