Adjust some results and error codes.

        Support for '**' in json path expressions added.

Merge branch '10.2-MDEV-9872-crc32-generic-message' of https://github.com/grooverdan/mariadb-server into grooverdan-10.2-MDEV-9872-crc32-generic-message

MDEV-11075: changing to algorithm innodb from crc32

With innodb compressed pages formerly as crc32 changing to the
innodb checksum, optimize for speed by only calcuating the big
endian variant of crc32 after checking that the little endian
doesn't validate the page.
Signed-off-by: Daniel Black <daniel.black@au.ibm.com>

MDEV-11422 rpl.rpl_parallel_optimistic_nobinlog failed in buildbot with "InnoDB: Killing connection failed Deadlock"

innobase_kill_query(): Remove the bogus warning message
(for the valid outcome err==DB_DEADLOCK) that was added in

commit fec844ac
Author: Jan Lindström <jan.lindstrom@mariadb.com>
Date:   Tue Sep 6 09:43:16 2016 +0300

    Merge InnoDB 5.7 from mysql-5.7.14.

Also, remove some redundant variables and add a debug assertion for
enforcing the proper outcome of lock_trx_handle_wait().

buffer pool size

The reason for the exception is previous overflow in multiplication of
two 32bit integers (product was 0 rather than expected 8GB, due
to truncation)

        When the json was just a scalar value, json_extract tried
        to parse after the value ended.

        Test case added.

        Test case added.

        Item_func_json_merge fixed.

        'JSON' made possible identifier.

        Now return the argument's value when error.

Merge pull request #268 from grooverdan/10.2-MDEV-10651-enable-test-sys_vars.innodb_buffer_pool_dump_pct_basic

MDEV-10651: enable test sys_vars.innodb_buffer_pool_dump_pct_basic

MDEV-11451: isinf || isnan -> !isfinite

crashes server

This bug is the result of merging the Oracle MySQL follow-up fix
BUG#22963169 MYSQL CRASHES ON CREATE FULLTEXT INDEX
without merging the base bug fix:
Bug#79475 Insert a token of 84 4-bytes chars into fts index causes
server crash.

Unlike the above mentioned fixes in MySQL, our fix will not change
the storage format of fulltext indexes in InnoDB or XtraDB
when a character encoding with mbmaxlen=2 or mbmaxlen=3
and the length of a word is between 128 and 84*mbmaxlen bytes.
The Oracle fix would allocate 2 length bytes for these cases.

Compatibility with other MySQL and MariaDB releases is ensured by
persisting the used maximum length in the SYS_COLUMNS table in the
InnoDB data dictionary.

This fix also removes some unnecessary strcmp() calls when checking
for the legacy default collation my_charset_latin1
(my_charset_latin1.name=="latin1_swedish_ci").

fts_create_one_index_table(): Store the actual length in bytes.
This metadata will be written to the SYS_COLUMNS table.

fts_zip_initialize(): Initialize only the first byte of the buffer.
Actually the code should not even care about this first byte, because
the length is set as 0.

FTX_MAX_WORD_LEN: Define as HA_FT_MAXCHARLEN * 4 aka 336 bytes,
not as 254 bytes.

row_merge_create_fts_sort_index(): Set the actual maximum length of the
column in bytes, similar to fts_create_one_index_table().

row_merge_fts_doc_tokenize(): Remove the redundant parameter word_dtype.
Use the actual maximum length of the column. Calculate the extra_size
in the same way as row_merge_buf_encode() does.

        Item_func_json_extract::val_str fixed.

        Item_func_json_length::val_int fixed.

        Test case added.

        Item_func_json_array_append::val_str fixed.

        Item_func_json_array_insert::val_str fixed.

        Item_func_json_remove::val_str fixed.

        Item_func_json_depth::val_int fixed.

Since 10.2 (2e814d47) this test
changed and the race condition of MDEV-10651 no longer forms part
of this test.

As such re-enable this test.

Also include save/restore of the default values of this variable.
Signed-off-by: Daniel Black <daniel.black@au.ibm.com>

There are only 3 logical states for a number. The isfinite is a
single function call rather than multiple leaving scope for compiler
/architecture optimization.

Changed the logic as follows in a few files.

my_isinf(square) || my_isnan(square) -> !isfinite(square)
Signed-off-by: Daniel Black <daniel.black@au.ibm.com>

We don't need to drop down to unoptimized crc because of valgrind now.

Valgrind-3.6.1 was released 16 February 2011.

The Power8 ASM instructions seem to be supported in 3.9.0 (31 October 2013).
Signed-off-by: Daniel Black <daniel.black@au.ibm.com>

        Integer/Double recognition added.

        Create_func_json_contains::create_native fixed.

        Create_func_json_merge::create_native fixed.

        json_quote fixed.

        fix_length_and_dec() didn't calculate the length of the result
        properly.

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.