Prevent JVM Segfault (#294)

* testing import order of java

* import dask_cuda before any dask_sql import

* try import for dask_cuda

* try import and noqa for unused import

* fix simple syntax mistake

* formatting issues

* testing for segfaults

* more testing

* replace fix

* noqa F401

* address review comments

* change ordering

Author: jdye64

dask_sql/context.py

@@ -9,6 +9,11 @@
 from dask.base import optimize
 from dask.distributed import Client
 
+try:
+    import dask_cuda  # noqa: F401
+except ImportError:  # pragma: no cover
+    pass
+
 from dask_sql import input_utils
 from dask_sql.datacontainer import (
     UDF,

tests/integration/fixtures.py

@@ -11,6 +11,10 @@
 
 try:
     import cudf
+
+    # importing to check for JVM segfault
+    import dask_cudf  # noqa: F401
+    from dask_cuda import LocalCUDACluster  # noqa: F401
 except ImportError:
     cudf = None