Unary minus operation for the smallest possible signed long long value
(LONLONG_MIN) is undefined in C++. Because of this, func_time.test
failed on ppc64 buildbot machines.

Fixing the code to avod using undefined operations.

This is fix is similar to "MDEV-7973 bigint fail with gcc 5.0"

alloc_root(): unpoison only requested amount of bytes instead of a
possible bigger aligned-sized buffer.

For the original test in 10.0 it was not really important if
find_user_wild() or find_user_exact() is used in sp_grant_privileges().
sp-security.test passed with either of them.

Fixing the test so it reliably fails with find_user_wild()
and pass with find_user_exact().

             table->pos_in_locked_tables->table == table'
             failed in mark_used_tables_as_free_for_reuse

Assertion failure can be triggered by some DDL executed under LOCK TABLES
that holds lock for DDL target table multiple times (either explicitly or
implcitly).

When closing all table instances for given table (e.g. when preparing for
table removal during CREATE OR REPLACE), only one instance was removed
from m_locked_tables list.

Later we attempt to re-insert one of the instances in mysql_create_table()/
add_back_last_deleted_lock(), which wasn't actually removed. This leads
to m_locks_tables corruption, specifically loss of all following elements.

Then UNLOCK TABLE won't reset some table instances properly (specifically
pos_in_locked_tables), since they're not present in m_locked_tables.

Eventually such table instance gets released to table cache and then
re-used by subsequent statement, which triggers this assertion failure.

multi_delete sets TABLE::no_cache=1 and should set it to 0 when DELETE is done.

don't create static objects that destroy mutexes from destructors,
and don't destroy mutexes from .so destructor (on-unload) function.

if it happens after exit(), P_S will be long gone by that time

this fixes tokudb tests crashing on quantal-amd64

MDEV-16465 Invalid (old?) table or database name or hang in ha_innobase::delete_table and log semaphore wait upon concurrent DDL with foreign keys

lowercase db and table names before prelocking.

Post-fix for 9180e866

This fixes failures on main.lowercase_table4 on Windows

           for blob column

Moved delete_stat_values_for_table_share() call to proper place.

MDEV-16465 Invalid (old?) table or database name or hang in ha_innobase::delete_table and log semaphore wait upon concurrent DDL with foreign keys

Disable "Invalid (old?) table or database name" warning when
converting table names in InnoDB's get_foreign_key_info().

Because a name can be a temporary table name during the ALTER TABLE,
and some other thread can do SHOW CREATE TABLE for the other table
in the FK relationships _anytime_.

MDEV-16465 Invalid (old?) table or database name or hang in ha_innobase::delete_table and log semaphore wait upon concurrent DDL with foreign keys

ALTER TABLE locks the table with TL_READ_NO_INSERT, to prevent the
source table modifications while it's being copied. But there's an
indirect way of modifying a table, via cascade FK actions.

After previous commits, an attempt to modify an FK parent table
will cause FK children to be prelocked, so the table-being-altered
cannot be modified by a cascade FK action, because ALTER holds a
lock and prelocking will wait.

But if a new FK is being added by this very ALTER, then the target
table is not locked yet (it's a temporary table). So, we have to
lock FK parents explicitly.

Backport of 794f71cb

table_already_fk_prelocked() was looking for a table in the wrong
list (not the complete list of prelocked tables, but only in its tail,
starting from the current table - which is always empty for the last
added table), so for circular FKs it kept adding same tables to the list
indefinitely.

Backport of d6d7e169

Backport of f1362910

Use TABLE::init_one_table(), don't duplicate it.
Put additional initializations into TABLE::init_one_table_for_prelocking()

Backport of f1362910

instead of returning strings for CASCADE/RESTRICT
from every storage engine, use enum values

Backport of a3614d33

test case

A test case and a followup fix

Missed one file in last push...

The problem was that join_columns creation was not finished due to error of notfound column in USING, but next execution tried to use join_columns lists.

Solution is cleanup the lists on error. It can eat memory in statement MEM_ROOT but it is an error and error will be fixed or statement/procedure removed/altered.

Problem was that SQL level tried to read a record with rnd_pos()
that was already deleted by the same statement.
In the case where the page for the record had been deleted, this
caused an assert.
Fixed by extending the assert to also handle empty pages and
return HA_ERR_RECORD_DELETED for reads to deleted pages.

            optimizer_use_condition_selectivity>=3

Selectivity analysis should be disabled for Geometrical columns
for the case like geometric_field= string_constant.

Currently for selectivity calculation we perform range analysis for a column even when we don't have any statistics(EITS).
This makes less sense but is used to catch contradiction for WHERE condition.

So the solution is to not perform range analysis for selectivity calculation for columns that do not have statistics.

No need to read statistics for tables that are not USER tables.
We allocate memory for structures to collect statistics only for USER TABLES.

Warning:
'delete' applied to a pointer that was allocated with 'new[]';
did you mean 'delete[]'?

Avoids compile errors of the form:

/storage/connect/jdbconn.cpp:1473:41: error: cannot initialize a parameter of type 'jboolean *' (aka 'unsigned char *') with an rvalue of type 'jboolean' (aka 'unsigned char')
   name = env->GetStringUTFChars(label, (jboolean)false);
                                        ^~~~~~~~~~~~~~~
/usr/lib/jvm/java-8-oracle/include/jni.h:1616:58: note: passing argument to parameter 'isCopy' here
    const char* GetStringUTFChars(jstring str, jboolean *isCopy) {