Added version_source_revision server "variable", for the git revision.
Also , mysql -V will show git revision.

"make dist" will now pack source_revision.h into the source package.

followup for b5ead3a6

libmariadb3 does not replace 10.1's libmariadbclient18 anymore,
but it still conflicts with it, both install dialog.so

This fixes a regression that only affects debug builds, caused by
commit 48192f96 which is necessary
preparation for MDEV-11369 instant ADD COLUMN. (Although that is a
10.3 task, to ease merges between 10.2 and 10.3, this change that
improves debug checks was pushed to 10.2 already.)

Unlike btr_pcur_restore_position(), rtr_cur_restore_position()
can create a search tuple out of a non-leaf page record. So,
we must pass 'bool leaf' parameter to dict_index_build_data_tuple().

dict_index_build_data_tuple(): Add a debug-only parameter 'bool leaf'.

rec_copy_prefix_to_dtuple(): Make the parameter debug-only.

row_sel_get_clust_rec_for_mysql(): In the debug code for spatial index,
remove an unnecessary call to buf_page_get_gen(), and use the already
latched block directly.

MDEV-13851 Always check table options in ALTER TABLE…ALGORITHM=INPLACE

In the merge of MySQL 5.7.9 to MariaDB 10.2.2, some code was included
that prevents ADD SPATIAL INDEX from being executed with ALGORITHM=INPLACE.

Also, the constant ADD_SPATIAL_INDEX was introduced as an alias
to ADD_INDEX. We will remove that alias now, and properly implement
the same ADD SPATIAL INDEX restrictions as MySQL 5.7 does:

1. table-rebuilding operations are not allowed if SPATIAL INDEX survive it
2. ALTER TABLE…ADD SPATIAL INDEX…LOCK=NONE is not allowed

ha_innobase::prepare_inplace_alter_table(): If the ALTER TABLE
requires actions within InnoDB, enforce the table options (MDEV-13851).
In this way, we will keep denying ADD SPATIAL INDEX for tables
that use encryption (MDEV-11974), even if ALGORITHM=INPLACE is used.

This should affect debug builds only. Debug builds will check that
the status bits of ROW_FORMAT!=REDUNDANT records match the is_leaf
parameter.

The only observable change to non-debug should be the addition of
the is_leaf parameter to the function rec_copy_prefix_to_dtuple(),
and the removal of some calls to update the adaptive hash index
(it is only built for the leaf pages).

This change should have been made in MySQL 5.0.3, instead of
introducing the status flags in the ROW_FORMAT=COMPACT record header.

The only universal index in InnoDB was the change buffer.
It suffices to keep the DICT_IBUF flag (which, like DICT_UNIVERSAL,
is not written to any persistent data structure).

The function check_mdl_lock_works() is for debug builds only.

Define some page accessor functions inline in page0page.h,
reducing code duplication in page0page.ic.

Use page_rec_is_leaf() instead of page_is_leaf() where possible.

It is only valid for 10.1

MDEV-13290: Assertion Assertion `!is_set() || (m_status == DA_OK_BULK && is_bulk_op())' or `! is_set()' failed

Check error status which can be set by conversion procedures.

When creating an Item_direct_view_ref we were setting the
Name_resolution_context based on TABLE_LIST::view member variable.
However, for derived tables this member is NULL. To not set a wrong
context, if TABLE_LIST::view is empty, use THD::lex instead.

Window functions can not be used as arguments to aggregate functions, as
the aggregation happens before window function computation. Disallow
such constructs by returning an error.

In order to detect this case a change was needed in the base
Item_sum_xxx::fix_fields to propagate the with_window_func flag.

Item_func_group_concat requires the same change.

Item_cond did not correctly propagate with_window_func flag in the Item
tree. Without it, we would not call Item::split_sum_func correctly and the
window function's result_field would remain NULL.

This is backport of 25ad623d for 10.2.

The issue is similar to the one from MDEV-13240. Item::save_in_field()
returns an error during tmp table population in a create table from select query
as we try to save an empty string as a date value when
force_return_blank is set to true for window functions.

    MDEV-13240 Wrong warning with MAX(datetime_field) OVER (...)

    The problem resided in Item_window_func implementation,
    and it was revealed by bb-10.2-ext specific changes:

    Item_window_func::save_in_field() works differently in bb-10.2-ext vs 10.2:

    - 10.2 goes through val_str()
    - bb-10.2-ext goes through get_date(), due to Type_handler related changes.
      get_date() tries to convert empty string to DATETIME, hence the warning.

    During a discussion with Vicentiu, it was decided to fix
    Item_window_func::val_xxx() to return NULL
    (instead of an "empty" value, such as 0 for numbers and '' for strings)
    when force_return_blank is set.

        The MySQL 5.6 doesn't always send the MYSQL_AUDIT_GENERAL_LOG
        notification. So we have to suppress the log_current_query()
        in this case.

        The MySQL 5.6 doesn't always send the MYSQL_AUDIT_GENERAL_LOG
        notification. So we have to suppress the log_current_query()
        in this case.

Revert Bug #25175249  ASSERTION: (TEMPL->IS_VIRTUAL && !FIELD) || (FIELD && FIELD->PREFIX_LEN ? FIELD

We don't want this in innodb/xtradb