STRING_AGG missing functionality #14412
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This was referenced Feb 15, 2025
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Which issue does this PR close?
distinctandorder byclause forstring_aggaggregate function #8260.Rationale for this change
See #14413 first.
Complete the missing functionality of the STRING_AGG function.
What changes are included in this PR?
Adds support for DISTINCT and ORDER_BY clauses by reusing the existing ARRAY_AGG functionality and building the whole STRING_AGG aggregation function on top of it. This way, the full STRING_AGG functionality is automatically implemented [almost] for free.
The rationale for reusing the ARRAY_AGG functionality is because both functions are very similar, with just two minor diferences:
In order to have the full STRING_AGG functionality, some small addition is also needed for the ARRAY_AGG function, as the current implementation is missing support for DISTINCT + ORDER BY. See #14413.
Are these changes tested?
Yes, both in unit tests and sqllogictests.
Are there any user-facing changes?
Users will be able to issue STRING_AGG calls with DISTINCT and ORDER BY clauses.