Implement FILTER-clause for aggregate functions
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Key: CORE-5768
URL: http://tracker.firebirdsql.org/browse/CORE-5768
Project: Firebird Core
Issue Type: New Feature
Components: Engine
Reporter: Mark Rotteveel
Implement FILTER-clause for aggregate functions (introduced in SQL:2003). This
syntax allows for filtering before aggregation.
Basic example:
SUM(<expression>) FILTER(WHERE <condition>)
or with window functions:
SUM(<expression>) FILTER(WHERE <condition>) OVER (<window>)
Workarounds/alternative: use a CASE-expression within the aggregate function.
See also SQL:2016 10.9 <aggregate function> and
https://modern-sql.com/feature/filter
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