[mysql] core adapter compat - missing initialize_schema_migrations_table and helpers
[mysql] make sure new_column works - we now export a MySQL::Column constant
[mysql] fix new_column and move Column#initialize + introduce a AR42 constant
[postgres] export Column class (simplifies code and aligns with a "future" convention)
export Column classes for MSSQL and Oracle
[mysql] backport rename_index from Rails (corectly handling MariaDB as well)

https://github.com/rails/rails/commit/11338183265f759b07c8dffd526b92
ENV_JAVA (a Java::OrgJrubyJavaUtil::SystemPropertiesMap) does not like replace(arg1)
[mysql] correctly map config[:encoding] into Connector-J characterEncoding property
[derby] improve native quoted impls - no need for shared String instances
[hsqldb] aligned with (future) new conventions for resolving Column/JdbcConnection
[h2] aligned with (future) new conventions for resolving Column/JdbcConnection ...
extended API with schema helpers to better handle DB object resolution in schema(s)
minor H2 connection optimizations - avoid connection meta-data retrieval
(phase one) refactoring adapter's column/connection impl resolution
- connection is expected to be exported as a JdbcConnection constant
- column impl's class shall be resolved using the Column constant
- introduce column/adapter classes for ones we missed so far ...
newEmptyString sounds better
better match JRuby's RubyTime internals while parsing TS in terms on millis and nanos
some more bits to better catch failures in marshal load/dump tests
[mysql] do not rely on the removed structure_dump method under rake and < AR 4.0
new column convention and adapter tests for PostgreSQL/MySQL
allow to specify caller depth with deprecate
add a "WARNING: " prefix for all the warning messages ArJdbc generates