diff options
5 files changed, 49 insertions, 7 deletions
diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md index 97b7ad93d1..94061a076d 100644 --- a/activerecord/CHANGELOG.md +++ b/activerecord/CHANGELOG.md @@ -1,3 +1,12 @@ +* Support expression indexes for MySQL. + + 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 + + *Ryuta Kamizono* + * Fix collection cache key with limit and custom select to avoid ambiguous timestamp column error. Fixes #33056. diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb index 0f73641369..13c799b64a 100644 --- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb @@ -72,6 +72,10 @@ module ActiveRecord !mariadb? && version >= "8.0.1" end + def supports_expression_index? + !mariadb? && version >= "8.0.13" + end + def supports_transaction_isolation? true end diff --git a/activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb index e167c01802..65e9a1fda5 100644 --- a/activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb +++ b/activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb @@ -35,13 +35,39 @@ module ActiveRecord ] end - indexes.last[-2] << row[:Column_name] - indexes.last[-1][:lengths][row[:Column_name]] = row[:Sub_part].to_i if row[:Sub_part] - indexes.last[-1][:orders].merge!(row[:Column_name] => :desc) if row[:Collation] == "D" + if row[:Expression] + expression = row[:Expression] + expression = +"(#{expression})" unless expression.start_with?("(") + indexes.last[-2] << expression + indexes.last[-1][:expressions] ||= {} + indexes.last[-1][:expressions][expression] = expression + indexes.last[-1][:orders][expression] = :desc if row[:Collation] == "D" + else + indexes.last[-2] << row[:Column_name] + indexes.last[-1][:lengths][row[:Column_name]] = row[:Sub_part].to_i if row[:Sub_part] + indexes.last[-1][:orders][row[:Column_name]] = :desc if row[:Collation] == "D" + end end end - indexes.map { |index| IndexDefinition.new(*index) } + indexes.map do |index| + options = index.last + + if expressions = options.delete(:expressions) + orders = options.delete(:orders) + lengths = options.delete(:lengths) + + columns = index[-2].map { |name| + [ name.to_sym, expressions[name] || +quote_column_name(name) ] + }.to_h + + index[-2] = add_options_for_index_columns( + columns, order: orders, length: lengths + ).values.join(", ") + end + + IndexDefinition.new(*index) + end end def remove_column(table_name, column_name, type = nil, options = {}) diff --git a/activerecord/test/cases/schema_dumper_test.rb b/activerecord/test/cases/schema_dumper_test.rb index db13f20a39..dda3efa47c 100644 --- a/activerecord/test/cases/schema_dumper_test.rb +++ b/activerecord/test/cases/schema_dumper_test.rb @@ -229,11 +229,14 @@ class SchemaDumperTest < ActiveRecord::TestCase if ActiveRecord::Base.connection.supports_expression_index? def test_schema_dump_expression_indices index_definition = dump_table_schema("companies").split(/\n/).grep(/t\.index.*company_expression_index/).first.strip + index_definition.sub!(/, name: "company_expression_index"\z/, "") if current_adapter?(:PostgreSQLAdapter) - assert_match %r{CASE.+lower\(\(name\)::text\)}i, index_definition + assert_match %r{CASE.+lower\(\(name\)::text\).+END\) DESC"\z}i, index_definition + elsif current_adapter?(:Mysql2Adapter) + assert_match %r{CASE.+lower\(`name`\).+END\) DESC"\z}i, index_definition elsif current_adapter?(:SQLite3Adapter) - assert_match %r{CASE.+lower\(name\)}i, index_definition + assert_match %r{CASE.+lower\(name\).+END\) DESC"\z}i, index_definition else assert false end diff --git a/activerecord/test/schema/schema.rb b/activerecord/test/schema/schema.rb index 4ef463fdad..56ff81af29 100644 --- a/activerecord/test/schema/schema.rb +++ b/activerecord/test/schema/schema.rb @@ -216,7 +216,7 @@ ActiveRecord::Schema.define do t.index [:firm_id, :type, :rating], name: "company_index", length: { type: 10 }, order: { rating: :desc } t.index [:firm_id, :type], name: "company_partial_index", where: "(rating > 10)" t.index :name, name: "company_name_index", using: :btree - t.index "(CASE WHEN rating > 0 THEN lower(name) END)", name: "company_expression_index" if supports_expression_index? + t.index "(CASE WHEN rating > 0 THEN lower(name) END) DESC", name: "company_expression_index" if supports_expression_index? end create_table :content, force: true do |t| |