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, 2 insertions, 1 deletions

diff --git a/storage/innobase/include/row0ftsort.h b/storage/innobase/include/row0ftsort.h
index 1c1357e330b..73f815604d8 100644
--- a/storage/innobase/include/row0ftsort.h
+++ b/storage/innobase/include/row0ftsort.h
@@ -30,6 +30,7 @@ Created 10/13/2010 Jimmy Yang
 #include "data0data.h"
 #include "fts0fts.h"
 #include "fts0priv.h"
+#include "rem0types.h"
 #include "row0merge.h"
 #include "btr0bulk.h"
 
@@ -247,7 +248,7 @@ row_merge_fts_sel_propagate(
 	int*		sel_tree,	/*<! in: selection tree */
 	ulint		level,		/*<! in: selection tree level */
 	const mrec_t**	 mrec,		/*<! in: sort record */
-	ulint**		offsets,	/*<! in: record offsets */
+	offset_t**	offsets,	/*<! in: record offsets */
 	dict_index_t*	index);		/*<! in: FTS index */
 /********************************************************************//**
 Read sorted file containing index data tuples and insert these data