[SQL] remove unnecessary import in spark-sql

[jackylk]

No description provided.

[AmplabJenkins]

Can one of the admins verify this patch?

[JoshRosen]

Jenkins, this is ok to test.

[SparkQA]

Test build #24212 has started for PR 3630 at commit 150e7e0.

• This patch merges cleanly.

[SparkQA]

Test build #24212 has finished for PR 3630 at commit 150e7e0.

• 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/24212/
Test PASSed.

[JoshRosen]

Jenkins, retest this please.

[SparkQA]

Test build #24233 has started for PR 3630 at commit 150e7e0.

• This patch merges cleanly.

[JoshRosen]

This LGTM, pending Jenkins. I just wanted to retest it to avoid a build-break.

[SparkQA]

Test build #24233 has finished for PR 3630 at commit 150e7e0.

• 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/24233/
Test PASSed.

[JoshRosen]

Alright, merging this into master. Thanks!