DPL Analysis: add protect0 node for preventing division by 0 in expressions (#14338)

Author: aalkin

Framework/Core/include/Framework/Expressions.h

@@ -17,6 +17,7 @@
 #include "Framework/Variant.h"
 #include "Framework/InitContext.h"
 #include "Framework/ConfigParamRegistry.h"
+#include "CommonConstants/MathConstants.h"
 #include <arrow/type_fwd.h>
 #include <gandiva/gandiva_aliases.h>
 #include <arrow/type.h>
@@ -554,6 +555,13 @@ inline Node clamp(Node&& expr, T low, T hi)
   return ifnode(Node{copy} < LiteralNode{low}, LiteralNode{low}, ifnode(Node{copy} > LiteralNode{hi}, LiteralNode{hi}, Node{copy}));
 }
 
+/// division by 0 protector
+inline Node protect0(Node&& expr)
+{
+  auto copy = expr;
+  return ifnode(nabs(Node{copy}) < o2::constants::math::Almost0, o2::constants::math::Almost0, Node{copy});
+}
+
 /// A struct, containing the root of the expression tree
 struct Filter {
   Filter() = default;