Added prev/next aggregation functions

reconstruct/ast.py

@@ -293,7 +293,7 @@ class projection(ast_node):
                     val[1] = val[1](False)
                 
             if val[0] == LazyT:
-                decltypestring = val[2].eval(x,y,gettype=True,c_code=True)(True)
+                decltypestring = val[2].eval(y=y,gettype=True,c_code=True)(True)
                 decltypestring = f'value_type<decays<decltype({decltypestring})>>'
                 out_typenames[key] = decltypestring
             else:

reconstruct/expr.py

@@ -88,7 +88,7 @@ class expr(ast_node):
         self.udf_map = parent.context.udf_map
         self.func_maps = {**builtin_func, **self.udf_map, **user_module_func}
         self.operators = {**builtin_operators, **self.udf_map, **user_module_func}
-        self.ext_aggfuncs = ['sum', 'avg', 'count', 'min', 'max', 'last', 'first']
+        self.ext_aggfuncs = ['sum', 'avg', 'count', 'min', 'max', 'last', 'first', 'prev', 'next']
         
     def produce(self, node):
         from engine.utils import enlist