GitHub user nchammas opened a pull request:
https://github.com/apache/spark/pull/18926
[SPARK-21712] [PySpark] Clarify type error for Column.substr()
Proposed changes:
* Clarify the type error that `Column.substr()` gives.
Test plan:
* Tested this manually.
* Test code:
```python
from pyspark.sql.functions import col, lit
spark.createDataFrame([['nick']],
schema=['name']).select(col('name').substr(0, lit(1)))
```
* Before:
```
TypeError: Can not mix the type
```
* After:
```
TypeError: startPos and length must be the same type. Got <class 'int'>
and
<class 'pyspark.sql.column.Column'>, respectively.
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/nchammas/spark SPARK-21712-substr-type-error
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18926.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 #18926
----
commit 753dbe1743f552fe7b4867d3e4d24cdcc2ca1669
Author: Nicholas Chammas <[email protected]>
Date: 2017-08-11T18:39:59Z
clarify type error for Column.substr()
----
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