Support java client by adding tx_isolation / query_cache_size / query…

…_cache_type / tx_readonly variables

Summary:
5.6 Java client we have today will issue following SQL query on connect:

```
/* MYSQL_CJ_FULL_PROD_NAME@ ( Revision: MYSQL_CJ_REVISION@ ) */SELECT  session.auto_increment_increment AS auto_increment_increment, character_set_client AS character_set_client, character_set_connection AS character_set_connection, character_set_results AS character_set_results, character_set_server AS character_set_server, init_connect AS init_connect, interactive_timeout AS interactive_timeout, license AS license, lower_case_table_names AS lower_case_table_names, max_allowed_packet AS max_allowed_packet, net_buffer_length AS net_buffer_length, net_write_timeout AS net_write_timeout, query_cache_size AS query_cache_size, query_cache_type AS query_cache_type, sql_mode AS sql_mode, system_time_zone AS system_time_zone, Timeroot_zone AS time_zone, tx_isolation AS tx_isolation, wait_timeout AS wait_timeout
```

It'll fail on 8.0 as tx_isolation is replaced by transaction_isolation, and query_cache_size/query_cache_type are deprecated (query cache feature is gone in 8.0). This adds a reasonable implementation of those variables to make the connector happy (without introducing other issues, hopefully), before we migrate our java client to 8.0:
1. Add dummy implementation of query_cache_size / query_cache_type that returns 0 size and cache off. Both are readonly. Note I changed query_cache_type to global as I don't want to pay for the extra bytes for a readonly variable and it doesn't make too much sense for a session variable to be read-only anyway. A new test is added as well.
2. Add read-only tx_isolation that directly maps to transaction_isolation variable. transaction_isolation_basic test is enhanced to ensure any change to transaction_isolation gets mapped to tx_isolation (which just works since they are the same variable on thd session)
3. Add read-only tx_read_only maps to transaction_read_only similar to #2 for cases Java cient calls connection.isReadOnly.

Reviewed By: zhichengzhu

Differential Revision: D19551619

mysql-test/collections/disabled_rocksdb.def

@@ -72,8 +72,6 @@ rocksdb.bypass_select_scenarios_bloom : BUG#0000 Rebase: not-yet-implemented
 rocksdb.verify_tbl_share_primary_idx : BUG#0000 Rebase: not-yet-implemented
 rocksdb.bypass_select_range_sk_bloom : BUG#0000 Rebase: not-yet-implemented
 rocksdb.bypass_select_basic_bloom : BUG#0000 Rebase: not-yet-implemented
-rocksdb.rocksdb_deadlock_detect_rc : BUG#0000 Rebase: not-yet-implemented
-rocksdb.rocksdb_deadlock_detect_rr : BUG#0000 Rebase: not-yet-implemented
 rocksdb.bloomfilter2 : BUG#0000 Rebase: not-yet-implemented
 rocksdb.bloomfilter3 : BUG#0000 Rebase: not-yet-implemented
 rocksdb.skip_scan : BUG#0000 Rebase: not-yet-implemented

mysql-test/suite/sys_vars/r/per_user_session_var_default_val_validation.result

@@ -107,9 +107,6 @@ ERROR 42000: Variable 'per_user_session_var_default_val' can't be set to the val
 ## Unsupported type 'flagset'
 SET GLOBAL per_user_session_var_default_val = "u1:optimizer_switch=xyz";
 ERROR 42000: Variable 'per_user_session_var_default_val' can't be set to the value of 'u1:optimizer_switch=xyz'
-## Read-Only
-SET GLOBAL per_user_session_var_default_val = "usr1:tx_isolation=READ-COMMITTED";
-ERROR 42000: Variable 'per_user_session_var_default_val' can't be set to the value of 'usr1:tx_isolation=READ-COMMITTED'
 ##
 ## root privilege is required to set session variable binglog_format
 ## root privilege will be granted to usr1 temporarily to get this done

mysql-test/suite/sys_vars/r/query_cache_size_basic.result

@@ -0,0 +1,5 @@
+SELECT @@global.query_cache_size;
+@@global.query_cache_size
+0
+SET @@global.query_cache_size=10*1024;
+ERROR HY000: Variable 'query_cache_size' is a read only variable

mysql-test/suite/sys_vars/r/query_cache_type_basic.result

@@ -0,0 +1,5 @@
+SELECT @@global.query_cache_type;
+@@global.query_cache_type
+OFF
+SET @@global.query_cache_type='ON';
+ERROR HY000: Variable 'query_cache_type' is a read only variable

mysql-test/suite/sys_vars/r/transaction_isolation_basic.result

@@ -23,10 +23,16 @@ SET @@global.transaction_isolation = DEFAULT;
 SELECT @@global.transaction_isolation;
 @@global.transaction_isolation
 REPEATABLE-READ
+SELECT @@global.tx_isolation;
+@@global.tx_isolation
+REPEATABLE-READ
 SET @@session.transaction_isolation = DEFAULT;
 SELECT @@session.transaction_isolation;
 @@session.transaction_isolation
 REPEATABLE-READ
+SELECT @@session.tx_isolation;
+@@session.tx_isolation
+REPEATABLE-READ
 #########################################################
 #      Check if NULL or empty value is accepeted        #
 #########################################################
@@ -45,34 +51,58 @@ SET @@global.transaction_isolation = 'READ-UNCOMMITTED';
 SELECT @@global.transaction_isolation;
 @@global.transaction_isolation
 READ-UNCOMMITTED
+SELECT @@global.tx_isolation;
+@@global.tx_isolation
+READ-UNCOMMITTED
 SET @@global.transaction_isolation = 'read-COMMITTED';
 SELECT @@global.transaction_isolation;
 @@global.transaction_isolation
 READ-COMMITTED
+SELECT @@global.tx_isolation;
+@@global.tx_isolation
+READ-COMMITTED
 SET @@global.transaction_isolation = 'REPEATABLE-READ';
 SELECT @@global.transaction_isolation;
 @@global.transaction_isolation
 REPEATABLE-READ
+SELECT @@global.tx_isolation;
+@@global.tx_isolation
+REPEATABLE-READ
 SET @@global.transaction_isolation = 'SERIALIZable';
 SELECT @@global.transaction_isolation;
 @@global.transaction_isolation
 SERIALIZABLE
+SELECT @@global.tx_isolation;
+@@global.tx_isolation
+SERIALIZABLE
 SET @@session.transaction_isolation = 'READ-UNCOMMITTED';
 SELECT @@session.transaction_isolation;
 @@session.transaction_isolation
 READ-UNCOMMITTED
+SELECT @@session.tx_isolation;
+@@session.tx_isolation
+READ-UNCOMMITTED
 SET @@session.transaction_isolation = 'READ-COMMITTED';
 SELECT @@session.transaction_isolation;
 @@session.transaction_isolation
 READ-COMMITTED
+SELECT @@session.tx_isolation;
+@@session.tx_isolation
+READ-COMMITTED
 SET @@session.transaction_isolation = 'REPEATABLE-READ';
 SELECT @@session.transaction_isolation;
 @@session.transaction_isolation
 REPEATABLE-READ
+SELECT @@session.tx_isolation;
+@@session.tx_isolation
+REPEATABLE-READ
 SET @@session.transaction_isolation = 'serializable';
 SELECT @@session.transaction_isolation;
 @@session.transaction_isolation
 SERIALIZABLE
+SELECT @@session.tx_isolation;
+@@session.tx_isolation
+SERIALIZABLE
 #######################################################################
 #      Change the value of transaction_isolation to invalid value     #
 #######################################################################
@@ -107,6 +137,11 @@ FROM performance_schema.session_variables
 WHERE VARIABLE_NAME='transaction_isolation';
 @@session.transaction_isolation = VARIABLE_VALUE
 1
+SELECT @@session.tx_isolation = VARIABLE_VALUE
+FROM performance_schema.session_variables
+WHERE VARIABLE_NAME='tx_isolation';
+@@session.tx_isolation = VARIABLE_VALUE
+1
 #########################################################################
 #     Check if the value in GLOBAL Table matches value in variable      #
 #########################################################################
@@ -115,25 +150,42 @@ FROM performance_schema.global_variables
 WHERE VARIABLE_NAME='transaction_isolation';
 @@global.transaction_isolation = VARIABLE_VALUE
 1
+SELECT @@global.tx_isolation = VARIABLE_VALUE
+FROM performance_schema.global_variables
+WHERE VARIABLE_NAME='tx_isolation';
+@@global.tx_isolation = VARIABLE_VALUE
+1
 ###################################################################
 #        Check if numbers can be used on variable                 #
 ###################################################################
 SET @@global.transaction_isolation = 0;
 SELECT @@global.transaction_isolation;
 @@global.transaction_isolation
 READ-UNCOMMITTED
+SELECT @@global.tx_isolation;
+@@global.tx_isolation
+READ-UNCOMMITTED
 SET @@global.transaction_isolation = 1;
 SELECT @@global.transaction_isolation;
 @@global.transaction_isolation
 READ-COMMITTED
+SELECT @@global.tx_isolation;
+@@global.tx_isolation
+READ-COMMITTED
 SET @@global.transaction_isolation = 2;
 SELECT @@global.transaction_isolation;
 @@global.transaction_isolation
 REPEATABLE-READ
+SELECT @@global.tx_isolation;
+@@global.tx_isolation
+REPEATABLE-READ
 SET @@global.transaction_isolation = 3;
 SELECT @@global.transaction_isolation;
 @@global.transaction_isolation
 SERIALIZABLE
+SELECT @@global.tx_isolation;
+@@global.tx_isolation
+SERIALIZABLE
 SET @@global.transaction_isolation = 0.4;
 ERROR 42000: Incorrect argument type to variable 'transaction_isolation'
 ###################################################################
@@ -143,10 +195,16 @@ SET @@global.transaction_isolation = TRUE;
 SELECT @@global.transaction_isolation;
 @@global.transaction_isolation
 READ-COMMITTED
+SELECT @@global.tx_isolation;
+@@global.tx_isolation
+READ-COMMITTED
 SET @@global.transaction_isolation = FALSE;
 SELECT @@global.transaction_isolation;
 @@global.transaction_isolation
 READ-UNCOMMITTED
+SELECT @@global.tx_isolation;
+@@global.tx_isolation
+READ-UNCOMMITTED
 ###########################################################################
 # Check if transaction_isolation can be accessed with and without @@ sign #
 ###########################################################################
@@ -159,21 +217,33 @@ SET session transaction_isolation = 'REPEATABLE-READ';
 SELECT @@transaction_isolation;
 @@transaction_isolation
 REPEATABLE-READ
+SELECT @@tx_isolation;
+@@tx_isolation
+REPEATABLE-READ
 SET global transaction_isolation = 'REPEATABLE-READ';
 SELECT @@global.transaction_isolation;
 @@global.transaction_isolation
 REPEATABLE-READ
+SELECT @@global.tx_isolation;
+@@global.tx_isolation
+REPEATABLE-READ
 ##############################
 #   Restore initial value    #
 ##############################
 SET @@global.transaction_isolation = @global_start_value;
 SELECT @@global.transaction_isolation;
 @@global.transaction_isolation
 REPEATABLE-READ
+SELECT @@global.tx_isolation;
+@@global.tx_isolation
+REPEATABLE-READ
 SET @@session.transaction_isolation = @session_start_value;
 SELECT @@session.transaction_isolation;
 @@session.transaction_isolation
 REPEATABLE-READ
+SELECT @@session.tx_isolation;
+@@session.tx_isolation
+REPEATABLE-READ
 ####################################################################
 #                    END OF transaction_isolation TESTS            #
 ####################################################################

mysql-test/suite/sys_vars/r/transaction_read_only_basic.result

@@ -12,6 +12,12 @@ SET @start_session_value = @@session.transaction_read_only;
 SELECT @start_session_value;
 @start_session_value
 0
+SELECT @@global.tx_read_only;
+@@global.tx_read_only
+0
+SELECT @@session.tx_read_only;
+@@session.tx_read_only
+0
 ########################################################################
 #     Display the DEFAULT value of transaction_read_only               #
 ########################################################################
@@ -20,65 +26,107 @@ SET @@global.transaction_read_only = DEFAULT;
 SELECT @@global.transaction_read_only;
 @@global.transaction_read_only
 0
+SELECT @@global.tx_read_only;
+@@global.tx_read_only
+0
 SET @@session.transaction_read_only = ON;
 SET @@session.transaction_read_only = DEFAULT;
 SELECT @@session.transaction_read_only;
 @@session.transaction_read_only
 0
+SELECT @@session.tx_read_only;
+@@session.tx_read_only
+0
 ##############################################################################
 # Change the value of transaction_read_only to a valid value for GLOBAL Scope#
 ##############################################################################
 SET @@global.transaction_read_only = ON;
 SELECT @@global.transaction_read_only;
 @@global.transaction_read_only
 1
+SELECT @@global.tx_read_only;
+@@global.tx_read_only
+1
 SET @@global.transaction_read_only = OFF;
 SELECT @@global.transaction_read_only;
 @@global.transaction_read_only
 0
+SELECT @@global.tx_read_only;
+@@global.tx_read_only
+0
 SET @@global.transaction_read_only = 0;
 SELECT @@global.transaction_read_only;
 @@global.transaction_read_only
 0
+SELECT @@global.tx_read_only;
+@@global.tx_read_only
+0
 SET @@global.transaction_read_only = 1;
 SELECT @@global.transaction_read_only;
 @@global.transaction_read_only
 1
+SELECT @@global.tx_read_only;
+@@global.tx_read_only
+1
 SET @@global.transaction_read_only = TRUE;
 SELECT @@global.transaction_read_only;
 @@global.transaction_read_only
 1
+SELECT @@global.tx_read_only;
+@@global.tx_read_only
+1
 SET @@global.transaction_read_only = FALSE;
 SELECT @@global.transaction_read_only;
 @@global.transaction_read_only
 0
+SELECT @@global.tx_read_only;
+@@global.tx_read_only
+0
 ###############################################################################
 # Change the value of transaction_read_only to a valid value for SESSION Scope#
 ###############################################################################
 SET @@session.transaction_read_only = ON;
 SELECT @@session.transaction_read_only;
 @@session.transaction_read_only
 1
+SELECT @@session.tx_read_only;
+@@session.tx_read_only
+1
 SET @@session.transaction_read_only = OFF;
 SELECT @@session.transaction_read_only;
 @@session.transaction_read_only
 0
+SELECT @@session.tx_read_only;
+@@session.tx_read_only
+0
 SET @@session.transaction_read_only = 0;
 SELECT @@session.transaction_read_only;
 @@session.transaction_read_only
 0
+SELECT @@session.tx_read_only;
+@@session.tx_read_only
+0
 SET @@session.transaction_read_only = 1;
 SELECT @@session.transaction_read_only;
 @@session.transaction_read_only
 1
+SELECT @@session.tx_read_only;
+@@session.tx_read_only
+1
 SET @@session.transaction_read_only = TRUE;
 SELECT @@session.transaction_read_only;
 @@session.transaction_read_only
 1
+SELECT @@session.tx_read_only;
+@@session.tx_read_only
+1
 SET @@session.transaction_read_only = FALSE;
 SELECT @@session.transaction_read_only;
 @@session.transaction_read_only
 0
+SELECT @@session.tx_read_only;
+@@session.tx_read_only
+0
 ################################################################
 # Change the value of transaction_read_only to an invalid value#
 ################################################################
@@ -141,6 +189,9 @@ SET @@global.transaction_read_only = ON;
 SELECT @@transaction_read_only = @@global.transaction_read_only;
 @@transaction_read_only = @@global.transaction_read_only
 0
+SELECT @@tx_read_only = @@global.transaction_read_only;
+@@tx_read_only = @@global.transaction_read_only
+0
 ##############################################################################
 #    Check if accessing variable with SESSION,LOCAL and without SCOPE points #
 #    to same session variable                                                #
@@ -152,6 +203,9 @@ SELECT @@transaction_read_only = @@local.transaction_read_only;
 SELECT @@local.transaction_read_only = @@session.transaction_read_only;
 @@local.transaction_read_only = @@session.transaction_read_only
 1
+SELECT @@local.tx_read_only = @@session.transaction_read_only;
+@@local.tx_read_only = @@session.transaction_read_only
+1
 ###############################################################################
 #   Check if transaction_read_only can be accessed with and without @@ sign   #
 ###############################################################################
@@ -162,9 +216,14 @@ SET transaction_read_only = 1;
 SELECT @@transaction_read_only;
 @@transaction_read_only
 1
+SELECT @@tx_read_only;
+@@tx_read_only
+1
 # name1.name2 refers to database_name.table_name
 SELECT session.transaction_read_only;
 ERROR 42S02: Unknown table 'session' in field list
+SELECT session.tx_read_only;
+ERROR 42S02: Unknown table 'session' in field list
 ####################################
 #     Restore initial value        #
 ####################################

mysql-test/suite/sys_vars/r/tx_isolation_basic.result

@@ -0,0 +1,4 @@
+SET @@session.tx_isolation ='READ-COMMITTED';
+ERROR HY000: Variable 'tx_isolation' is a read only variable
+SET @@global.tx_isolation ='READ-COMMITTED';
+ERROR HY000: Variable 'tx_isolation' is a read only variable

mysql-test/suite/sys_vars/r/tx_read_only_basic.result

@@ -0,0 +1,4 @@
+SET @@session.tx_read_only = 0;
+ERROR HY000: Variable 'tx_read_only' is a read only variable
+SET @@global.tx_read_only = 0;
+ERROR HY000: Variable 'tx_read_only' is a read only variable

mysql-test/suite/sys_vars/t/per_user_session_var_default_val_validation.test

@@ -154,10 +154,6 @@ SET GLOBAL per_user_session_var_default_val = "u1:optimizer_switch=index_merge=o
 --error ER_WRONG_VALUE_FOR_VAR
 SET GLOBAL per_user_session_var_default_val = "u1:optimizer_switch=xyz";
 
---echo ## Read-Only
---error ER_WRONG_VALUE_FOR_VAR
-SET GLOBAL per_user_session_var_default_val = "usr1:tx_isolation=READ-COMMITTED";
-
 --echo ##
 --echo ## root privilege is required to set session variable binglog_format
 --echo ## root privilege will be granted to usr1 temporarily to get this done

mysql-test/suite/sys_vars/t/query_cache_size_basic.test

@@ -0,0 +1,4 @@
+SELECT @@global.query_cache_size;
+
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
+SET @@global.query_cache_size=10*1024;

mysql-test/suite/sys_vars/t/query_cache_type_basic.test

@@ -0,0 +1,4 @@
+SELECT @@global.query_cache_type;
+
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
+SET @@global.query_cache_type='ON';