[SPARK-35937][SQL] Extracting date field from timestamp should work in ANSI mode

[gengliangwang]

What changes were proposed in this pull request?

Add a new ANSI type coercion rule: when getting a date field from a Timestamp column, cast the column as Date type.

This is Spark's current hack to make the implementation simple. In the default type coercion rules, the implicit cast rule does the work. However, The ANSI implicit cast rule doesn't allow converting Timestamp type as Date type, so we need to have this additional rule to make sure the date field extraction from Timestamp columns works.

Why are the changes needed?

Fix a bug.

Does this PR introduce any user-facing change?

No, the new type coercion rules are not released yet.

How was this patch tested?

Unit test

[SparkQA]

Test build #140354 has finished for PR 33138 at commit 94cf53f.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Kubernetes integration test starting
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/44938/

[gengliangwang]

Merging to master

[SparkQA]

Kubernetes integration test status success
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/44938/

[SparkQA]

Test build #140423 has finished for PR 33138 at commit 08806cc.

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