请尝试以下操作：

A = LOAD 'customer' USING PigStorage('|');
B = DISTINCT A;
A_CLEAN = FILTER B BY NOT(($0 IS NULL) AND ($1 IS NULL) AND ($2 IS NULL));
DUMP A_CLEAN;

这将产生输出：
（8，瑞娜）
(7,ron,ron@.com)
(9,don,dmes@xyz.com)
(10,maya,maya@cnn.com)
(11,marry,mary@.com)
在pig中，不能测试元组的空值。

Tarun, instead AND condition why can't you put OR condition.
        A_CLEAN = FILTER B by ($0 is not null) OR ($1 is not null) OR ($2 is not null);
 This will remove all the null rows and retain if any columns is not empty. 
 Can you try and let me know if this works for your all conditions?

更新：
我不知道为什么isempty（）不为你工作，它为我工作。isempty将只与bag一起工作，因此我将所有字段转换为bag并测试空性。参见下面的工作代码。

input.txt
7|Ron|ron@abc.com
8|Rina
9|Don|dmes@xyz.com
9|Don|dmes@xyz.com
10|Maya|maya@cnn.com

11|marry|mary@abc.com

PigSCript:
A = LOAD 'input.txt' USING PigStorage('|');
B = DISTINCT A;
A_CLEAN = FILTER B BY NOT IsEmpty(TOBAG($0..));
DUMP A_CLEAN;

Output:
(8,Rina  )
(7,Ron,ron@abc.com)
(9,Don,dmes@xyz.com)
(10,Maya,maya@cnn.com)
(11,marry,mary@abc.com)

对于你的另一个问题，这是一个简单的数学计算

In case of AND, 
8|Rina
 will be treated as
 ($0 is not null) AND ($1 is not null) AND ($2 is not null)
 (true) AND (true) AND (false)
 (false) -->so this record will be skipped by Filter command

In case of OR, 
8|Rina
 will be treated as
 ($0 is not null) OR ($1 is not null) OR ($2 is not null)
 (true) OR (true) OR (false)
 (true) -->so this record will be included into the relation by Filter command

In case of empty record, 
<empty record>
  will be treated as
  ($0 is not null) OR ($1 is not null) OR ($2 is not null)
  (false) OR (false) OR (false)
  (false) -->so this record will be skipped by Filter command