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Make some optional features now mandatory - #108

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gmantele wants to merge 8 commits into

ivoa-std:mainfrom

gmantele:issue-94-optional-features

Open

Make some optional features now mandatory#108
gmantele wants to merge 8 commits into
ivoa-std:mainfrom
gmantele:issue-94-optional-features

Commits on Oct 5, 2026
- Make LOWER and UPPER mandatory functions
  gmantele
  committed
  7a8b001
- Remove the _Language Feature_ section from the now mandatory functions `LOWER` and `UPPER`
  gmantele
  committed
  423731f
- Make OFFSET mandatory
  gmantele
  committed
  7ef4bc7
- Make `COALESCE` mandatory
  gmantele
  committed
  3b64c0b
- Make `CAST` mandatory
  gmantele
  committed
  4393e9f
- Make CTE mandatory since they are supported by most DBMS
  gmantele
  committed
  5be919a
- Make set operations mandatory
  gmantele
  committed
  95681a7
- Simplify and complete the description of CTE
  gmantele
  committed
  af1fef0