[SYSTEMDS-3765] Reproducible test case for the need of time() hoisting

src/test/java/org/apache/sysds/test/functions/rewrite/RewriteHoistingTimeTest.java

@@ -0,0 +1,71 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.sysds.test.functions.rewrite;
+
+import org.junit.Test;
+import org.apache.sysds.common.Types.ExecMode;
+import org.apache.sysds.common.Types.ExecType;
+import org.apache.sysds.test.AutomatedTestBase;
+import org.apache.sysds.test.TestConfiguration;
+import org.apache.sysds.test.TestUtils;
+
+public class RewriteHoistingTimeTest extends AutomatedTestBase
+{
+	private static final String TEST_NAME1 = "RewriteTimeHoisting";
+
+	private static final String TEST_DIR = "functions/rewrite/";
+	private static final String TEST_CLASS_DIR = TEST_DIR + RewriteHoistingTimeTest.class.getSimpleName() + "/";
+
+	private static final int rows = 1001;
+	private static final int cols = 1002;
+
+	@Override
+	public void setUp() {
+		TestUtils.clearAssertionInformation();
+		addTestConfiguration( TEST_NAME1, new TestConfiguration(TEST_CLASS_DIR, TEST_NAME1, new String[] {"R"}) );
+	}
+
+	@Test
+	public void testTimeHoisting() {
+		test(TEST_NAME1, ExecType.CP);
+	}
+
+	private void test(String testname, ExecType et)
+	{
+		ExecMode platformOld = setExecMode(et);
+
+		try
+		{
+			TestConfiguration config = getTestConfiguration(testname);
+			loadTestConfiguration(config);
+
+			String HOME = SCRIPT_DIR + TEST_DIR;
+			fullDMLScriptName = HOME + testname + ".dml";
+			programArgs = new String[] { "-explain", "-args",
+				String.valueOf(rows), String.valueOf(cols) };
+
+			//FIXME need to hoist time() out of expression similar to function calls
+			runTest(true, false, null, -1); 
+		}
+		finally {
+			resetExecMode(platformOld);
+		}
+	}
+}

src/test/scripts/functions/rewrite/RewriteTimeHoisting.dml

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+#-------------------------------------------------------------
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+#-------------------------------------------------------------
+
+t1 = time();
+X = rand(rows=$1, cols=$2);
+
+print("time = "+(time()-t1)/1e9+"s"+" "+sum(X));
+