仅当逗号(,)在Pig中的内部引号(“”)时才替换逗号(,)

以下命令将有所帮助:

csvFile = load '/path/to/file' using PigStorage(',');
result = foreach csvFile generate $0 as (field1:chararray),$1 as (field2:chararray),CONCAT(REPLACE($2, '\\"', '') , REPLACE($3, '\\"', '')) as field3,$4 as (field4:chararray);

输出:

(1234,john lee,john@xyz.com)

将其加载到单个字段中,然后使用STRSPLIT并替换

A = LOAD 'data.csv' USING TextLoader() AS (line:chararray);
B = FOREACH A GENERATE STRSPLIT(line,'\\"',3); 
C = FOREACH B GENERATE REPLACE($1,',','');
D = FOREACH C GENERATE CONCAT(CONCAT($0,$1),$2); -- You can further use STRSPLIT to get individual fields or just CONCAT
E = FOREACH D GENERATE STRSPLIT(D.$0,',',4);
DUMP E;

A.

1,234,"john, lee", john@xyz.com

B

(1,234,)(john, lee)(, john@xyz.com)

C

(1,234,)(john lee)(, john@xyz.com)

D

(1,234,john lee, john@xyz.com)

(1),(234),(john lee),(john@xyz.com)

我找到了一个完美的方法。一个非常通用的解决方案如下:

data = LOAD 'data.csv' using PigStorage(',','-tagFile') AS (filename:chararray, record:chararray);

/*replace comma(,) if it appears in column content*/
replaceComma = FOREACH data GENERATE filename, REPLACE (record, ',(?!(([^\\"]*\\"){2})*[^\\"]*$)', '');

/*replace the quotes("") which is present around the column if it have comma(,) as its a csv file feature*/
replaceQuotes = FOREACH replaceComma GENERATE filename, REPLACE ($4,'"','') as record;

详细用例见 my blog