Merge pull request #18856 from al2o3cr/issue_17897

Match table names exactly on MySQL

activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb

@@ -482,8 +482,16 @@ def collation
         show_variable 'collation_database'
       end
 
-      def tables(name = nil) # :nodoc:
-        select_values("SHOW FULL TABLES", 'SCHEMA')
+      def tables(name = nil, database = nil, like = nil) #:nodoc:
+        database ||= current_database
+
+        sql = "SELECT table_name FROM information_schema.tables "
+        sql << "WHERE table_schema = #{quote(database)}"
+        sql << " AND table_name = #{quote(like)}" if like
+
+        execute_and_free(sql, 'SCHEMA') do |result|
+          result.collect(&:first)
+        end
       end
       alias data_sources tables
 

activerecord/test/cases/test_case.rb

@@ -103,7 +103,7 @@ def clear_log; self.log = []; self.log_all = []; end
     # ignored SQL, or better yet, use a different notification for the queries
     # instead examining the SQL content.
     oracle_ignored     = [/^select .*nextval/i, /^SAVEPOINT/, /^ROLLBACK TO/, /^\s*select .* from all_triggers/im, /^\s*select .* from all_constraints/im, /^\s*select .* from all_tab_cols/im]
-    mysql_ignored      = [/^SHOW FULL TABLES/i, /^SHOW FULL FIELDS/, /^SHOW CREATE TABLE /i, /^SHOW VARIABLES /, /^\s*SELECT (?:column_name|table_name)\b.*\bFROM information_schema\.(?:key_column_usage|tables)\b/im]
+    mysql_ignored      = [/^SHOW FULL TABLES/i, /^SHOW FULL FIELDS/, /^SHOW CREATE TABLE /i, /^SHOW VARIABLES /, /^SELECT DATABASE\(\) as db$/, /^SELECT table_name FROM information_schema\.tables/]
     postgresql_ignored = [/^\s*select\b.*\bfrom\b.*pg_namespace\b/im, /^\s*select tablename\b.*from pg_tables\b/im, /^\s*select\b.*\battname\b.*\bfrom\b.*\bpg_attribute\b/im, /^SHOW search_path/i]
     sqlite3_ignored =    [/^\s*SELECT name\b.*\bFROM sqlite_master/im, /^\s*SELECT sql\b.*\bFROM sqlite_master/im]