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mariadb/sql
Monty c37016b0e5 Fixed internal temporary buffer sizes to use tmp_memory_table_size
tmp_memory_table_size is limiting the size of internal temporary memory
tables. max_heap_table_size is there to limiting the size of explictely
created memory tables. max_heap_table_size can be much larger than
tmp_memory_table_size as the memory used by temporary tables is in the
control of the user.

This commit changes the usage of max_heap_table_size for internal buffers
to min(max_heap_table_size, tmp_memory_table_size), like we do for
internal temporary tables.

This changes the in memory buffer allocations for:
- GROUP_CONCAT()
- Calculating the cost for scanning memory tables (the original code was
  wrong here as it used the wrong size for memory tables).
- ANALYZE TABLE buffer sizes for calculating distinct column values

Other things:
- Add THD::ram_limitation() to provide consistent memory limitations
  in all code that used variables.tmp_memory_table_size as buffers.
  If tmp_memory_table_size == 0, then 8192 is used.
  This replaces Item_sum::ram_limitation which used 1024 as min buffer,
  which is way to little for any practical case.
- Added security guard in heap_prepare_hp_create_info to ensure that
  max_table_size is calculated same way as in MariaDB server.
- Fixed initial memory allocations for Item_func_group::concat which
  allocated 'max allowed memory' at start. Now it allocates only 1/16
  of that memory at start.
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