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I don’t think the reverse is readily available in q. The md5 encoding is designed to be difficult (not impossible though as hardware develops and new algorithms are found) to reverse, and there won’t be a single answer about the original input.
I assume you have a column of such md5 encoded values stored and you wish to get the original values. Either the original values should also be persisted, or if they are not supposed to be persisted as plain text (say they are passwords), then perhaps we’re not supposed to decode them anyway.