Add code to handle double NaN, +- inf to Monitor (Azure#25096)

Author: nisha-bhatia

sdk/monitor/Azure.Monitor.Query/CHANGELOG.md

@@ -7,6 +7,7 @@
 ### Breaking Changes
 
 ### Bugs Fixed
+- NaN, +inf, and -inf double values can now be retrieved from `LogsQueryResult`
 
 ### Other Changes
 

sdk/monitor/Azure.Monitor.Query/src/Models/LogsTableRow.cs

@@ -65,7 +65,29 @@ internal LogsTableRow(Dictionary<string, int> columnMap, IReadOnlyList<LogsTable
         /// </summary>
         /// <param name="index">The column index.</param>
         /// <returns>The <see cref="Nullable{Double}"/> value of the column.</returns>
-        public double? GetDouble(int index) => _row[index].ValueKind == JsonValueKind.Null ? null : _row[index].GetDouble();
+        public double? GetDouble(int index)
+        {
+            if (_row[index].ValueKind == JsonValueKind.Null)
+            {
+                return null;
+            }
+            else
+            {
+                if (_row[index].ValueKind == JsonValueKind.String)
+                {
+                    string result = _row[index].GetString();
+                    switch (result) {
+                        case "NaN":
+                            return Double.NaN;
+                        case "Infinity":
+                            return Double.PositiveInfinity;
+                        case "-Infinity":
+                            return Double.NegativeInfinity;
+                    }
+                }
+                return _row[index].GetDouble();
+            }
+        }
 
         /// <summary>
         /// Gets the value of the column at the specified index as <see cref="string"/>.

sdk/monitor/Azure.Monitor.Query/tests/LogsQueryClientClientLiveTests.cs

@@ -753,5 +753,22 @@ private record TestModelForTypesNullable
             public Decimal? Decimal { get; set; }
             public BinaryData Dynamic { get; set; }
         }
+
+        [Test]
+        public async Task ValidateNanAndInfResultsDoubleAsync()
+        {
+            var client = CreateClient();
+            var results = await client.QueryWorkspaceAsync(TestEnvironment.WorkspaceId, "print real(nan), real(+inf), real(-inf), real(null), real(123)", TimeSpan.FromMinutes(1));
+
+            var resultTable = results.Value.Table;
+            CollectionAssert.IsNotEmpty(resultTable.Columns);
+
+            Assert.AreEqual(LogsQueryResultStatus.Success, results.Value.Status);
+            Assert.AreEqual(double.NaN, resultTable.Rows[0][0]);
+            Assert.AreEqual(double.PositiveInfinity, resultTable.Rows[0][1]);
+            Assert.AreEqual(double.NegativeInfinity, resultTable.Rows[0][2]);
+            Assert.AreEqual(null, resultTable.Rows[0][3]);
+            Assert.AreEqual(123, resultTable.Rows[0][4]);
+        }
     }
 }