format: add `constraint_expression` field to `CONSTRAINT_SCHEMA`
Open
Type: enhancement
- Dominant language
- C#
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- Avg merge
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- Merged PRs (30d)
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Description
### What feature or improvement would you like to see?
We expose information about constraints, but not their definition, which is accessible in some systems.
- MSSQL: https://learn.microsoft.com/en-us/sql/relational-databases/system-catalog-views/sys-check-constraints-transact-sql?view=sql-server-ver17
- PostgreSQL: https://github.com/apache/arrow-adbc/issues/3971 (points 10, 11)
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