Refresh fork

This is useful especially in case of cursor_sharing=exact

(cherry picked from commit f8b7a1a)

(cherry picked from commit f8021f8)

* Set JDBC statement cache size in database config

(cherry picked from commit 1c52814)

* Fix rubocop findings

(cherry picked from commit e099b4f)

* Ruby 3.0.0 Released
https://www.ruby-lang.org/en/news/2020/12/25/ruby-3-0-0-released/

CI against Ruby 3.0.0

Refer minitest/minitest#861
minitest/minitest#862

Exclude `ruby-head` and `ruby-debug` until minitest allows Ruby 3.1

Related to #2025

Do not mark `wontfix` is `upstream` label attached

* Fix write_lobs "invalid byte sequence in UTF-8"

write_lobs checks to see whether the value is blank before executing the SQL statement. If the LOB is binary blank? call causes "invalid byte sequence in UTF-8" exception. We can instead use unless value, which is applicable both to strings and binary data.

* check serialized columns to be nil

ActiveRecord persists empty Array ([]) and Hash ({}) as nil. So, after serializing the value need to check again.

* Save non UTF-8 string in binary column

* Fix layout offense

* Fix space offenses

* copy test string in order to force encoding

* Use unary plus to unfreeze

* Without this commit

```ruby
$ ruby active_record_gem_spec.rb
Fetching https://github.com/rails/rails.git
... snip ...
Using rails 6.2.0.alpha from https://github.com/rails/rails.git (at master@afc79e3)
$
```

* With this commit

```ruby
$ ruby active_record_gem_spec.rb
Fetching https://github.com/rails/rails.git
... snip ...
Using rails 6.2.0.alpha from https://github.com/rails/rails.git (at master@afc79e3)
-- create_table(:posts, {:force=>true})
D, [2021-01-01T17:27:35.727438 #554514] DEBUG -- :    (20.9ms)  DROP TABLE "POSTS"
D, [2021-01-01T17:27:35.733266 #554514] DEBUG -- :    (5.4ms)  DROP SEQUENCE "POSTS_SEQ"
D, [2021-01-01T17:27:35.748060 #554514] DEBUG -- :    (14.4ms)  CREATE TABLE "POSTS" ("ID" NUMBER(38) NOT NULL PRIMARY KEY)
D, [2021-01-01T17:27:35.751081 #554514] DEBUG -- :    (2.8ms)  CREATE SEQUENCE "POSTS_SEQ" START WITH 1
   -> 0.1797s
-- create_table(:comments, {:force=>true})
D, [2021-01-01T17:27:35.869071 #554514] DEBUG -- :    (21.4ms)  DROP TABLE "COMMENTS"
D, [2021-01-01T17:27:35.875660 #554514] DEBUG -- :    (6.3ms)  DROP SEQUENCE "COMMENTS_SEQ"
D, [2021-01-01T17:27:35.884094 #554514] DEBUG -- :    (8.0ms)  CREATE TABLE "COMMENTS" ("ID" NUMBER(38) NOT NULL PRIMARY KEY, "POST_ID" NUMBER(38))
D, [2021-01-01T17:27:35.887143 #554514] DEBUG -- :    (2.8ms)  CREATE SEQUENCE "COMMENTS_SEQ" START WITH 1
   -> 0.1359s
D, [2021-01-01T17:27:36.043216 #554514] DEBUG -- :   ActiveRecord::InternalMetadata Load (1.4ms)  SELECT "AR_INTERNAL_METADATA".* FROM "AR_INTERNAL_METADATA" WHERE "AR_INTERNAL_METADATA"."KEY" = :a1 FETCH FIRST :a2 ROWS ONLY  [["key", "environment"], ["LIMIT", 1]]
D, [2021-01-01T17:27:36.688610 #554514] DEBUG -- :   Post Create (8.4ms)  INSERT INTO "POSTS" ("ID") VALUES (:a1)  [["id", 1]]
D, [2021-01-01T17:27:37.203028 #554514] DEBUG -- :   Comment Create (7.5ms)  INSERT INTO "COMMENTS" ("ID") VALUES (:a1)  [["id", 1]]
D, [2021-01-01T17:27:37.214316 #554514] DEBUG -- :   Comment Update (3.7ms)  UPDATE "COMMENTS" SET "POST_ID" = :a1 WHERE "COMMENTS"."ID" = :a2  [["post_id", 1], ["id", 1]]
D, [2021-01-01T17:27:37.221641 #554514] DEBUG -- :    (5.0ms)  SELECT COUNT(*) FROM "COMMENTS" WHERE "COMMENTS"."POST_ID" = :a1  [["post_id", 1]]
D, [2021-01-01T17:27:37.226691 #554514] DEBUG -- :    (4.2ms)  SELECT COUNT(*) FROM "COMMENTS"
D, [2021-01-01T17:27:37.231298 #554514] DEBUG -- :   Comment Load (3.5ms)  SELECT "COMMENTS".* FROM "COMMENTS" ORDER BY "COMMENTS"."ID" ASC FETCH FIRST :a1 ROWS ONLY  [["LIMIT", 1]]
D, [2021-01-01T17:27:37.236094 #554514] DEBUG -- :   Post Load (3.2ms)  SELECT "POSTS".* FROM "POSTS" WHERE "POSTS"."ID" = :a1 FETCH FIRST :a2 ROWS ONLY  [["id", 1], ["LIMIT", 1]]
.

Finished in 1.67 seconds (files took 0.1944 seconds to load)
1 example, 0 failures

$
```

Refer
https://relishapp.com/rspec/rspec-core/v/3-6/docs/command-line/run-with-ruby-command

Require `rspec/autorun` to run one line spec file

…binds even if primary SQL is executed with connection.unprepared_statement (like behavior of AR.to_sql).

Preserves the function of fix for issue #1687.

Revert "Require `rspec/autorun` to run one line spec file"

Follow rails/rails#41064

Enable `Lint/DuplicateRequire` cop

This cop should work with RuboCop 1.8 which includes rubocop/rubocop#9291

```ruby
$ bundle exec rubocop -a
Inspecting 71 files
...........................C...........................................

Offenses:

lib/active_record/connection_adapters/oracle_enhanced_adapter.rb:495:39: C: [Corrected] Layout/SpaceBeforeBrackets: Remove the space before the opening brackets.
          @do_not_prefetch_primary_key [table_name] = do_not_prefetch = !has_primary_key?(table_name, owner, desc_table_name)
                                      ^

71 files inspected, 1 offense detected, 1 offense corrected

Tip: Based on detected gems, the following RuboCop extension libraries might be helpful:
  * rubocop-rake (http://github.com/rubocop-hq/rubocop-rake)
  * rubocop-rspec (http://github.com/rubocop-hq/rubocop-rspec)

You can opt out of this message by adding the following to your config (see https://docs.rubocop.org/rubocop/extensions.html#extension-suggestions for more options):
  AllCops:
    SuggestExtensions: false
$
```
Refer rubocop/rubocop#9305

Due to a bug, the SQL describing them was being discarded

…usion-bug

Ensure FKs are properly included in structure dumps

…kets_cop

Enable `Layout/SpaceBeforeBrackets` cop

Revert "Disable Travis CI"

…ease61

Address Travis CI warnings and bump Ubuntu version to 20.04

* Ruby 3.0.0 Released
https://www.ruby-lang.org/en/news/2020/12/25/ruby-3-0-0-released/

Kind of cherry-pick #2093 to master

CI against JRuby 9.2.14.0

Tidy up Travis CI configuration

Until this error is resolved
https://travis-ci.com/github/rsim/oracle-enhanced/jobs/471296127#L517

Allow failures for JRuby

…nyms

Since #2055 added /*+ OPTIMIZER_FEATURES_ENABLE('11.2.0.2') */ hint
to most of the SCHEMA queries and there are performance regressions
reported for queries to all_synonyms

Fix #2090

Remove /*+ OPTIMIZER_FEATURES_ENABLE('11.2.0.2') */ hint for all_synonyms

Prepare release v6.1.1 [skip ci]

...and filter by owner, rather than using user_tab_columns. Ensures column
comments are dumped for the current schema

…s-across-schemas

structure dump: read column comments from all_tab_cols

This is useful especially in case of cursor_sharing=exact

(cherry picked from commit f8b7a1a)

(cherry picked from commit f8021f8)

…binds even if primary SQL is executed with connection.unprepared_statement (like behavior of AR.to_sql).

Preserves the function of fix for issue #1687.

…eter_bind_usage

# Conflicts:
#	lib/active_record/connection_adapters/oracle_enhanced/structure_dump.rb