Add spark mapstate

[twosom]

Please add a meaningful description for your change here

fixes #31668

This PR contains theses change

• add isEmpty test in StateInternalsTest#testMap
• add map state in SparkRunner

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[twosom]

retest this please

[chamikaramj]

assign set of reviewers

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[Abacn]

Thanks for the contribution. Could you please update the comments of the test class here

beam/runners/spark/src/test/java/org/apache/beam/runners/spark/stateful/SparkStateInternalsTest.java

Line 27 in 54a1538

* Tests for {@link SparkStateInternals}. This is based on {@link StateInternalsTest}. Ignore set

now it no longer ignores map tests

[twosom]

Thanks for the contribution. Could you please update the comments of the test class here

beam/runners/spark/src/test/java/org/apache/beam/runners/spark/stateful/SparkStateInternalsTest.java

Line 27 in 54a1538

* Tests for {@link SparkStateInternals}. This is based on {@link StateInternalsTest}. Ignore set

now it no longer ignores map tests

I hadn't seen that comment, thanks!

[Abacn]

thanks, just have a minor comment

when pushing changes, please do not force push and just push a new commit instead, so reviewer can track diff

[Abacn]

use assertFalse / assertTrue?

[twosom]

check!

[twosom]

thanks, just have a minor comment

when pushing changes, please do not force push and just push a new commit instead, so reviewer can track diff

Got it! I'll make sure to push new commits from now on, instead of force-pushing. Thanks so much!