Moved some old test and added a new test to only be run with mysql-test-run --big

Fixed warnings by valgrind for sum_distinct.test
Enable buffered-record-reads after filesort for InnoDB tables with short primary key
Enabled sort-with-data for MyISAM temporary files


BitKeeper/etc/ignore:
  added tools/mysqltestmanager
client/mysqltest.c:
  Ensure that BIG_TEST is always set to 0 or 1
  Fix the 'eval' also honors 'require'
mysql-test/mysql-test-run.sh:
  Enlarge InnoDB table space for --big tests
mysql-test/r/heap.result:
  Fix after adding more optimzation for filsort
mysql-test/r/sum_distinct.result:
  Move 'slow' part of test to sum_distinct-big.test
mysql-test/t/heap.test:
  Ensure that results are indpendent of optimizer
mysql-test/t/sum_distinct.test:
  Move 'slow' part of test to sum_distinct-big.test
sql/filesort.cc:
  Use 'sort with data' also on temporary files and with INSERT ... SELECT
sql/ha_innodb.h:
  Remove HA_FAST_KEY_READ to enable buffered-record-reads after filesort
sql/handler.h:
  More comments
sql/mysql_priv.h:
  A bit smaller limit for cache for buffered-records-read (after testing)
sql/records.cc:
  Don't use buffered-record-reads if ref_length > MAX_REFLENGTH
  Fixed warning from valgrind in 'sum_distinct'
sql/sql_select.cc:
  Ensure that tempory tables has query_id set for all fields
  (Required for sort-with-data to work on temp files)

1 files changed, 67 insertions, 0 deletions

diff --git a/mysql-test/t/sum_distinct-big.test b/mysql-test/t/sum_distinct-big.test
new file mode 100644
index 00000000000..0859f4b3d89
--- /dev/null
+++ b/mysql-test/t/sum_distinct-big.test
@@ -0,0 +1,67 @@
+#
+# Various tests for SUM(DISTINCT ...)
+#
+
+--source include/big_test.inc
+--disable_warnings
+DROP TABLE IF EXISTS t1, t2;
+--enable_warnings
+
+#
+# Test the case when distinct values doesn't fit in memory and 
+# filesort is used (see uniques.cc:merge_walk)
+#
+
+CREATE TABLE t1 (id INTEGER);
+CREATE TABLE t2 (id INTEGER);
+
+INSERT INTO t1 (id) VALUES (1), (1), (1),(1);
+INSERT INTO t1 (id) SELECT id FROM t1; /* 8 */
+INSERT INTO t1 (id) SELECT id FROM t1; /* 12 */
+INSERT INTO t1 (id) SELECT id FROM t1; /* 16 */
+INSERT INTO t1 (id) SELECT id FROM t1; /* 20 */
+INSERT INTO t1 (id) SELECT id FROM t1; /* 24 */
+INSERT INTO t1 SELECT id+1 FROM t1;
+INSERT INTO t1 SELECT id+2 FROM t1;
+INSERT INTO t1 SELECT id+4 FROM t1;
+INSERT INTO t1 SELECT id+8 FROM t1;
+INSERT INTO t1 SELECT id+16 FROM t1;
+INSERT INTO t1 SELECT id+32 FROM t1;
+INSERT INTO t1 SELECT id+64 FROM t1;
+INSERT INTO t1 SELECT id+128 FROM t1;
+INSERT INTO t1 SELECT id+256 FROM t1;
+INSERT INTO t1 SELECT id+512 FROM t1;
+
+# Just test that AVG(DISTINCT) is there
+SELECT AVG(DISTINCT id) FROM t1 GROUP BY id % 13;
+SELECT SUM(DISTINCT id)/COUNT(DISTINCT id) FROM t1 GROUP BY id % 13;
+
+INSERT INTO t1 SELECT id+1024 FROM t1;
+INSERT INTO t1 SELECT id+2048 FROM t1;
+INSERT INTO t1 SELECT id+4096 FROM t1;
+INSERT INTO t1 SELECT id+8192 FROM t1;
+INSERT INTO t2 SELECT id FROM t1 ORDER BY id*rand();
+
+# SELECT '++++++++++++++++++++++++++++++++++++++++++++++++++';
+
+SELECT SUM(DISTINCT id) sm FROM t1;
+SELECT SUM(DISTINCT id) sm FROM t2;
+SELECT SUM(DISTINCT id) sm FROM t1 group by id % 13;
+
+# this limit for max_heap_table_size is set to force testing the case, when
+# all distinct sum values can not fit in memory and must be stored in a
+# temporary table
+
+SET max_heap_table_size=16384;
+
+# to check that max_heap_table_size was actually set (hard limit for minimum
+# max_heap_table_size is set in mysqld.cc):
+
+SHOW variables LIKE 'max_heap_table_size';
+
+SELECT SUM(DISTINCT id) sm FROM t1;
+SELECT SUM(DISTINCT id) sm FROM t2;
+SELECT SUM(DISTINCT id) sm FROM t1 GROUP BY id % 13;
+
+DROP TABLE t1;
+DROP TABLE t2;