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, 11 insertions, 10 deletions

diff --git a/storage/innobase/include/gis0rtree.h b/storage/innobase/include/gis0rtree.h
index e5942b71c64..ffb6beb922b 100644
--- a/storage/innobase/include/gis0rtree.h
+++ b/storage/innobase/include/gis0rtree.h
@@ -28,6 +28,7 @@ Created 2013/03/27 Jimmy Yang and Allen Lai
 #define gis0rtree_h
 
 #include "btr0cur.h"
+#include "rem0types.h"
 
 /* Whether MBR 'a' contains 'b' */
 #define	MBR_CONTAIN_CMP(a, b)					\
@@ -90,7 +91,7 @@ rtr_page_split_and_insert(
 	btr_cur_t*	cursor,	/*!< in/out: cursor at which to insert; when the
 				function returns, the cursor is positioned
 				on the predecessor of the inserted record */
-	ulint**		offsets,/*!< out: offsets on inserted record */
+	offset_t**	offsets,/*!< out: offsets on inserted record */
 	mem_heap_t**	heap,	/*!< in/out: pointer to memory heap, or NULL */
 	const dtuple_t*	tuple,	/*!< in: tuple to insert */
 	ulint		n_ext,	/*!< in: number of externally stored columns */
@@ -152,7 +153,7 @@ rtr_rec_cal_increase(
 				dtuple in some of the common fields, or which
 				has an equal number or more fields than
 				dtuple */
-	const ulint*	offsets,/*!< in: array returned by rec_get_offsets() */
+	const offset_t*	offsets,/*!< in: array returned by rec_get_offsets() */
 	double*		area);	/*!< out: increased area */
 
 /****************************************************************//**
@@ -276,7 +277,7 @@ void
 rtr_get_mbr_from_rec(
 /*=================*/
 	const rec_t*	rec,	/*!< in: data tuple */
-	const ulint*	offsets,/*!< in: offsets array */
+	const offset_t*	offsets,/*!< in: offsets array */
 	rtr_mbr_t*	mbr);	/*!< out MBR */
 
 /****************************************************************//**
@@ -308,10 +309,10 @@ rtr_page_get_father(
 Returns the father block to a page. It is assumed that mtr holds
 an X or SX latch on the tree.
 @return rec_get_offsets() of the node pointer record */
-ulint*
+offset_t*
 rtr_page_get_father_block(
 /*======================*/
-	ulint*		offsets,/*!< in: work area for the return value */
+	offset_t*	offsets,/*!< in: work area for the return value */
 	mem_heap_t*	heap,	/*!< in: memory heap to use */
 	dict_index_t*	index,	/*!< in: b-tree index */
 	buf_block_t*	block,	/*!< in: child page in the index */
@@ -418,8 +419,8 @@ rtr_merge_and_update_mbr(
 /*=====================*/
 	btr_cur_t*		cursor,		/*!< in/out: cursor */
 	btr_cur_t*		cursor2,	/*!< in: the other cursor */
-	ulint*			offsets,	/*!< in: rec offsets */
-	ulint*			offsets2,	/*!< in: rec offsets */
+	offset_t*		offsets,	/*!< in: rec offsets */
+	offset_t*		offsets2,	/*!< in: rec offsets */
 	page_t*			child_page,	/*!< in: the child page. */
 	buf_block_t*		merge_block,	/*!< in: page to merge */
 	buf_block_t*		block,		/*!< in: page be merged */
@@ -444,8 +445,8 @@ rtr_merge_mbr_changed(
 /*==================*/
 	btr_cur_t*	cursor,		/*!< in: cursor */
 	btr_cur_t*	cursor2,	/*!< in: the other cursor */
-	ulint*		offsets,	/*!< in: rec offsets */
-	ulint*		offsets2,	/*!< in: rec offsets */
+	offset_t*	offsets,	/*!< in: rec offsets */
+	offset_t*	offsets2,	/*!< in: rec offsets */
 	rtr_mbr_t*	new_mbr,	/*!< out: MBR to update */
 	buf_block_t*	merge_block,	/*!< in: page to merge */
 	buf_block_t*	block,		/*!< in: page be merged */
@@ -459,7 +460,7 @@ bool
 rtr_update_mbr_field(
 /*=================*/
 	btr_cur_t*	cursor,		/*!< in: cursor pointed to rec.*/
-	ulint*		offsets,	/*!< in: offsets on rec. */
+	offset_t*	offsets,	/*!< in: offsets on rec. */
 	btr_cur_t*	cursor2,	/*!< in/out: cursor pointed to rec
 					that should be deleted.
 					this cursor is for btr_compress to