Merge pull request #42 from sidhant92/array_math_functions

fix cache key

Author: sidhant92

src/main/java/com/github/sidhant92/boolparser/parser/antlr/CachedBoolParser.java

@@ -27,6 +27,6 @@ public Try<Node> parseExpression(final String expression) {
 
     private Node getNode(final String expression, final String defaultField) {
         final String cacheKey = expression + "_" + Optional.ofNullable(defaultField).orElse("");
-        return cache.get(cacheKey, ex -> super.parse(ex, defaultField));
+        return cache.get(cacheKey, ex -> super.parse(expression, defaultField));
     }
 }