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https://issues.apache.org/jira/browse/DATAFU-69?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130913#comment-14130913
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Russell Jurney commented on DATAFU-69:
--------------------------------------
Example use:
group_fields = LOAD '/e8/smalldata/group_fields.txt' AS (groupField:chararray);
with_group = CROSS group_fields, hour_rounded;
with_group = FOREACH with_group GENERATE group_fields::groupField AS
groupField,
hour_rounded::sourceNameOrIp AS
sourceNameOrIp,
hour_rounded::destinationNameOrIp AS
destinationNameOrIp,
...;
with_value_substitution = FOREACH with_group GENERATE
ChooseFieldByValue(groupField, *) AS groupValue:tuple(value:chararray), *;
with_value_substitution = FOREACH with_value_substitution GENERATE
FLATTEN(groupValue) AS groupValue:chararray,
groupField,
foo,
bar,
...
all_success = FOREACH (GROUP with_value_substitution BY (groupField,
groupValue, day)) GENERATE
FLATTEN(group) AS (seriesType, groupValue, day),
(int)COUNT_STAR(with_value_substitution) AS connections:int;
> Create ChooseFieldByValue UDF - which, given a field who's value contains a
> field name, and *, returns the value of the field referenced by the field name
> ----------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: DATAFU-69
> URL: https://issues.apache.org/jira/browse/DATAFU-69
> Project: DataFu
> Issue Type: Bug
> Affects Versions: 1.3.0
> Reporter: Russell Jurney
> Labels: features
> Attachments: DATAFU-69.patch
>
>
> define ChooseFieldByValue datafu.pig.util.ChooseFieldByValue();
> data = LOAD 'input' using PigStorage(',') AS (fieldName:chararray,
> text1:chararray, text2:chararray, text3:chararray);
> data2 = FOREACH data GENERATE fieldName, ChooseFieldByValue(fieldName,*) as
> result;
> data3 = FOREACH data2 GENERATE fieldName, result;
> STORE data3 INTO 'output';
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