Avoid Spark driver IP binding failure due to VPN setting (#866)

Author: flyrain

regtests/run.sh

@@ -26,6 +26,7 @@ if [ -z "${SPARK_HOME}" ]; then
   export SPARK_HOME=$(realpath ~/${SPARK_DISTRIBUTION})
 fi
 export PYTHONPATH="${SPARK_HOME}/python/:${SPARK_HOME}/python/lib/py4j-0.10.9.7-src.zip:$PYTHONPATH"
+export SPARK_LOCAL_HOSTNAME=localhost # avoid VPN messing up driver local IP address binding
 
 FMT_RED='\033[0;31m'
 FMT_GREEN='\033[0;32m'

regtests/run_spark_sql.sh

@@ -48,6 +48,7 @@ cd ${REGTEST_HOME}
 
 export SPARK_VERSION=spark-3.5.3
 export SPARK_DISTRIBUTION=${SPARK_VERSION}-bin-hadoop3
+export SPARK_LOCAL_HOSTNAME=localhost # avoid VPN messing up driver local IP address binding
 
 ./setup.sh