Problem:
When processing cross-engine queries like:
update cstab1 set a=100 where a not in (select a from innotab1 where a=11);
delete from innotab1 where a not in (select a from cstab1 where a=1);
the ColumnStore plugin erroneously executed the whole query inside
ColumnStore.
Fix:
- Adding a new member cal_connection_info::lock_type and setting it
inside ha_mcs_impl_external_lock() to the value passed in the parameter
"lock_type".
- Adding a method cal_connection_info::isReadOnly() to test
if the last table lock made in ha_mcs_impl_external_lock()
for done for reading.
- Adding a new condition checking cal_connection_info::isReadOnly() inside
ha_mcs_impl_rnd_init(). If the current table was locked last time for reading,
then doUpdateDelete() should not be executed.
f00cc571b5