[SPARK-3892][SQL] remove redundant type name

[adrian-wang]

No description provided.

[AmplabJenkins]

Can one of the admins verify this patch?

[SparkQA]

QA tests have started for PR 2747 at commit fbaf340.

• This patch merges cleanly.

[SparkQA]

QA tests have finished for PR 2747 at commit fbaf340.

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

[AmplabJenkins]

Test PASSed.
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[liancheng]

I tend to just remove this method since it's not used anywhere. Another important reason is that the DataType class hierarchy is now part of the public API, which should be minimized for safe :)

[liancheng]

To be honest, this method is there totally because I forgot to remove it... Otherwise at least object ArrayType and object StructType should have their own versions of typeName.

[adrian-wang]

Actually they do have... should I remove them?

[liancheng]

Yea, please go ahead :)

[SparkQA]

QA tests have started for PR 2747 at commit 2824216.

• This patch merges cleanly.

[SparkQA]

QA tests have finished for PR 2747 at commit 2824216.

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

[AmplabJenkins]

Test PASSed.
Refer to this link for build results (access rights to CI server needed):
https://amplab.cs.berkeley.edu/jenkins//job/SparkPullRequestBuilder/21613/Test PASSed.

[liancheng]

This LGTM. Please rename the PR title to reflect the actual changes.

[marmbrus]

Thanks! Merged to master.