InnoDB: Improve performance by about 10% by removing implicit

memcpy() calls, by not initializing the offsets_[] arrays.
InnoDB: Remove a Microsoft compiler warning in page0page.c.


innobase/btr/btr0btr.c:
  Only initialize the first element of offsets_[]
innobase/btr/btr0cur.c:
  Only initialize the first element of offsets_[]
innobase/btr/btr0sea.c:
  Only initialize the first element of offsets_[]
innobase/lock/lock0lock.c:
  Only initialize the first element of offsets_[]
innobase/page/page0cur.c:
  Only initialize the first element of offsets_[]
innobase/page/page0page.c:
  page_validate(): Silence a warning about unsigned/signed comparison.
  Other places: Only initialize the first element of offsets_[].
innobase/rem/rem0rec.c:
  Only initialize the first element of offsets_[]
innobase/row/row0ins.c:
  Only initialize the first element of offsets_[]
innobase/row/row0mysql.c:
  Only initialize the first element of offsets_[]
innobase/row/row0purge.c:
  Only initialize the first element of offsets_[]
innobase/row/row0row.c:
  Only initialize the first element of offsets_[]
innobase/row/row0sel.c:
  Only initialize the first element of offsets_[]
innobase/row/row0undo.c:
  Only initialize the first element of offsets_[]
innobase/row/row0upd.c:
  Only initialize the first element of offsets_[]
innobase/trx/trx0rec.c:
  Only initialize the first element of offsets_[]

1 files changed, 2 insertions, 1 deletions

diff --git a/innobase/row/row0undo.c b/innobase/row/row0undo.c
index d994eab9873..895303e361c 100644
--- a/innobase/row/row0undo.c
+++ b/innobase/row/row0undo.c
@@ -152,8 +152,9 @@ row_undo_search_clust_to_pcur(
 	ibool		ret;
 	rec_t*		rec;
 	mem_heap_t*	heap		= NULL;
-	ulint		offsets_[100]	= { 100, };
+	ulint		offsets_[100];
 	ulint*		offsets		= offsets_;
+	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
 
 	mtr_start(&mtr);