[Solved-1 Solution] How to handle recursive hierarchy in pig ?
What is recursive function
- A recursive function (DEF) is a function which either calls itself or is in a potential cycle of function calls. As the definition specifies, there are two types of recursive functions. Consider a function which calls itself: we call this type of recursion immediate recursion.
- This below model have unbalanced tree data stored in tabular format like:
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- How to flatten this hierarchy where each row contains entire path from leaf node to root node in a row as:
How to solve above problem using hive, pig or mapreduce?
Here is the sample code to handle recursive hierarchy in pig
- A Join simply brings together two data sets. These joins can happen in different ways in Pig - inner, outer, right, left, and outer joins. These however are simple joins and there are specialized joins supported byPig.
Using join is one of the way to handle this function