| Commit message (Collapse) | Author | Age | Files | Lines |
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MySQL 8.0.13 and higher supports default value to be a function or
expression.
https://dev.mysql.com/doc/refman/8.0/en/create-table.html
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MySQL 8.0.13 and higher supports functional key parts that index
expression values rather than column or column prefix values.
https://dev.mysql.com/doc/refman/8.0/en/create-index.html
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In Ruby 2.3 or later, `String#+@` is available and `+@` is faster than `dup`.
```ruby
# frozen_string_literal: true
require "bundler/inline"
gemfile(true) do
source "https://rubygems.org"
gem "benchmark-ips"
end
Benchmark.ips do |x|
x.report('+@') { +"" }
x.report('dup') { "".dup }
x.compare!
end
```
```
$ ruby -v benchmark.rb
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
Warming up --------------------------------------
+@ 282.289k i/100ms
dup 187.638k i/100ms
Calculating -------------------------------------
+@ 6.775M (± 3.6%) i/s - 33.875M in 5.006253s
dup 3.320M (± 2.2%) i/s - 16.700M in 5.032125s
Comparison:
+@: 6775299.3 i/s
dup: 3320400.7 i/s - 2.04x slower
```
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Use attr_reader/attr_writer instead of methods
method is 12% slower
Use flat_map over map.flatten(1)
flatten is 66% slower
Use hash[]= instead of hash.merge! with single arguments
merge! is 166% slower
See https://github.com/rails/rails/pull/32337 for more conversation
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The TIME, DATETIME, and TIMESTAMP types [have supported](https://mariadb.com/kb/en/library/microseconds-in-mariadb/)
a fractional seconds precision from 0 to 6.
Default values from time columns with specified precision is read
as `current_timestamp(n)` from information schema.
rake `db:schema:dump` produces `schema.rb` **without** default values for time columns with the specified precision:
t.datetime "last_message_at", precision: 6, null: false
rake `db:schema:dump` produces `schema.rb` **with** default values for time columns with the specified precision:
t.datetime "last_message_at", precision: 6, default: -> { "current_timestamp(6)" }, null: false
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`options_for_index_columns`
And placed `add_options_for_index_columns` in `schema_statements.rb`
consistently to ease to find related code.
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Currently `SchemaDumper` is only customizable for column options. But
3rd party connection adapters (oracle-enhanced etc) need to customizable
for table or index dumping also. To make it possible, I introduced
adapter specific `SchemaDumper` classes for that.
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Since MariaDB 10.2, `CURRENT_TIMESTAMP` is shown as a function
(`current_timestamp()`). Fix matching column default to address that
case.
Fixes #29698.
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This reverts commit 3420a14590c0e6915d8b6c242887f74adb4120f9, reversing
changes made to afb66a5a598ce4ac74ad84b125a5abf046dcf5aa.
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Enforce frozen string in Rubocop
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Unlike with other databses, MySQL doesn't let you remove the column
if there's a FK on this column.
For better developer experience we want to remove the FK together with
the column.
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`internal_string_options_for_primary_key` is used for creating internal
tables in newly apps. But it is no longer needed after MySQL 8.0.0.
MySQL 5.7 has introduced `innodb_default_row_format` (default `DYNAMIC`)
and has deprecated `innodb_large_prefix` and `innodb_file_format`.
The purpose of the deprecated options was for compatibility with earlier
versions of InnoDB.
https://dev.mysql.com/doc/refman/5.7/en/innodb-parameters.html#sysvar_innodb_large_prefix
> innodb_large_prefix is deprecated and will be removed in a future
release. innodb_large_prefix was introduced in MySQL 5.5 to disable
large index key prefixes for compatibility with earlier versions of
InnoDB that do not support large index key prefixes.
https://dev.mysql.com/doc/refman/5.7/en/innodb-parameters.html#sysvar_innodb_file_format
> The innodb_file_format option is deprecated and will be removed in a
future release. The purpose of the innodb_file_format option was to
allow users to downgrade to the built-in version of InnoDB in MySQL 5.1.
Now that MySQL 5.1 has reached the end of its product lifecycle,
downgrade support provided by this option is no longer necessary.
The deprecated options has removed in MySQL 8.0.0. It is no longer
needed to take care newly created internal tables as a legacy format
after MySQL 8.0.0.
Fixes #28730.
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MySQL 8.0.1 and higher supports descending indexes: `DESC` in an index
definition is no longer ignored.
See https://dev.mysql.com/doc/refman/8.0/en/descending-indexes.html.
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* Use keyword arguments in `IndexDefinition` to ease to ignore unused
options and to avoid to initialize incorrect empty value.
* Place it in `SchemaStatements` for consistency.
* And tiny tweaks.
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