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Apache Pig Eval function

May 26, 2021 Apache Pig

Table of contents

1. The Eval function

Apache Pig offers a variety of built-in functions, namely eval, load, store, math, string, bag, and tuple functions.

The Eval function

Here's a list of the eval functions provided by Apache Pig.

S.N.	Functions and descriptions
1	AVG() Calculates the average of the values in the package.
2	BagToString() Connect the elements of the package into strings. /b10> When connecting, we can place separators (optional) between these values.
3	CONCAT() Connect two or more expressions of the same type.
4	COUNT() Gets the number of elements in the package and calculates the number of yuan in the package.
5	COUNT_STAR() It is similar to the COUNT() function. /b10> It is used to get the number of elements in the package.
6	DIFF() Compare the two packages (fields) in the metagroup.
7	IsEmpty() Check that the package or map is empty.
8	MAX() Calculates the maximum value of a column (value or character) in a single column package.
9	MIN() To get the minimum (minimum) value (number or character) for a particular column in a single column package.
10	PluckTuple() Using Pig Latin's PluckTuple() function, you can define the string Prefix and filter the columns in the relationship that begin with a given prefix.
11	SIZE() The number of elements is calculated based on any Pig data type.
12	SUBTRACT() The two packages subtract, it takes two packages as input, and returns a package that contains the groups that are not in the second package in the first package.
13	SUM() To get the sum of the values for a column in a single column package.
14	TOKENIZE() To split a string in a single group that contains a set of words and return a package that contains the output of the split operation.