OnlyApproximateCsvCountWhenNoFiltersSet.patch

diff --git a/csv/src/main/java/org/apache/metamodel/csv/CsvDataContext.java b/csv/src/main/java/org/apache/metamodel/csv/CsvDataContext.java
index 2b275a9..d8b3269 100644
--- a/csv/src/main/java/org/apache/metamodel/csv/CsvDataContext.java
+++ b/csv/src/main/java/org/apache/metamodel/csv/CsvDataContext.java
@@ -267,6 +267,10 @@ public final class CsvDataContext extends QueryPostprocessDataContext implements
         if (!functionApproximationAllowed) {
             return null;
         }
+        
+        if (whereItems != null && !whereItems.isEmpty()) {
+            return null;
+        }
 
         return _resource.read(new Func<InputStream, Number>() {
             @Override