Lox.NET | A Roslyn inspired for the book Crafting Interpreters | Interpreter library
kandi X-RAY | Lox.NET Summary
kandi X-RAY | Lox.NET Summary
A Roslyn inspired for the book "Crafting Interpreters"
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QUESTION
I have 2 dataframes that look like that
networks
...ANSWER
Answered 2020-May-29 at 16:55This method completely avoids the use of udf
, leveraging split
and slice
, but perhaps there is a better way. The benefit of this approach is that it directly leverages the bits present in the subnet mask and that it's written purely in PySpark
.
Context for the solution: IP addresses can be split and masked by the subnet. This means that 8, 16, 24, 32
tell you which parts of the IP matter - this motivates the division by 8 and using the resulting column to slice the IP address ArrayType
column once it's split from its original StringType
.
NB: pyspark.sql.functions.slice
will work in newer version of PySpark >= 2.4
, some older ones need to use f.expr("slice(...)")
.
The setup:
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