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Apache Spark: map vs mapPartitions?
... and mapPartitions method?
The method map converts each element of the source RDD into a single element of the result RDD by applying a function. mapPartitions converts each partition of the source RDD into multiple elements of the result (possibly none).
And does flatMap behave like map or li...
Using comparison operators in Scala's pattern matching system
Is it possible to match on a comparison using the pattern matching system in Scala?
For example:
4 Answers
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For loop example in MySQL
In MySQL, I have this stored procedure with a For loop in it:
4 Answers
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How to match any non white space character except a particular one?
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You can use a character class:
/[^\s\\]/
matches anything that is not a whitespace character nor a \. Here's another example:
[abc] means "match a, b or c"; [^abc] means "match any character except a, b or c".
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Merge up to a specific commit
...ave made some extra changes to newbranch and I want to merge newbranch up to the fourth-from-the-last commit to master .
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Is git not case sensitive?
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It will be seen as 2 different things but will cause you issues on a non-case-sensitive system. If this is the case, ensure you are tab-completing any paths or file names. Further, to change the name of something in just the case, do this:
mv file.txt temp.txt
gi...
Converting a column within pandas dataframe from int to string
I have a dataframe in pandas with mixed int and str data columns. I want to concatenate first the columns within the dataframe. To do that I have to convert an int column to str .
I've tried to do as follows:
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Is there “Break on Exception” in IntelliJ?
Is there feature that will automatically break debugging on first exception occurrence?
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Ensuring json keys are lowercase in .NET
Is there simple way using JSON in .NET to ensure that the keys are sent as lower case?
5 Answers
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How do I write data into CSV format as string (not file)?
I want to cast data like [1,2,'a','He said "what do you mean?"'] to a CSV-formatted string.
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