value = readVariableLiteral(child(modiferTree, 1), ctx);
modifier.set(field, value);
break;
case MqlParser.UNSET:
field = child(modiferTree, 0).getText();
modifier.unset(field);
break;
case MqlParser.PUSH:
field = child(modiferTree, 0).getText();
value = readVariableLiteral(child(modiferTree, 1), ctx);
modifier.push(field, value);