[SPARK-20963][SQL] Support column aliases for join relations in FROM clause

[maropu]

What changes were proposed in this pull request?

This pr added parsing rules to support column aliases for join relations in FROM clause.
This pr is a sub-task of #18079.

How was this patch tested?

Added tests in AnalysisSuite, PlanParserSuite, and SQLQueryTestSuite.

[maropu]

In visitTableName in AstBuilder, we already have a different analyzer path to resolve column aliases (https://github.com/maropu/spark/blob/6c93f859b7ef2cc7f7cb49ab6fbd0397b43fda84/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala#L685). We could also use UnresolvedSubqueryColumnAliases along with visitAliasedQuery and visitAliasedRelation though, I'm not sure it is worth fixing so. So, could you give me insight on this, too? Thanks.

[SparkQA]

Test build #80047 has finished for PR 18772 at commit 6c93f85.

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

[maropu]

Jenkins, retest this please.

[SparkQA]

Test build #80049 has finished for PR 18772 at commit 6c93f85.

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

[maropu]

ping

[gatorsmile]

ping me? : )

Will review it in the next few days.

[maropu]

oh, yea. Sorry to forget to add @... ;) Thanks!

[gatorsmile]

#18772 (comment)

This sounds a good idea to me. 👍

[maropu]

ok, I'll fix that way. Is it okay to include the fix in this pr? or, follow-up?

[gatorsmile]

Let us do it in a separate PR. Thanks!

[maropu]

ok. When I finished this pr, I'll do. Thanks!

[gatorsmile]

retest this please

[gatorsmile]

LGTM pending Jenkins.

[SparkQA]

Test build #80290 has finished for PR 18772 at commit 6c93f85.

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

[gatorsmile]

Thanks! Merging to master.

[maropu]

Thanks! I'll make a pr later to fix this as follow-up.