why should we use ‘orderby’ keyword in pig scripts?

 The order statement sorts your data for you, producing a total order of your output data.The syntax of order is similar to group. You indicate a key or set of keys by which you wish to order your data

input2 = load ‘daily’ as (exchanges, stocks);

grpds = order input2 by exchanges;

why should we use ‘filters’ in pig scripts?

Filters are similar to where clause in SQL.filter which contain predicate.If that predicate evaluates to true for a given record, that record will be passed down the pipeline. Otherwise, it will not.predicate contain different operators like ==,>=,<=,!=.so,== and != can be applied to maps and tuples.

A= load ‘inputs’ as(name,address)

B=filter A by symbol matches ‘CM.*’;

What are the different Relational Operators available in pig language?

Relational operators in pig can be categorized into the following list

• Loading and Storing
• Filtering
• Grouping and joining
• Sorting
• Combining and Splitting
• Diagnostic

what are relational operations in pig latin?

they are

1 for each

2 order by

3 filters

4 group

5 distinct

6 join

7 limit

What is grunt shell?

Pig interactive shell is known as Grunt Shell. It provides a shell for users to interact with HDFS.

Does Pig give any warning when there is a type mismatch or missing field?

No, Pig will not show any warning if there is no matching field or a mismatch. If you assume that Pig gives such a warning, then it is difficult to find in log file. If any mismatch is found, it assumes a null value in Pig.

What is the purpose of ‘dump’ keyword in pig?

dump display the output on the screen

dump ‘processed’