is currCell->data unique or can we have collisions here?

why do you want to work with a pointer here? You create the map with new in the constructor and never delete it. Just create the map on the stack, which is ok for this use-case, and you don't need to bother with the memory management.

you have quite a lot of parameters already in the constructor. Consider setting the tooltip via setToolTip() function. No need to add yet another empty parameter to the constructor.

Yes, we can have collisions here but this is the best way I could come up yet. Another thing that we can do is to store tooltip with word position (local or global). But the challenge will be to find the position of the word in huge strings.

Ok, It can be done. But I think it will make code unreadable and confusing:
For example this table horizontal header:

rowMajor.append(new Cell("", level, true));
rowMajor.append(new Cell("SS", level, true));
rowMajor.append(new Cell("df", level, true, "degree of freedom");
rowMajor.append(new Cell("MS", level, true));

will get changed to:

rowMajor.append(new Cell("", level, true));
rowMajor.append(new Cell("SS", level, true));
Cell* newCell = new Cell("DF", level, true); newCell->setToolTip("Degree of Freedom"); rowMajor.append(newCell);
rowMajor.append(new Cell("MS", level, true));

You can create in the constructor of the cell and ID, a random number, and work with cell->id() here to avoid collisions.

I don't see this done. It's still a pointer here with the object created with new in the constructor and without any delete in the destructor.

add i18n for this string.

we have already AbstractColumn::isNumeric() returning true for AbstractColumn::Numeric and AbstractColumn::Integer. Please check whether you can use this functions.

No, I don't think that can be done. Because when the user clicks on the word, the information we get is the global position and data of the selected word. While creating the map we didn't know apriori the global position of the word where the tooltip is to be set.

So, to avoid collisions, we have to work on getting the global position of each word apriori.

Ok, I had done removed pointer from tooltips as I also found it unnecessary. Now, for all pointers I created, I have deleted them.

Yes, I am using that only to actually the function definition is:

bool GeneralTest::isNumericOrInteger(const Column* column) {
    return (column->columnMode() == AbstractColumn::Numeric || column->columnMode() == AbstractColumn::Integer);
}

Its is just that this is used many times in code so I wanted to use something short.
Is using macro for this purpose more appropriate?

I didn't refer to the word or to the global position. My suggestion was to create in Cell::Cell() an unique identifier (use a random number maybe) and use it via cell-id() as the key in the map.

What I meant was use QMap<QString, QString> tooltips instead of QMap<QString, QString>* tooltips.

instead of this function you can simply use column->isNumeric().