Ian Cook created ARROW-17090:
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Summary: [C++] Add null_if kernel
Key: ARROW-17090
URL: https://issues.apache.org/jira/browse/ARROW-17090
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Ian Cook
Add a binary kernel {{null_if(x, y)}} that returns {{null}} if {{x}} equals
{{y}} , otherwise returns {{x}}.
This function is commonly found in many databases and query engines and is
typically named {{nullif}}. For example:
[PostgreSQL|https://www.postgresql.org/docs/15/functions-conditional.html#FUNCTIONS-NULLIF],
[Impala|https://impala.apache.org/docs/build/html/topics/impala_conditional_functions.html#conditional_functions__nullif],
[Snowflake|https://docs.snowflake.com/en/sql-reference/functions/nullif.html].
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