Monty's fix for Maria's table scan sometimes not seeing all rows;

without the fix, only 896 rows were inserted into t2 in maria-big.test.


storage/maria/ma_blockrec.c:
  due to wrong test we were skipping some rows when scanning
mysql-test/r/maria-big.result:
  result for new test
mysql-test/t/maria-big.test:
  test for a bug where we missed some rows when scanning

mysql-test/r/maria-big.result

+set storage_engine=maria;
+affected rows: 0
+drop table if exists t1, t2;
+affected rows: 0
+create table t1(a char(3));
+affected rows: 0
+insert into t1 values("abc");
+affected rows: 1
+insert into t1 select "def" from t1;
+affected rows: 1
+info: Records: 1  Duplicates: 0  Warnings: 0
+insert into t1 select "ghi" from t1;
+affected rows: 2
+info: Records: 2  Duplicates: 0  Warnings: 0
+insert into t1 select "jkl" from t1;
+affected rows: 4
+info: Records: 4  Duplicates: 0  Warnings: 0
+insert into t1 select "mno" from t1;
+affected rows: 8
+info: Records: 8  Duplicates: 0  Warnings: 0
+insert into t1 select "pqr" from t1;
+affected rows: 16
+info: Records: 16  Duplicates: 0  Warnings: 0
+insert into t1 select "stu" from t1;
+affected rows: 32
+info: Records: 32  Duplicates: 0  Warnings: 0
+insert into t1 select "vwx" from t1;
+affected rows: 64
+info: Records: 64  Duplicates: 0  Warnings: 0
+insert into t1 select "yza" from t1;
+affected rows: 128
+info: Records: 128  Duplicates: 0  Warnings: 0
+insert into t1 select "ceg" from t1;
+affected rows: 256
+info: Records: 256  Duplicates: 0  Warnings: 0
+insert into t1 select "ikm" from t1;
+affected rows: 512
+info: Records: 512  Duplicates: 0  Warnings: 0
+insert into t1 select "oqs" from t1;
+affected rows: 1024
+info: Records: 1024  Duplicates: 0  Warnings: 0
+select count(*) from t1;
+count(*)
+2048
+affected rows: 1
+insert into t1 select "uwy" from t1;
+affected rows: 2048
+info: Records: 2048  Duplicates: 0  Warnings: 0
+create table t2 select * from t1;
+affected rows: 4096
+info: Records: 4096  Duplicates: 0  Warnings: 0
+select count(*) from t1;
+count(*)
+4096
+affected rows: 1
+select count(*) from t2;
+count(*)
+4096
+affected rows: 1
+drop table t1, t2;
+affected rows: 0

mysql-test/t/maria-big.test

+# Test of scenarios potentially too big for --valgrind or --mem
+enable_info;
+set storage_engine=maria;
+disable_warnings;
+drop table if exists t1, t2;
+enable_warnings;
+create table t1(a char(3));
+insert into t1 values("abc");
+insert into t1 select "def" from t1;
+insert into t1 select "ghi" from t1;
+insert into t1 select "jkl" from t1;
+insert into t1 select "mno" from t1;
+insert into t1 select "pqr" from t1;
+insert into t1 select "stu" from t1;
+insert into t1 select "vwx" from t1;
+insert into t1 select "yza" from t1;
+insert into t1 select "ceg" from t1;
+insert into t1 select "ikm" from t1;
+insert into t1 select "oqs" from t1;
+select count(*) from t1;
+insert into t1 select "uwy" from t1;
+create table t2 select * from t1;
+select count(*) from t1;
+select count(*) from t2;
+drop table t1, t2;
+disable_info;

storage/maria/ma_blockrec.c

@@ -3454,7 +3454,8 @@ restart_bitmap_scan:
       for (data+= 6; data < info->scan.bitmap_end; data+= 6)
       {
         bits= uint6korr(data);
-        if (bits && ((bits & LL(04444444444444444)) != LL(04444444444444444)))
+        /* Skip not allocated pages and blob / full tail pages */
+        if (bits && bits != LL(07777777777777777))
           break;
       }
       bit_pos= 0;