Revert "MDEV-11016 wsrep_node_is_ready() check is too strict"

This reverts commit 52ea5ad865.

# Conflicts:
#	mysql-test/suite/galera/r/galera_var_dirty_reads.result
#	mysql-test/suite/galera/t/galera_var_dirty_reads.test
#	sql/sql_parse.cc

mysql-test/suite/galera/r/galera_var_dirty_reads.result

@@ -18,22 +18,6 @@ SET @@session.wsrep_dirty_reads=ON;
 SELECT * FROM t1;
 i
 1
-#
-# MDEV-11016: wsrep_node_is_ready() check is too strict
-#
-SET @@session.wsrep_dirty_reads=OFF;
-SELECT 2;
-2
-2
-SELECT 2+2 from DUAL;
-2+2
-4
-SET @VAR=1;
-SELECT @VAR;
-@VAR
-1
-SELECT @@max_allowed_packet;
-SELECT SYSDATE() from DUAL;
 SELECT * FROM t1;
 i
 1

mysql-test/suite/galera/t/galera_var_dirty_reads.test

@@ -36,19 +36,6 @@ SET @@session.wsrep_dirty_reads=ON;
 
 SELECT * FROM t1;
 
---echo #
---echo # MDEV-11016: wsrep_node_is_ready() check is too strict
---echo #
-SET @@session.wsrep_dirty_reads=OFF;
-SELECT 2;
-SELECT 2+2 from DUAL;
-SET @VAR=1;
-SELECT @VAR;
---disable_result_log
-SELECT @@max_allowed_packet;
-SELECT SYSDATE() from DUAL;
---enable_result_log
-
 --disable_query_log
 --eval SET @@global.wsrep_cluster_address = '$wsrep_cluster_address_saved'
 --enable_query_log

sql/sql_parse.cc

@@ -2635,15 +2635,11 @@ mysql_execute_command(THD *thd)
     /*
       Bail out if DB snapshot has not been installed. We however,
       allow SET and SHOW queries.
-      SHOW and SELECT queries (only if wsrep_dirty_reads is set or when it
-      does not access ant table)
     */
     if (thd->variables.wsrep_on && !thd->wsrep_applier && !wsrep_ready &&
         lex->sql_command != SQLCOM_SET_OPTION &&
         !(thd->variables.wsrep_dirty_reads &&
           lex->sql_command == SQLCOM_SELECT) &&
-        !(lex->sql_command == SQLCOM_SELECT    &&
-         !all_tables)                          &&
         !wsrep_is_show_query(lex->sql_command))
     {
       my_message(ER_UNKNOWN_COM_ERROR,