MDEV-11438 Assertion `null_value' failed in Item::send(Protocol*, String*) upon casting NULL as JSON.

        test added.

        Depth of nested objects should be controlled.

        The depth of nested arrays should be controlled, as it's limited.

        Item_func_json_search::val_str didn't set the null_value
        properly. So that affected the next record in the resultset.

        JSON_ARRAY didn't expect 0 arguments.

        CAST AS JSON didn't set the null_value mark properly.

        Some JSON functions didn't expect NULL as a path.

MDEV-11442 Server crashes in String::length / parse_one_or_all /Item_func_json_contains_path::val_int

        Didn't expect 'one_or_all' parameter to be NULL.

        Wrong 'value_lengh' taken

MDEV-11168: InnoDB: Failing assertion: !other_lock || wsrep_thd_is_BF(lock->trx->mysql_thd, FALSE) || wsrep_thd_is_BF(other_lock->trx->mysql_thd, FALSE)

Merge fix from 10.1.

trx_state_eq(): Add the parameter bool relaxed=false, to
allow trx->state==TRX_STATE_NOT_STARTED where a different
state is expected, if an error has been reported.

trx_release_savepoint_for_mysql(): Pass relaxed=true to
trx_state_eq(). That is, allow the transaction to be idle
when ROLLBACK TO SAVEPOINT is attempted after an error
has been reported to the client.

MDEV-9451: Remove innodb_buffer_pool_populate from xtradb (10.2)

MySQL 5.7 introduced WL#7943: InnoDB: Implement Information_Schema.Files
to provide a long-term alternative for accessing tablespace metadata.
The INFORMATION_SCHEMA.INNODB_* views are considered internal interfaces
that are subject to change or removal between releases. So, users should
refer to I_S.FILES instead of I_S.INNODB_SYS_TABLESPACES to fetch metadata
about CREATE TABLESPACE.

Because MariaDB 10.2 does not support CREATE TABLESPACE or
CREATE TABLE…TABLESPACE for InnoDB, it does not make sense to support
I_S.FILES either. So, let MariaDB 10.2 omit the code that was added in
MySQL 5.7. After this change, I_S.FILES will report the empty result,
unless some other storage engine in MariaDB 10.2 implements the interface.
(The I_S.FILES interface was originally created for the NDB Cluster.)

MDEV-11168: InnoDB: Failing assertion: !other_lock || wsrep_thd_is_BF(lock->trx->mysql_thd, FALSE) || wsrep_thd_is_BF(other_lock->trx->mysql_thd, FALSE)

    Problem was that we moved lock request to head of lock queue
    even when lock request has to wait.

MariaDB 10.2 incorporates MySQL 5.7. MySQL 5.7.9 (the first GA release
of the series) introduced an informational field to the InnoDB redo log
header, which identifies the server version where the redo log files
were created (initialized, resized or updated), in
WL#8845: InnoDB: Redo log format version identifier.

The informational message would be displayed to the user, for example
if someone tries to start up MySQL 8.0 after killing a MariaDB 10.2 server.
In the current MariaDB 10.2 source code, the identifier string would
misleadingly say "MySQL 5.7.14" (using the hard-coded version number in
univ.i) instead of "MariaDB 10.2.3" (using the contents of the VERSION
file, the build system copies to config.h and my_config.h).

This is only a cosmetic change. The compatibility check is based on a
numeric identifier.

We should probably also change the numeric identifier and some logic
around it. MariaDB 10.2 should refuse to recover from a crashed MySQL 5.7
instance, because the redo log might contain references to shared tablespaces,
which are not supported by MariaDB 10.2. Also, when MariaDB 10.2 creates
an encrypted redo log, there should be a redo log format version tag that
will prevent MySQL 5.7 or 8.0 from starting up.

Corrected error message when ONLINE alter table with GIS indexes is
used on InnoDB.

innodb_buffer_pool_populate has not had an effect since 10.0.23
in commit 1e270d50 when its
functionality was removed.

As we've only just enabled LIBNUMA in MDEV-10829 it isn't logical
to have innodb_buffer_pool_populate aliasing for innodb_numa_interleave
this late in the game.

So the simpliest way is just to remove innodb_buffer_pool_populate.
Signed-off-by: Daniel Black <daniel.black@au.ibm.com>

The bug was fixed by the patch for mdev-10882.

The implementation of the virtual method build_clone for
the class Item_cache was missing.

        Some fixes made in innodb and item_create.cc.
        Adapted Innodb-GIS tests moved to MariaDB.

For backwards compatibility reasons.

E.g. innotop builds against libmysqlclient.so and expects to find
a libmysqlclient.so.18 library and does not use libmariadb.so.3 even
when built from our own sources.

This commit mimics to dcfe6cb8

This change was accidentally omitted from commit 2bcc16c1

As libmariadb.so.3 does not reside in a multi-arch directory (yet),
use the plain path.

This patch adds DEFAULT as a possible dynamic SQL parameter, e.g.:
  EXECUTE IMMEDIATE 'INSERT INTO t1 (column) VALUES(?)' USING DEFAULT;
  EXECUTE IMMEDIATE 'UPDATE t1 SET column=?' USING DEFAULT;
and for similar PREPARE..EXECUTE queries.

This is done for symmetry with the STMT_INDICATOR_DEFAULT indicator in
the client-server PS protocol.

The changes include:
- Allowing DEFAULT as a possible option in execute USING clause (sql_yacc.yy)
- Adding "virtual bool Item::save_in_param(THD *thd, Item_param *param)",
  because "normal" items (that have real values) and Item_default_value
  have now different actions when assigning itself as an Item_param value.
- Fixing switch() statements in a few Item_param methods not to have "default",
  because it was easy to forget to add a new "case" when adding a new XXX_VALUE
  value into the enum Item_param::enum_item_param_state.
  This is important, as we'll be adding new values soon, e.g. for MDEV-11359.
  Removing "default" helped to find and report bugs MDEV-11361 and MDEV-11362,
  because DECIMAL_VALUE is obviously not properly handled in some cases.

The fix for bug 11072 was not complete though it also fixed
the bug mdev-10800.
This patch resolves the problems of all three bugs.

Fall back to old iproute on Debian Wheezy and Ubuntu Precise that
don't have iproute2 available.

Revert the XtraDB changes, because 10.2 does not currently build with XtraDB.

Also omit some changes that need further investigation.

Ensure that all callers of partition_info::get_clone() are passing this!=NULL.

buf_block_init(): Initialize buf_page_t::flush_type.
For some reason, Valgrind 3.12.0 would seem to flag some
bits in adjacent bitfields as uninitialized, even though only
the two bits of flush_type were left uninitialized. Initialize
the field to get rid of many warnings.

buf_page_init_low(): Initialize buf_page_t::old.
For some reason, Valgrind 3.12.0 would seem to flag all 32
bits uninitialized when buf_page_init_for_read() invokes
buf_LRU_add_block(bpage, TRUE). This would trigger bogus warnings
for buf_page_t::freed_page_clock being uninitialized.
(The V-bits would later claim that only "old" is initialized
in the 32-bit word.) Perhaps recent compilers
(GCC 6.2.1 and clang 4.0.0) generate more optimized x86_64 code
for bitfield operations, confusing Valgrind?

mach_write_to_1(), mach_write_to_2(), mach_write_to_3():
Rewrite the assertions that ensure that the most significant
bits are zero. Apparently, clang 4.0.0 would optimize expressions
of the form ((n | 0xFF) <= 0x100) to (n <= 0x100). The redundant
0xFF was added in the first place in order to suppress a
Valgrind warning. (Valgrind would warn about comparing uninitialized
values even in the case when the uninitialized bits do not affect
the result of the comparison.)

In functions that declare pointer parameters as nonnull,
remove nullness checks, because GCC would optimize them away anyway.

Use #ifdef instead of #if when checking for a configuration flag.

Clang says that left shifts of negative values are undefined.
So, use ~0U instead of ~0 in a number of macros.

Some functions that were defined as UNIV_INLINE were declared as
UNIV_INTERN. Consistently use the same type of linkage.

ibuf_merge_or_delete_for_page() could pass bitmap_page=NULL to
buf_page_print(), conflicting with the __attribute__((nonnull)).

Threads may fall asleep forever while acquiring InnoDB rw-lock on Power8. This
regression was introduced along with InnoDB atomic operations fixes.

The problem was that proper memory order wasn't enforced between "writers"
store and "lock_word" load:

  my_atomic_store32((int32*) &lock->waiters, 1);
  ...
  local_lock_word = lock->lock_word;

Locking protocol is such that store to "writers" must be completed before load
of "lock_word". my_atomic_store32() was expected to enforce memory order because
it issues strongest MY_MEMORY_ORDER_SEQ_CST memory barrier.

According to C11:
- any operation with this memory order is both an acquire operation and a
  release operation
- for atomic store order must be one of memory_order_relaxed
  memory_order_release or memory_order_seq_cst. Otherwise the behavior is
  undefined.

That is it doesn't say explicitly that this expectation is wrong, but there are
indications that acquire (which is actually supposed to guarantee memory order
in this case) may not be issued along with MY_MEMORY_ORDER_SEQ_CST.

A good fix for this is to encode waiters into lock_word, but it is a bit too
intrusive. Instead we change atomic store to atomic fetch-and-store, which
does memory load and is guaranteed to issue acquire.

Simplify away recursive flag: it is not necessary for rw-locks to operate
properly. Now writer_thread != 0 means recursive.

As we only need correct value of writer_thread only in writer_thread itself
it is rather safe to load and update it non-atomically.

This patch also fixes potential reorder of "writer_thread" and "recursive"
loads (aka MDEV-7148), which was reopened along with InnoDB thread fences
simplification. Previous versions are unaffected, because they have os_rmb
in rw_lock_lock_word_decr(). It wasn't observed at the moment of writing
though.

Clean-up INNODB_RW_LOCKS_USE_ATOMICS: it is always set.

Simplified away rw_lock_get_waiters(), rw_lock_set_waiter_flag(),
rw_lock_reset_waiter_flag(). Let waiters have predictable data type.