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https://issues.apache.org/jira/browse/PIG-2276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13138591#comment-13138591
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Daniel Dai commented on PIG-2276:
---------------------------------
In grammar definition, we separate boolean expression (condition) and
non-boolean (regular) expression. They cannot intermingle other than a few
exception (bincond, eg). Filter only takes condition, and foreach only takes
regular expression. It seems to be unnecessary as boolean is the first class
data type in Pig now (PIG-1429). Some refactory of expression definition is
needed.
> "is null" syntax error with UDF and ternary operator
> ----------------------------------------------------
>
> Key: PIG-2276
> URL: https://issues.apache.org/jira/browse/PIG-2276
> Project: Pig
> Issue Type: Bug
> Components: parser
> Affects Versions: 0.8.0, 0.9.0
> Environment: Debian Squeeze, Mac OS X 10.7.1, java 1.6.0_26,
> Reporter: xvrl
>
> Applying "is null" to the result of a UDF inside the ternary operator gives a
> syntax error:
> A = LOAD 'data.tsv' AS (a, b);
> B = FOREACH A GENERATE ( parseNull(a) is null ? 1 : 0 );
> gives the following error: Syntax error, unexpected symbol at or near
> 'parseNull'
> The same error happens if parseNull is replaced by any other function, e.g.
> (TRIM(a) is null ? 1 : 0) will give the same error message.
> However (a is null ? 1 : 0) and (parseNull(a) == '' ? 1 : 0) gets parsed
> without error, so it is related to the combination of "is null" and the
> result of a UDF.
> Thanks,
> X
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