GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/14397
[SPARK-16771][SQL] WITH clause should not fall into infinite loop.
## What changes were proposed in this pull request?
This PR changes the table resolving rule to use database tables before CTE
tables in order to prevent infinite loops on CTE table name resolution.
**Reported Error Scenarios**
```scala
scala> spark.range(10).createOrReplaceTempView("t")
scala> sql("WITH t AS (SELECT 1 FROM t) SELECT * FROM t")
java.lang.StackOverflowError
...
```
```scala
scala> spark.range(10).createOrReplaceTempView("t1")
scala> spark.range(10).createOrReplaceTempView("t2")
scala> sql("WITH t1 AS (SELECT 1 FROM t2), t2 AS (SELECT 1 FROM t1) SELECT
* FROM t1, t2")
java.lang.StackOverflowError
...
```
## How was this patch tested?
Pass the Jenkins tests with new two testcases.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-16771-TREENODE
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14397.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #14397
----
commit 5bca528d971cad317f748cb3f2d050ce0b8f99a7
Author: Dongjoon Hyun <dongj...@apache.org>
Date: 2016-07-29T04:41:20Z
[SPARK-16771][SQL] WITH clause should not fall into infinite loop.
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