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What is Bag & Tuple Functions in Apache Pig ?
- Tuple: A tuple is a set of fields. Here Id and product_name form a tuple. Tuples are represented by braces. Example: (10, iphone).
- enclosed by (), items separated by ","
- Non-empty tuple: (item1,item2,item3)
- Empty tuple is valid: ()
- Bag: A bag is collection of tuples. Bag is represented by flower braces. Exa enclosed by (), items separated by ","
- enclosed by {}, tuples separated by ","
- Non-empty bag: {code}{(tuple1),(tuple2),(tuple3)}{code}
- Empty bag is valid: {}
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- The list of Bag and Tuple functions.
| S.no | Syntax | Functions & Description |
|---|---|---|
| 1 | TOBAG (expression [, expression …]) | TOBAG() To convert two or more expressions intoa bag. |
| 2 | TOP (topN,column,relation) | TOP() To get the top N tuples of a relation. |
| 3 | TOTUPLE (expression [, expression …]) | TOTUPLE() To convert one or more expressions into a tuple. |
| 4 | TOMAP (key-expression, value-expression [, key-expression, value-expression …]) | TOMAP()To convert the key-value pairs into a Map. |