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>

        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.

        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)