Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19630
OK, mine was, with this diff:
```diff
---
a/core/src/main/scala/org/apache/spark/api/python/PythonWorkerFactory.scala
+++
b/core/src/main/scala/org/apache/spark/api/python/PythonWorkerFactory.scala
@@ -38,7 +38,7 @@ private[spark] class PythonWorkerFactory(pythonExec:
String, envVars: Map[String
// (pyspark/daemon.py) and tell it to fork new workers for our tasks.
This daemon currently
// only works on UNIX-based systems now because it uses signals for
child management, so we can
// also fall back to launching workers (pyspark/worker.py) directly.
- val useDaemon = !System.getProperty("os.name").startsWith("Windows")
+ val useDaemon = false
var daemon: Process = null
val daemonHost = InetAddress.getByAddress(Array(127, 0, 0, 1))
```
```bash
pip install coverage
# Build Spark (http://spark.apache.org/docs/latest/building-spark.html)
rm python/lib/pyspark.zip
rm -fr .coverage
rm -fr coverage_html
echo "
#!/usr/bin/env bash
coverage run -p \$@
" > coverage_python
chmod 755 coverage_python
PATH=`pwd`:$PATH PYSPARK_PYTHON=coverage_python SPARK_TESTING=1 bin/pyspark
pyspark.sql.tests VectorizedUDFTests
coverage combine
coverage html -d coverage_html -i
open coverage_html
# Open up index.html in your browser.
```
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