[SPARK-4825] [SQL] CTAS fails to resolve when created using saveAsTable

[chenghao-intel]

Fix bug when query like:

  test("save join to table") {
    val testData = sparkContext.parallelize(1 to 10).map(i => TestData(i, i.toString))
    sql("CREATE TABLE test1 (key INT, value STRING)")
    testData.insertInto("test1")
    sql("CREATE TABLE test2 (key INT, value STRING)")
    testData.insertInto("test2")
    testData.insertInto("test2")
    sql("SELECT COUNT(a.value) FROM test1 a JOIN test2 b ON a.key = b.key").saveAsTable("test")
    checkAnswer(
      table("test"),
      sql("SELECT COUNT(a.value) FROM test1 a JOIN test2 b ON a.key = b.key").collect().toSeq)
  }

[chenghao-intel]

test this please

[SparkQA]

Test build #24353 has started for PR 3673 at commit e004895.

• This patch merges cleanly.

[SparkQA]

Test build #24354 has started for PR 3673 at commit e004895.

• This patch merges cleanly.

[SparkQA]

Test build #24354 has finished for PR 3673 at commit e004895.

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

[AmplabJenkins]

Test FAILed.
Refer to this link for build results (access rights to CI server needed):
https://amplab.cs.berkeley.edu/jenkins//job/SparkPullRequestBuilder/24354/
Test FAILed.

[SparkQA]

Test build #24353 has finished for PR 3673 at commit e004895.

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

[AmplabJenkins]

Test FAILed.
Refer to this link for build results (access rights to CI server needed):
https://amplab.cs.berkeley.edu/jenkins//job/SparkPullRequestBuilder/24353/
Test FAILed.

[SparkQA]

Test build #24359 has started for PR 3673 at commit e8cbd56.

• This patch merges cleanly.

[SparkQA]

Test build #24359 has finished for PR 3673 at commit e8cbd56.

• 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/24359/
Test PASSed.

[chenghao-intel]

@marmbrus Any comment on this? This is a blocker fixing.

[marmbrus]

Thanks for the fast fix! Merged to master and 1.2