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Removing duplicate columns after a DF join in Spark df join(other, on, how) when on is a column name string, or a list of column names strings, the returned dataframe will prevent duplicate columns when on is a join expression, it will result in duplicate columns We can use drop(df a) to drop duplicate columns Example: cond = [df a == other a, df b == other bb, df c == other ccc] # result will have duplicate column a result = df join(other
XML document cannot contain multiple root level elements I have a list of codes to which i have an error "XML document cannot contain multiple root level elements" <Employee> <Name ID= "JanRich">Janice Richardson< Name> <Role>
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How to split an email address into its parts before and after dot (. ) You'll need to complete a few actions and gain 15 reputation points before being able to upvote Upvoting indicates when questions and answers are useful What's reputation and how do I get it? Instead, you can save this post to reference later
React doesnt rerender on an array state update - Stack Overflow react uses "shallow" comparison of state and props to determine if the component must rerender Arrays are reference types When using const arr = anchors, and then setting state to arr, its the same reference to that array, thus it wont rerender using the spread operator, const arr = [ anchors], causes arr to have a different reference to anchors Then, when setting state to that array
Python - cant import Set from sets (no module named sets) I would highly recommend never copying around python standard modules between different versions into their own standard lib locations If you start to do that, you have to imagine you must be doing something wrong The std libs installs dont need user maintenance
bash - How can I make a linux command wait for the end of input before . . . Paul Janice This works, but is a little bit cumbersome Are there any built-in commands that basically "hold" the stream until it is over (or rather, don't print anything until all input has been processed)? Or ways to simply suppress seeing stdin? I could also use temp files, but I'd like to have a "clean 1 step no overhead" way of doing it