[SPARK-6459][SQL] Warn when constructing trivially true equals predicate #5163
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Test build #29075 has finished for PR 5163 at commit
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LGTM |
asfgit
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Mar 24, 2015
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")
```
Author: Michael Armbrust <[email protected]>
Closes #5163 from marmbrus/selfJoinError and squashes the following commits:
16c1f0b [Michael Armbrust] fix visibility
1b57e8d [Michael Armbrust] Warn when constructing trivially true equals predicate
(cherry picked from commit 32efadd)
Signed-off-by: Michael Armbrust <[email protected]>
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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.