Modified mapping compiler to write the sample rate to the TimeWindowExpression property of field mappings.

Author: StephenCWills

Source/Libraries/ECAClientUtilities/MappingCompiler.cs

@@ -787,17 +787,20 @@ private void ParseSampleRate(FieldMapping fieldMapping)
 
             // Parse the next token as the sample rate
             fieldMapping.SampleRate = ParseNumber();
+            fieldMapping.TimeWindowExpression += " @ " + fieldMapping.SampleRate;
             SkipWhitespace();
 
             // Parse the "per" keyword
             identifier = ParseIdentifier();
+            fieldMapping.TimeWindowExpression += " " + identifier;
             SkipWhitespace();
 
             if (identifier != "per")
                 RaiseCompileError($"Unexpected identifier: {identifier}. Expected 'per' keyword.");
 
             // Parse the time unit
             identifier = ParseIdentifier();
+            fieldMapping.TimeWindowExpression += " " + identifier;
             fieldMapping.SampleUnit = ToTimeUnit(identifier);
 
             if (fieldMapping.SampleUnit == TimeSpan.Zero)