message: update unit test: art leaf node's shrink.
diff: @@ -86,7 +86,7 @@ SELECT COUNT(*) FROM integers
  ----
  0
  -# insert 3000 elements
  +# insert 3000 elements: 1
  loop i 0 3000
  statement ok
  @@ -94,6 +94,14 @@ INSERT INTO integers VALUES (1);
  endloop
  +# insert 1024 elements: 2
  +loop i 0 1024
  +
  +statement ok
  +INSERT INTO integers VALUES (2);
  +
  +endloop
  +
  # verify counts
  query I
  @@ -101,14 +109,41 @@ SELECT COUNT(*) FROM integers WHERE i = 1
  ----
  3000
  +query I
  +SELECT COUNT(*) FROM integers WHERE i = 2
  +----
  +1024
  +
  +query I
  +SELECT COUNT(*) FROM integers WHERE i <= 2
  +----
  +4024
  +
  # verify sums
  query I
  SELECT sum(i) FROM integers WHERE i <= 2
  ----
  +5048
  +
  +# now delete all elements: 2
  +
  +statement ok
  +DELETE FROM integers WHERE i = 2
  +
  +# verify counts
  +
  +query I
  +SELECT COUNT(*) FROM integers WHERE i = 1
  +----
  3000
  -# now delete all elements
  +query I
  +SELECT COUNT(*) FROM integers
  +----
  +3000
  +
  +# now delete all elements: 1
  statement ok
  DELETE FROM integers WHERE i = 1
  