Revert "[BUILD] Always run SQL tests in master build."

This reverts commit 147b6be.

dev/run-tests

@@ -82,31 +82,24 @@ export SBT_MAVEN_PROFILES_ARGS="$SBT_MAVEN_PROFILES_ARGS -Pkinesis-asl"
 if [ -n "$AMPLAB_JENKINS" ]; then
   git fetch origin master:master
 
-  # AMP_JENKINS_PRB indicates if the current build is a pull request build.
-  if [ -n "$AMP_JENKINS_PRB" ]; then
-    # It is a pull request build.
-    sql_diffs=$(
-      git diff --name-only master \
-      | grep -e "^sql/" -e "^bin/spark-sql" -e "^sbin/start-thriftserver.sh"
-    )
-
-    non_sql_diffs=$(
-      git diff --name-only master \
-      | grep -v -e "^sql/" -e "^bin/spark-sql" -e "^sbin/start-thriftserver.sh"
-    )
-
-    if [ -n "$sql_diffs" ]; then
-      echo "[info] Detected changes in SQL. Will run Hive test suite."
-      _RUN_SQL_TESTS=true
-
-      if [ -z "$non_sql_diffs" ]; then
-        echo "[info] Detected no changes except in SQL. Will only run SQL tests."
-        _SQL_TESTS_ONLY=true
-      fi
-    fi
-  else
-    # It is a regular build. We should run SQL tests.
+  sql_diffs=$(
+    git diff --name-only master \
+    | grep -e "^sql/" -e "^bin/spark-sql" -e "^sbin/start-thriftserver.sh"
+  )
+
+  non_sql_diffs=$(
+    git diff --name-only master \
+    | grep -v -e "^sql/" -e "^bin/spark-sql" -e "^sbin/start-thriftserver.sh"
+  )
+
+  if [ -n "$sql_diffs" ]; then
+    echo "[info] Detected changes in SQL. Will run Hive test suite."
     _RUN_SQL_TESTS=true
+
+    if [ -z "$non_sql_diffs" ]; then
+      echo "[info] Detected no changes except in SQL. Will only run SQL tests."
+      _SQL_TESTS_ONLY=true
+    fi
   fi
 fi
 

dev/run-tests-jenkins

@@ -185,8 +185,6 @@ done
 
 # run tests
 {
-  # Marks this build is a pull request build.
-  export AMP_JENKINS_PRB=true
   timeout "${TESTS_TIMEOUT}" ./dev/run-tests
   test_result="$?"