[SPARK-11780][SQL] Add catalyst type aliases backwards compatibility

[maropu]

Changed a target at branch-1.6 from #10635.

[SparkQA]

Test build #50070 has finished for PR 10915 at commit 9ef7185.

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

[maropu]

Jenkins, retest this please.

[SparkQA]

Test build #50087 has finished for PR 10915 at commit 9ef7185.

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

[maropu]

Jenkins, retest this please.

[SparkQA]

Test build #50105 has finished for PR 10915 at commit 9ef7185.

• This patch fails to build.
• This patch merges cleanly.
• This patch adds no public classes.

[maropu]

Jenkins, retest this please.

[SparkQA]

Test build #50256 has finished for PR 10915 at commit c338300.

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

[SparkQA]

Test build #50255 has finished for PR 10915 at commit c338300.

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

[maropu]

@marmbrus Okay and could you check this?

[marmbrus]

Thanks, merged to branch-1.6.

[marmbrus]

Can you close this PR now?