fix(csharp/src/Drivers/BigQuery): return null on GetValue exception

csharp/src/Drivers/BigQuery/BigQueryConnection.cs

@@ -85,8 +85,11 @@
             if (!this.properties.TryGetValue(BigQueryParameters.ProjectId, out projectId))
                 throw new ArgumentException($"The {BigQueryParameters.ProjectId} parameter is not present");
 
-            if (this.properties.TryGetValue(BigQueryParameters.AuthenticationType, out authenticationType))
+            if (this.properties.TryGetValue(BigQueryParameters.AuthenticationType, out string? newAuthenticationType))
             {
+                if (!string.IsNullOrEmpty(newAuthenticationType))
+                    authenticationType = newAuthenticationType;
+
                 if (!authenticationType.Equals(BigQueryConstants.UserAuthenticationType, StringComparison.OrdinalIgnoreCase) &&
                     !authenticationType.Equals(BigQueryConstants.ServiceAccountAuthenticationType, StringComparison.OrdinalIgnoreCase))
                 {
@@ -429,7 +432,7 @@
             {
                 bool includeConstraints = true;
 
                 if (this.properties.TryGetValue(BigQueryParameters.IncludeConstraintsWithGetObjects, out string includeConstraintsValue))
                 {
                     bool.TryParse(includeConstraintsValue, out includeConstraints);
                 }
@@ -1023,7 +1026,7 @@
                 Open();
             }
 
             BigQueryStatement statement = new BigQueryStatement(this.client, this.credential);
             statement.Options = ParseOptions();
             return statement;
         }

csharp/src/Drivers/BigQuery/BigQueryStatement.cs

@@ -233,6 +233,9 @@
 
         private Dictionary<String, object> ParseStructArray(StructArray structArray, int index)
         {
+            if (structArray.IsNull(index))
+                return null;
+
             Dictionary<String, object> jsonDictionary = new Dictionary<String, object>();
             StructType structType = (StructType)structArray.Data.DataType;
             for (int i = 0; i < structArray.Data.Children.Length; i++)
@@ -372,7 +375,7 @@
             {
                 if (this.readers == null)
                 {
                     return null;
                 }
 
                 while (true)
@@ -382,7 +385,7 @@
                         if (!this.readers.MoveNext())
                         {
                             Dispose(); // TODO: Remove this line
                             return null;
                         }
                         this.reader = this.readers.Current;
                     }