GitHub user marmbrus opened a pull request:
https://github.com/apache/spark/pull/5163
[SPARK-6459][SQL] Warn when constructing trivially true equals predicate
For example, one might expect the following code to work, but it does not.
Now you will at least get a warning with a suggestion to use aliases.
```scala
val df = sqlContext.load(path, "parquet")
val txns = df.groupBy("cust_id").agg($"cust_id",
countDistinct($"day_num").as("txns"))
val spend = df.groupBy("cust_id").agg($"cust_id",
sum($"extended_price").as("spend"))
val rmJoin = txns.join(spend, txns("cust_id") === spend("cust_id"), "inner")
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/marmbrus/spark selfJoinError
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/5163.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 #5163
----
commit 1b57e8da974af5a0497ae4723fde9242446fabf8
Author: Michael Armbrust <[email protected]>
Date: 2015-03-24T08:36:54Z
Warn when constructing trivially true equals predicate
commit 16c1f0b352c7ca3e51fa64f4c08ede23dfcddcbe
Author: Michael Armbrust <[email protected]>
Date: 2015-03-24T08:39:42Z
fix visibility
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