Upgrade scala 2.12

[maasg]

This PR upgrades the build and the code to compile to Scala 2.12.
The code needed minor changes to disambiguate the SAM type inference.

I hope somebody could help out to support a multi-target build to produce 2.11 (if still needed) and 2.12.

Addresses #321 (but it doesn't preserve support for 2.11)

[msftclas]

All CLA requirements met.

[conorbmurphy]

Has there been any update on this? Spark 3 will likely be released later this month so Scala 2.12 support is crucial

[mpfishe2]

Any updates? Also have projects targeting Spark 3.0 (which is now released) and need Scala 2.12 support. Will this get resolved soon?

[FabianMeiswinkel]

We are planning to release a new version of the CosmosDB Spark connector targeting Spark 3.0 and Scala 2.12 in the second half of this calendar year.

[maasg]

@FabianMeiswinkel I've refreshed the PR and ran all the tests.
The CI seems to have a problem.

The command "~/bin/install-jdk.sh --target "/home/travis/oraclejdk8" --workspace "/home/travis/.cache/install-jdk" --feature "8" --license "BCL"" failed and exited with 56 during .

[FabianMeiswinkel]

@FabianMeiswinkel I've refreshed the PR and ran all the tests.
The CI seems to have a problem.

The command "~/bin/install-jdk.sh --target "/home/travis/oraclejdk8" --workspace "/home/travis/.cache/install-jdk" --feature "8" --license "BCL"" failed and exited with 56 during .

We have no plan of merging this PR into the 2.4 branch because Scala 2.11 and 2.12 aren't binary compatible - we aren't planning on maintaining to official versions of our connector targeting Spark 2.4 - instead we will create a new major version targeting Spark 3.0 and Scala 2.12 - and continue to maintain the one targeting Spark 2.4 and Scala 2.11.

You can of course use private builds based off of this PR for your purposes.

[maasg]

@FabianMeiswinkel Thanks for the info. Would you like me to close this PR or leave it as-is?
I created it b/c some people needed a Scala 2.12 version and I gave them a hand with that but I don't use it myself and might go stale again after a while.

[FabianMeiswinkel]

@maasg - If you don't mind I would keep it open - I think it is a valuable help for anyone who needs to switch to Scala 2.12 even before the new major version of the CosmosDB Spark connector has been released.

[asyncoder]

Spark 3.0 w/ Scala 2.12 has been released but still Cosmos connector supports only Scala 2.11. Any updates please?

[jenden]

Related to #405 - 15+ people asking for this change. Is this still on the roadmap for 2020?

[FabianMeiswinkel]

We are planning to release a Spark 3 compatible connector before April 2021 - preview will start in Deb. 2021.

[SteffenMangold]

We are planning to release a Spark 3 compatible connector before April 2021 - preview will start in Deb. 2021.

Waiting strongly on this preview. Otherwise, we can not use the last DataBricks features. This really blocks us currently.

[duttong13]

Any update on this upgrade? Databricks will EoL support scala 2.11 clusters by July 2021 so we need this upgrade way before then

[EdgeyErn]

Its April 1st, I haven't seen a preview or anything. Any update on this? Really expected more out of Microsoft.

[vinaykv1991]

Any update on this?

We need to have scala 2.12 build in spark 2.4.x