Cheolsoo Park created PIG-3375:
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Summary: CASE does not preserve the order of when branches
Key: PIG-3375
URL: https://issues.apache.org/jira/browse/PIG-3375
Project: Pig
Issue Type: Bug
Reporter: Cheolsoo Park
Assignee: Cheolsoo Park
Fix For: 0.12
Currently CASE expression builds nested BinCond expressions in the following
order: from top to bottom when branches => from in to out bin conds.
This can be confusing if non-mutually exclusive conditions are used in when
branches. For example,
{code}
CASE
WHEN x > 100 THEN 'a'
WHEN x > 50 THEN 'b'
ELSE 'c'
END
{code}
is converted to
{code}
x > 50 ? 'b' : ( x > 100 ? 'a' : 'c' )
{code}
Now if x is 1000, the result is 'b', which is not quite expected.
Instead, we should construct nested BinCond expressions in the same order as
that of when branches, i.e.
{code}
x > 100 ? 'a' : ( x > 50 ? 'b' : 'c' )
{code}
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