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authorValery Sizov <valery@gitlab.com>2016-01-25 16:52:00 +0200
committerValery Sizov <valery@gitlab.com>2016-01-25 16:52:00 +0200
commit446fed4d83c4d0a6f1f7bd1930d884636eda0be5 (patch)
treef25c8c362e5ecff26ab1ab735c974e05f435063f /config/initializers
parent0f13933175fc5ce4d906bb516a17437aa3fd1e28 (diff)
downloadgitlab-ce-446fed4d83c4d0a6f1f7bd1930d884636eda0be5.tar.gz
monkey patch for mysql 5.7monkey_patch
Diffstat (limited to 'config/initializers')
-rw-r--r--config/initializers/monkey_patch.rb48
1 files changed, 48 insertions, 0 deletions
diff --git a/config/initializers/monkey_patch.rb b/config/initializers/monkey_patch.rb
new file mode 100644
index 00000000000..62b05a55285
--- /dev/null
+++ b/config/initializers/monkey_patch.rb
@@ -0,0 +1,48 @@
+## This patch is from rails 4.2-stable. Remove it when 4.2.6 is released
+## https://github.com/rails/rails/issues/21108
+
+module ActiveRecord
+ module ConnectionAdapters
+ class AbstractMysqlAdapter < AbstractAdapter
+ # SHOW VARIABLES LIKE 'name'
+ def show_variable(name)
+ variables = select_all("select @@#{name} as 'Value'", 'SCHEMA')
+ variables.first['Value'] unless variables.empty?
+ rescue ActiveRecord::StatementInvalid
+ nil
+ end
+
+
+ # MySQL is too stupid to create a temporary table for use subquery, so we have
+ # to give it some prompting in the form of a subsubquery. Ugh!
+ def subquery_for(key, select)
+ subsubselect = select.clone
+ subsubselect.projections = [key]
+
+ subselect = Arel::SelectManager.new(select.engine)
+ subselect.project Arel.sql(key.name)
+ # Materialized subquery by adding distinct
+ # to work with MySQL 5.7.6 which sets optimizer_switch='derived_merge=on'
+ subselect.from subsubselect.distinct.as('__active_record_temp')
+ end
+ end
+ end
+end
+
+module ActiveRecord
+ module ConnectionAdapters
+ class MysqlAdapter < AbstractMysqlAdapter
+ ADAPTER_NAME = 'MySQL'.freeze
+
+ # Get the client encoding for this database
+ def client_encoding
+ return @client_encoding if @client_encoding
+
+ result = exec_query(
+ "select @@character_set_client",
+ 'SCHEMA')
+ @client_encoding = ENCODINGS[result.rows.last.last]
+ end
+ end
+ end
+end