Support schema-qualified collation in types for PostgreSQL #12697
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The 'collation' returned by PGDialect._columns_query() is None if it matches the default collation for the type. On the other hand, if the column collation matches the one of the database but is explicitly set at column creation, the value is reflected. Related to sqlalchemy#6511.
Following a similar approach to 703a323. The CAST(..., BIGINT) for array_agg()'s elements is needed for pg8000.
The previous `if` clause was wrong as it would match the `else` branch if `default_collation_for_types` was `None` whereas we only want that branch to match if the type is in `default_collation_for_types` array.
Otherwise, reflection.cache() decorator does not work.
This avoids a join on pg_collation in _domain_query().
We add a `collation_schema` in types supporting `collation`, along with `postgresql.DOMAIN`, allowing to create respective elements with a schema-qualified collation name. Reflection is also handled for both types and domains. Fix sqlalchemy#9693.
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We add a
collation_schemain types supportingcollation, along withpostgresql.DOMAIN, allowing to create respective elements with aschema-qualified collation name.
Reflection is also handled for both types and domains.
Fix #9693.