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, 9 insertions, 9 deletions

diff --git a/storage/innobase/include/row0row.h b/storage/innobase/include/row0row.h
index 694604af408..a4d3f2cf03d 100644
--- a/storage/innobase/include/row0row.h
+++ b/storage/innobase/include/row0row.h
@@ -44,7 +44,7 @@ ulint
 row_get_trx_id_offset(
 /*==================*/
 	const dict_index_t*	index,	/*!< in: clustered index */
-	const ulint*		offsets)/*!< in: record offsets */
+	const offset_t*		offsets)/*!< in: record offsets */
 	MY_ATTRIBUTE((nonnull, warn_unused_result));
 /*********************************************************************//**
 Reads the trx id field from a clustered index record.
@@ -55,7 +55,7 @@ row_get_rec_trx_id(
 /*===============*/
 	const rec_t*		rec,	/*!< in: record */
 	const 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) */
 	MY_ATTRIBUTE((nonnull, warn_unused_result));
 /*********************************************************************//**
 Reads the roll pointer field from a clustered index record.
@@ -66,7 +66,7 @@ row_get_rec_roll_ptr(
 /*=================*/
 	const rec_t*		rec,	/*!< in: record */
 	const 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) */
 	MY_ATTRIBUTE((nonnull, warn_unused_result));
 
 /* Flags for row build type. */
@@ -138,7 +138,7 @@ row_build(
 					this record must be at least
 					s-latched and the latch held
 					as long as the row dtuple is used! */
-	const ulint*		offsets,/*!< in: rec_get_offsets(rec,index)
+	const offset_t*		offsets,/*!< in: rec_get_offsets(rec,index)
 					or NULL, in which case this function
 					will invoke rec_get_offsets() */
 	const dict_table_t*	col_table,
@@ -189,7 +189,7 @@ row_build_w_add_vcol(
 	ulint			type,
 	const dict_index_t*	index,
 	const rec_t*		rec,
-	const ulint*		offsets,
+	const offset_t*		offsets,
 	const dict_table_t*	col_table,
 	const dtuple_t*		add_cols,
 	const dict_add_v_col_t*	add_v,
@@ -206,7 +206,7 @@ row_rec_to_index_entry_low(
 /*=======================*/
 	const rec_t*		rec,	/*!< in: record in the index */
 	const dict_index_t*	index,	/*!< in: index */
-	const ulint*		offsets,/*!< in: rec_get_offsets(rec, index) */
+	const offset_t*		offsets,/*!< in: rec_get_offsets(rec, index) */
 	ulint*			n_ext,	/*!< out: number of externally
 					stored columns */
 	mem_heap_t*		heap)	/*!< in: memory heap from which
@@ -221,7 +221,7 @@ row_rec_to_index_entry(
 /*===================*/
 	const rec_t*		rec,	/*!< in: record in the index */
 	const dict_index_t*	index,	/*!< in: index */
-	const ulint*		offsets,/*!< in/out: rec_get_offsets(rec) */
+	const offset_t*		offsets,/*!< in/out: rec_get_offsets(rec) */
 	ulint*			n_ext,	/*!< out: number of externally
 					stored columns */
 	mem_heap_t*		heap)	/*!< in: memory heap from which
@@ -266,7 +266,7 @@ row_build_row_ref_in_tuple(
 					held as long as the row
 					reference is used! */
 	const dict_index_t*	index,	/*!< in: secondary index */
-	ulint*			offsets,/*!< in: rec_get_offsets(rec, index)
+	offset_t*		offsets,/*!< in: rec_get_offsets(rec, index)
 					or NULL */
 	trx_t*			trx)	/*!< in: transaction or NULL */
 	MY_ATTRIBUTE((nonnull(1,2,3)));
@@ -285,7 +285,7 @@ row_build_row_ref_fast(
 	const rec_t*	rec,	/*!< in: record in the index; must be
 				preserved while ref is used, as we do
 				not copy field values to heap */
-	const ulint*	offsets);/*!< in: array returned by rec_get_offsets() */
+	const offset_t*	offsets);/*!< in: array returned by rec_get_offsets() */
 /***************************************************************//**
 Searches the clustered index record for a row, if we have the row
 reference.