Merge from mysql-5.1-innodb:

  ------------------------------------------------------------
  revno: 3438
  revision-id: marko.makela@oracle.com-20100504105546-4ew7a77e9uhxmhho
  parent: marko.makela@oracle.com-20100504093128-44v6glupe1dsh0ug
  committer: Marko M?kel? <marko.makela@oracle.com>
  branch nick: 5.1-innodb
  timestamp: Tue 2010-05-04 13:55:46 +0300
  message:
    Remove UNIV_BTR_AVOID_COPY. It was broken because btr_attach_half_pages()
    would get the block, new_block in the wrong order.
    Fixing that would have complicated the function even further
    for this marginal case.
  modified:
    storage/innodb_plugin/ChangeLog 2425@16c675df-0fcb-4bc9-8058-dcc011a37293:branches%2Fzip%2FChangeLog
    storage/innodb_plugin/btr/btr0btr.c 2@16c675df-0fcb-4bc9-8058-dcc011a37293:trunk%2Fbtr%2Fbtr0btr.c
    storage/innodb_plugin/include/univ.i 2@16c675df-0fcb-4bc9-8058-dcc011a37293:trunk%2Finclude%2Funiv.i
  ------------------------------------------------------------

storage/innobase/btr/btr0btr.c

@@ -2050,17 +2050,7 @@ insert_empty:
 	}
 
 	/* 5. Move then the records to the new page */
-	if (direction == FSP_DOWN
-#ifdef UNIV_BTR_AVOID_COPY
-	    && page_rec_is_supremum(move_limit)) {
-		/* Instead of moving all records, make the new page
-		the empty page. */
-
-		left_block = block;
-		right_block = new_block;
-	} else if (direction == FSP_DOWN
-#endif /* UNIV_BTR_AVOID_COPY */
-		   ) {
+	if (direction == FSP_DOWN) {
 		/*		fputs("Split left\n", stderr); */
 
 		if (0
@@ -2103,14 +2093,6 @@ insert_empty:
 		right_block = block;
 
 		lock_update_split_left(right_block, left_block);
-#ifdef UNIV_BTR_AVOID_COPY
-	} else if (!split_rec) {
-		/* Instead of moving all records, make the new page
-		the empty page. */
-
-		left_block = new_block;
-		right_block = block;
-#endif /* UNIV_BTR_AVOID_COPY */
 	} else {
 		/*		fputs("Split right\n", stderr); */
 

storage/innobase/include/univ.i

@@ -222,10 +222,6 @@ operations (very slow); also UNIV_DEBUG must be defined */
 						adaptive hash index */
 #define UNIV_SRV_PRINT_LATCH_WAITS		/* enable diagnostic output
 						in sync0sync.c */
-#define UNIV_BTR_AVOID_COPY			/* when splitting B-tree nodes,
-						do not move any records when
-						all the records would
-						be moved */
 #define UNIV_BTR_PRINT				/* enable functions for
 						printing B-trees */
 #define UNIV_ZIP_DEBUG				/* extensive consistency checks