Ian Cook created ARROW-13136:
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Summary: [C++] Add a "coalesce" variadic scalar kernel
Key: ARROW-13136
URL: https://issues.apache.org/jira/browse/ARROW-13136
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Ian Cook
Add a variadic scalar compute kernel that works like the SQL {{coalesce}}
function. It should take arbitrarily many inputs of the same or compatible
types and process them row-wise, returning the first non-null value in each
row, or returning {{null}} if there are no non-null values in the row.
For example, in the case of 3 integer-type input arrays, this would take inputs:
{code:java}
Array<int32> Array<int32> Array<int32>
[ [ [
null, 2, 3,
4, null, 6,
null, null, 9,
null null null
] ] ]
{code}
and return output:
{code:java}
Array<int32>
[
2,
4,
9,
null
]
{code}
This should also accept scalar values and recycle their values.
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