GitHub user aokolnychyi opened a pull request:
https://github.com/apache/spark/pull/18740
[SPARK-21538][SQL] Attribute resolution inconsistency in the Dataset API
## What changes were proposed in this pull request?
This PR contains a tiny update that removes an attribute resolution
inconsistency in the Dataset API. The following example is taken from the
ticket description:
```
spark.range(1).withColumnRenamed("id", "x").sort(col("id")) // works
spark.range(1).withColumnRenamed("id", "x").sort($"id") // works
spark.range(1).withColumnRenamed("id", "x").sort('id) // works
spark.range(1).withColumnRenamed("id", "x").sort("id") // fails with:
org.apache.spark.sql.AnalysisException: Cannot resolve column name "id"
among (x);
```
The above `AnalysisException` happens because the last case calls
`Dataset.apply()` to convert strings into columns, which triggers attribute
resolution. To make the API consistent between overloaded methods, this PR
delays the resolution and constructs columns directly.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/aokolnychyi/spark spark-21538
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18740.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 #18740
----
commit b0fbd5ee98de0ed725d96e63943da934150f6c3e
Author: aokolnychyi <[email protected]>
Date: 2017-07-26T19:56:44Z
[SPARK-21538][SQL] Fix attribute resolution inconsistency in the Dataset API
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