Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18926#discussion_r133116060
--- Diff: python/pyspark/sql/tests.py ---
@@ -1220,6 +1220,13 @@ def test_rand_functions(self):
rndn2 = df.select('key', functions.randn(0)).collect()
self.assertEqual(sorted(rndn1), sorted(rndn2))
+ def test_string_functions(self):
+ from pyspark.sql.functions import col, lit
+ df = self.spark.createDataFrame([['nick']], schema=['name'])
+ self.assertRaises(TypeError, lambda:
df.select(col('name').substr(0, lit(1))))
--- End diff --
How about something like this below as this PR targets the exception
message?
```python
startPos = 0
length = lit(1)
self.assertRaisesRegexp(
TypeError,
"must be the same type.*%s.*%s.*" % (type(startPos), type(length)),
lambda: df.select(col('name').substr(startPos, length)))
```
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