julianhyde commented on code in PR #3915:
URL: https://github.com/apache/calcite/pull/3915#discussion_r1719223113


##########
testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java:
##########
@@ -13824,6 +13824,54 @@ void testTimestampDiff(boolean coercionEnabled) {
     f.checkNull("date_add(CAST(NULL AS DATE), interval 5 day)");
   }
 
+  /** Test case for
+   * <a 
href="https://issues.apache.org/jira/browse/CALCITE-6527";>[CALCITE-6527]
+   * Add DATE_ADD function (enabled in Spark library)</a>.
+   */
+  @Test void testDateAddSpark() {
+    final SqlOperatorFixture f0 = fixture()
+        .setFor(SqlLibraryOperators.DATE_ADD_SPARK);
+    f0.checkFails("^date_add(date '2008-12-25', "
+            + "5)^",
+        "No match found for function signature "
+            + "DATE_ADD\\(<DATE>, <NUMERIC>\\)", false);
+
+    final SqlOperatorFixture f = f0.withLibrary(SqlLibrary.SPARK);
+    f.checkScalar("date_add(date '2016-02-22', 2)",
+        "2016-02-24",
+        "DATE NOT NULL");
+    f.checkScalar("date_add(date '2016-02-28', 2)",
+        "2016-03-01",
+        "DATE NOT NULL");
+    f.checkScalar("date_add(date '2016-03-01', -2)",
+        "2016-02-28",
+        "DATE NOT NULL");
+    f.checkScalar("date_add(date '2016-03-01', -2)",
+        "2016-02-28",
+        "DATE NOT NULL");
+    f.checkScalar("date_add(date '2016-03-01', -2.0)",
+        "2016-02-28",
+        "DATE NOT NULL");
+    f.checkScalar("date_add(date '2016-02-28', 2.0)",
+        "2016-03-01",
+        "DATE NOT NULL");
+    f.checkScalar("date_add(date '2016-02-28', '2.0')",
+        "2016-03-01",
+        "DATE NOT NULL");
+    f.checkScalar("date_add(timestamp '2016-02-22 13:00:01', '-2.0')",
+        "2016-02-20",
+        "DATE NOT NULL");
+    f.checkScalar("date_add(timestamp '2016-02-22 13:00:01', -2)",
+        "2016-02-20",
+        "DATE NOT NULL");
+    f.checkScalar("date_add(timestamp '2016-02-22 13:00:01', -2.0)",
+        "2016-02-20",
+        "DATE NOT NULL");
+    f.checkNull("date_add(CAST(NULL AS DATE), 5)");
+    f.checkNull("date_add(date '2016-02-22', CAST(NULL AS INTEGER))");

Review Comment:
   @mihaibudiu, I don't recall. I just happened to reading about ISO-8601 so I 
thought I'd correct misinformation.



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