Eyal Allweil created DATAFU-129:
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Summary: New macro - dedup
Key: DATAFU-129
URL: https://issues.apache.org/jira/browse/DATAFU-129
Project: DataFu
Issue Type: New Feature
Reporter: Eyal Allweil
Assignee: Eyal Allweil
Macro used to dedup (de-duplicate) a table, based on a key or keys and an
ordering (typically a date updated field).
One thing to consider - the implementation relies on the
ExtremalTupleByNthField UDF in PiggyBank. I've added it to the test
dependencies in order for the test to run. While I feel that anyone using Pig
typically has PiggyBank in the classpath, this might not be true - do we have
an alternative? (maybe adding it to the jarjar?)
The macro's definition looks as follows:
DEFINE dedup(relation, row_key, order_field) returns out {
relation - relation to dedup
row_key - field(s) for group by
order_field - the field for ordering (to find the most recent record)
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