Allow nullable values

native/sql/SqlValues.cpp

@@ -28,7 +28,7 @@ Value::~Value()
 
 value_op_t Value::castString(const std::string & str, SqlType type)
 {
-    assert(!type.nullable);
+    //assert(!type.nullable);
 
     switch (type.typeID) {
         case SqlType::TypeID::UnknownID:
@@ -58,7 +58,7 @@ value_op_t Value::load(const void * ptr, SqlType type)
 {
     if (type.nullable) {
 //        return NullableValue::load(ptr, type);
-        throw NotImplementedException();
+ //       throw NotImplementedException();
     }
 
     switch (type.typeID) {

sql/SqlUtils.cpp

@@ -170,7 +170,7 @@ void genPrintValue(Value & sqlValue)
         }
         nullCheck.Else();
         {
-            genPrintAvailableValue(sqlValue);
+            genPrintAvailableValue(nullableValue.getValue());
         }
         nullCheck.EndIf();
     } else {

tools/semanticalAnalyser/CreateTableAnalyser.cpp

@@ -15,8 +15,6 @@ namespace semanticalAnalysis {
         std::vector<std::string> definedColumnNames;
         std::vector<std::string> typeNames = {"bool","date","integer","longinteger","numeric","char","varchar","timestamp","text"};
         for (auto &column : stmt->columns) {
-            if (column.nullable) throw semantic_sql_error("not supported nullable option at column '" + column.name + "'");
-
             if (std::find(definedColumnNames.begin(),definedColumnNames.end(),column.name) != definedColumnNames.end())
                 throw semantic_sql_error("column '" + column.name + "' already exists");
             definedColumnNames.push_back(column.name);