This closes #12907

This closes #12140

This closes #12010

This closes #11944

It adds CsvRowSerializationSchema, CsvRowDeserializationSchema, a new CSV descriptor,
CsvRowTableFormatFactory, documentation and tests

The format integrates nicely with most SQL types.

It deprecates the "old CSV" descriptor stack and prepares also for FLINK-7050 (#4660).

The old CSV descriptor is still available under as "OldCsv".

This closes #7777.

This commit splits the flink-table module into multiple submodules in
accordance with FLIP-32 (step 1).

The new module structure looks as follows:

flink-table-common
       ^
       |
flink-table-api-java <------- flink-table-api-scala
       ^                                 ^
       |                                 |
flink-table-api-java-bridge    flink-table-api-scala-bridge
       ^
       |
flink-table-planner

The module structure assumes that the type system has been reworked such
that only one table environment exists for both Java and Scala users.

The module `flink-table-planner` contains the content of the old
`flink-table` module. From there we can distribute ported classes to
their final module without breaking backwards compatibility or
force users to update their dependencies again.

For example, if a user wants to implement a pure table program in Scala,
`flink-table-api-scala` and `flink-table-planner` need to be
added to the project.

Until we support pure table programs, `flink-table-api-scala/java-bridge`
and `flink-table-planner` need to be added to the project.

This closes #7587.

This changes some modules that had a _2.11 dependency but didn't expose
it in their module name to instead depend on the ${scala.binary.version}
dependency.

The main reason for this is to make the build self contained, before,
with the hard-dependency on 2.11, when buildig for 2.12 it would not be
clear where the dependency would come from because it is not created as
part of the build. This could lead to inconsistencies. For example, when
adding a new class in flink-runtime but not recompiling on 2.11 but only
on 2.12, the 2.12 tests would fail when using that new class because
they would use 2.11 dependencies that weren't rebuilt with the new
class.

We also don't build flink-scala-shell and flink-connector-kafka-0.8
because they don't work with Scala 2.12.

This also includes $PROFILE in dependency convergence check script. This
is in preparation for building with "-Dscala-212", where we hace to
exclude certain things.

We also exclude Kafka 0.8 from stages when building for Scala 2.12

And add Scala 2.12 to the release scripts

This commit makes the flink-formats module Scala free by introducing a
flink-table-common module that is implemented in Java. This module contains
all classes that are required across different Maven modules.

Additionally, all classes in this module have been annotated with @Internal
and @PublicEvolving accordingly.

Since the methods in Descriptor were declared with private[flink] visibility,
they have been migrated to a new toProperties() method that is public.

This closes #6958.

This closes #6366.

This closes #5840.

This closes #5700.

This closes #5564.

This closes #5491.

The QS module is split into core and client. The core should
be put in the lib folder to enable queryable state, while the
client is the one that the user will program against. The
reason for the restructuring in mainly to remove the dependency
on the flink-runtime from the user's program.

This closes #4661.

Use scala.binary.version as defined in the parent POM and remove the
script to swap scala version identifiers.

This closes #3800

This closes #2418.

This closes #2324

- moved user-facing API to 'flink-metrics/flink-metrics-core'
- moved JMXReporter to 'flink-metrics/flink-metrics-jmx'
- moved remaining metric classes to 'flink-runtime'

This closes #2226

This closes #2148

This closes #2112

  - Metric groups are generally thread-safe
  - Metric groups are closable. Closed groups do not register metric objects and more.
  - TaskManager's JobMetricsGroup auto disposes when all TaskMetricGroups are closed
  - Maven project with metric reporters renamed to 'flink-metric-reporters'
  - Various code style cleanups

- add suffixes
- adapt change-scala-version script

This closes #1529.

[FLINK-3246] Remove unnecessary '-parent' suffix from projects 'flink-contrib' and 'flink-streaming-connectors'.

This closes #1515