[SPARK-3853][SQL] JSON Schema support for Timestamp fields

[mtimper]

In JSONRDD.scala, add 'case TimestampType' in the enforceCorrectType function and a toTimestamp function.

[AmplabJenkins]

Can one of the admins verify this patch?

[marmbrus]

ok to test

[marmbrus]

Can you rename this [SPARK-3853][SQL] JSON Schema support for Timestamp fields or something similarly descriptive?

[AmplabJenkins]

Test FAILed.
Refer to this link for build results (access rights to CI server needed):
https://amplab.cs.berkeley.edu/jenkins//job/SparkPullRequestBuilder/21498/Test FAILed.

[SparkQA]

QA tests have started for PR 2720 at commit 9386ab8.

• This patch merges cleanly.

[SparkQA]

QA tests have finished for PR 2720 at commit 9386ab8.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[marmbrus]

Actually one more thing. Will this handle null values? I think you'll get a match error.

[mtimper]

Isn't null being checked for at the beginning enforceCorrectType? Though, I can add it here if you think it is needed.

[marmbrus]

Oh, right. Cool.

[AmplabJenkins]

Can one of the admins verify this patch?

[marmbrus]

Thanks! I've merged this to master.