This closes #12592

This closes #12753

[FLINK-18399][table-api-java] Fix TableResult#print can not print the result of unbounded stream query

This closes #12752

[FLINK-18283][API/Core,API/DataStream] Update outdated Javadoc for clear method of ProcessWindowFunction

This closes #12666

This closes #12724.

legacySourceSinks.md

The JVM Direct Memory leak is unlikely in JM. Therefore, we could
disable its limit by default. This way it could span into e.g. JVM
Overhead w/o failure to improve the user experience as before FLIP-116.
If user needs the limit, e.g. to investigate container OOMs, the limit can be enabled by
setting the 'jobmanager.memory.enable-jvm-direct-memory-limit' option.

This closes #12745.

This closes #12749

This closes #12730

This reverts the new added test in JdbcFullTest in "[FLINK-17544][jdbc] Fix NPE and resource leak problem in JdbcOutputFormat".

[FLINK-18403][checkpointing] Ensure that unaligned checkpointing is only activated for EXACTLY_ONCE.

CheckpointConfig#enableUnalignedCheckpoints(boolean) makes it explicit and also is more future-proof. When unaligned checkpoints become the default, this method will be mostly useless and we would need to add a #disableUnalignedCheckpoints() for consistency.

This closes #12733

This closes #12731

This makes it more in line with using JobManager for the other major
component.

This was missed in the recent renaming of Master back to JobManager.

This closes #12725

Before, we used JobManager/Flink Workers, not we use
JobManager/TaskManagers for the section titles.