feature: pron (#2908)

* feature: Special dictionary, we can pass with session veriable to modify codepaths and behaviour for testing and debugging

utils/funcexp/func_math.cpp

@@ -25,6 +25,7 @@
 #include <cstdlib>
 #include <string>
 #include <cerrno>
+
 #define _USE_MATH_DEFINES  // MSC: enable math defines
 #include <cmath>
 #include <iomanip>
@@ -45,6 +46,8 @@ using namespace logging;
 
 #include "funchelpers.h"
 
+#include "utils/pron/pron.h"
+
 // Just in case they're missing...
 #ifndef M_LN2
 #define M_LN2 0.69314718055994530942 /* log_e 2 */
@@ -1330,6 +1333,20 @@ CalpontSystemCatalog::ColType Func_sin::operationType(FunctionParm& fp,
 
 double Func_sin::getDoubleVal(Row& row, FunctionParm& parm, bool& isNull, CalpontSystemCatalog::ColType&)
 {
+  auto& pron = utils::Pron::instance();
+  if (pron.pron().count("megasinus") != 0)
+  {
+    try
+    {
+      double fakesin = std::stod(pron.pron().at("megasinus"));
+      return fakesin;
+    }
+    catch (std::exception&)
+    {
+      // do nothing
+    }
+  }
+
   switch (parm[0]->data()->resultType().colDataType)
   {
     case execplan::CalpontSystemCatalog::BIGINT: