Fix: allow single columns or expressions in materialize

vaexio / vaex

Out-of-Core hybrid Apache Arrow/NumPy DataFrame for Python, ML, visualization and exploration of big tabular data at a billion rows per second 🚀

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Fix: allow single columns or expressions in materialize #2249

Closed JovanVeljanoski closed 1 year ago

JovanVeljanoski commented 1 year ago

df.materialize() expects a list of columns / expressions. This PR allows for users to put in a single column/expression. Raised by https://github.com/vaexio/vaex/issues/2247

[x] Update unit-test to expose the issue
[x] Simple fix
[ ] Review