fix external procs

Author: James Cor

sql/rowexec/rel.go

@@ -730,12 +730,17 @@ func (b *BaseBuilder) buildExternalProcedure(ctx *sql.Context, n *plan.ExternalP
 	}
 	for i, paramDefinition := range n.ParamDefinitions {
 		if paramDefinition.Direction == plan.ProcedureParamDirection_Inout || paramDefinition.Direction == plan.ProcedureParamDirection_Out {
+			// TODO: not sure if we should still be doing this
 			exprParam := n.Params[i]
 			funcParamVal := funcParams[i+1].Elem().Interface()
 			err := exprParam.Set(funcParamVal, exprParam.Type())
 			if err != nil {
 				return nil, err
 			}
+			err = ctx.Session.SetStoredProcParam(exprParam.Name(), funcParamVal)
+			if err != nil {
+				return nil, err
+			}
 		}
 	}
 	// It's not invalid to return a nil RowIter, as having no rows to return is expected of many stored procedures.