MDEV-20950 Reduce size of record offsetsbb-10.2-MDEV-20950-stack-offsets

offset_t: this is a type which represents one record offset.
It's unsigned short int.

a lot of functions: replace ulint with offset_t

btr_pcur_restore_position_func(),
page_validate(),
row_ins_scan_sec_index_for_duplicate(),
row_upd_clust_rec_by_insert_inherit_func(),
row_vers_impl_x_locked_low(),
trx_undo_prev_version_build():
  allocate record offsets on the stack instead of waiting for rec_get_offsets()
  to allocate it from mem_heap_t. So, reducing  memory allocations.

RECORD_OFFSET, INDEX_OFFSET:
  now it's less convenient to store pointers in offset_t*
  array. One pointer occupies now several offset_t. And those constant are start
  indexes into array to places where to store pointer values

REC_OFFS_HEADER_SIZE: adjusted for the new reality

REC_OFFS_NORMAL_SIZE:
  increase size from 100 to 300 which means less heap allocations.
  And sizeof(offset_t[REC_OFFS_NORMAL_SIZE]) now is 600 bytes which
  is smaller than previous 800 bytes.

REC_OFFS_SEC_INDEX_SIZE: adjusted for the new reality

rem0rec.h, rem0rec.ic, rem0rec.cc:
  various arguments, return values and local variables types were changed to
  fix numerous integer conversions issues.

enum field_type_t:
  offset types concept was introduces which replaces old offset flags stuff.
  Like in earlier version, 2 upper bits are used to store offset type.
  And this enum represents those types.

REC_OFFS_SQL_NULL, REC_OFFS_MASK: removed

get_type(), set_type(), get_value(), combine():
  these are convenience functions to work with offsets and it's types

rec_offs_base()[0]:
  still uses an old scheme with flags REC_OFFS_COMPACT and REC_OFFS_EXTERNAL

rec_offs_base()[i]:
  these have type offset_t now. Two upper bits contains type.

1 files changed, 1 insertions, 1 deletions

diff --git a/storage/innobase/include/row0upd.ic b/storage/innobase/include/row0upd.ic
index 64f08cbb0b2..68280ff567a 100644
--- a/storage/innobase/include/row0upd.ic
+++ b/storage/innobase/include/row0upd.ic
@@ -163,7 +163,7 @@ row_upd_rec_sys_fields(
 	page_zip_des_t*	page_zip,/*!< in/out: compressed page whose
 				uncompressed part will be updated, or NULL */
 	dict_index_t*	index,	/*!< in: clustered index */
-	const ulint*	offsets,/*!< in: rec_get_offsets(rec, index) */
+	const offset_t*	offsets,/*!< in: rec_get_offsets(rec, index) */
 	const trx_t*	trx,	/*!< in: transaction */
 	roll_ptr_t	roll_ptr)/*!< in: DB_ROLL_PTR to the undo log */
 {