仅当它在 Pig 中的内部引号（“”）时才替换逗号（，）

Question

我有这样的数据：

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

我想使用 pig 脚本删除 "" 内的空格。这样我的数据将如下所示：

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

我尝试使用 CSVExcelStorage 加载此数据，但我还需要使用 CSVExcelStorage 不支持的“-tagFile”选项。所以我打算只使用 PigStorage，然后替换引号内的任何逗号 (,)。 我坚持这一点。非常感谢任何帮助。谢谢

Answer 1

以下命令会有所帮助：

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：

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

Answer 2

将其加载到单个字段中，然后使用 STRSPLIT 和 REPLACE

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;

一个

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)

E

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

Answer 3

我找到了完美的方法来做到这一点。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;

详细用例可在my blog获取