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Constance Wu is calling on Andrew Barth Feldman to take action after his casting in Broadway's "Maybe Happy Ending" sparked controversy ... though, she's doubtful her words will spark action.

If you missed the drama ... Feldman stepped into the lead role of Oliver for the Tony-winning musical this month, taking over for Darren Criss -- who is of Asian descent and originated the part on Broadway. This casting news sent waves throughout the Broadway community, given the role has traditionally been played by Asian actors since its initial conception in South Korea.

Feldman -- who is now starring opposite current girlfriend Helen J. Shen in "Maybe Happy Ending" -- has yet to address the controversy publicly ... though, has seemingly discussed the situation behind closed doors

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