Bug #13601: Wrong int type for bit

  The wrong value was being reported as the field_length for BIT
  fields, resulting in confusion for at least Connector/J. The
  field_length is now always the number of bits in the field, as
  it should be.


mysql-test/r/type_bit.result:
  Add new results
mysql-test/r/type_bit_innodb.result:
  Add new results
mysql-test/t/type_bit.test:
  Add new regression test
mysql-test/t/type_bit_innodb.test:
  Add new regression test
sql/field.cc:
  Fix Field_bit->field_length to actually report the display width, and
  store the bytes stored in the rec in the new bytes_in_rec member.
sql/field.h:
  Fix Field_bit::field_length to store the correct value, adding
  Field_bit::bytes_in_rec to remember the number of bytes used for
  storing the value. Remove Field_bit_as_char::create_length, as it
  is now redundant.
sql/ha_ndbcluster.cc:
  Handle field_length of Field_bit actually being the display width (# of bits).
sql/key.cc:
  Fix inappropriate use of field->field_length for BIT field.

mysql-test/r/type_bit.result

@@ -564,3 +564,12 @@ b1+0	sum(b1)	sum(b2)
 1	4	4
 2	2	2
 drop table t1, t2;
+create table t1 (a bit(7));
+insert into t1 values (0x60);
+select * from t1;
+Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def	test	t1	t1	a	a	16	7	1	Y	0	0	63
+a
+`
+drop table t1;
+End of 5.0 tests

mysql-test/r/type_bit_innodb.result

@@ -402,3 +402,12 @@ t1	CREATE TABLE `t1` (
   `b` bit(10) default NULL
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1
 drop table t1;
+create table t1 (a bit(7)) engine=innodb;
+insert into t1 values (0x60);
+select * from t1;
+Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
+def	test	t1	t1	a	a	16	7	1	Y	0	0	63
+a
+`
+drop table t1;
+End of 5.0 tests

mysql-test/t/type_bit.test

@@ -227,3 +227,15 @@ select sum(a1), b1+0, b2+0 from t1 join t2 on b1 = b2 group by b1 order by 1;
 select 1 from t1 join t2 on b1 = b2 group by b1 order by 1;
 select b1+0,sum(b1), sum(b2) from t1 join t2 on b1 = b2 group by b1 order by 1;
 drop table t1, t2;
+
+#
+# Bug #13601: Wrong field length reported for BIT fields
+#
+create table t1 (a bit(7));
+insert into t1 values (0x60);
+--enable_metadata
+select * from t1;
+--disable_metadata
+drop table t1;
+
+--echo End of 5.0 tests

mysql-test/t/type_bit_innodb.test

@@ -133,3 +133,15 @@ show create table t1;
 alter table t1 engine=innodb;
 show create table t1;
 drop table t1;
+
+#
+# Bug #13601: Wrong field length reported for BIT fields
+#
+create table t1 (a bit(7)) engine=innodb;
+insert into t1 values (0x60);
+--enable_metadata
+select * from t1;
+--disable_metadata
+drop table t1;
+
+--echo End of 5.0 tests

sql/field.cc

@@ -7918,9 +7918,10 @@ Field_bit::Field_bit(char *ptr_arg, uint32 len_arg, uchar *null_ptr_arg,
                      uchar null_bit_arg, uchar *bit_ptr_arg, uchar bit_ofs_arg,
                      enum utype unireg_check_arg, const char *field_name_arg,
                      struct st_table *table_arg)
-  : Field(ptr_arg, len_arg >> 3, null_ptr_arg, null_bit_arg,
+  : Field(ptr_arg, len_arg, null_ptr_arg, null_bit_arg,
           unireg_check_arg, field_name_arg, table_arg),
-    bit_ptr(bit_ptr_arg), bit_ofs(bit_ofs_arg), bit_len(len_arg & 7)
+    bit_ptr(bit_ptr_arg), bit_ofs(bit_ofs_arg), bit_len(len_arg & 7),
+    bytes_in_rec(len_arg / 8)
 {
   /*
     Ensure that Field::eq() can distinguish between two different bit fields.
@@ -7956,14 +7957,14 @@ int Field_bit::store(const char *from, uint length, CHARSET_INFO *cs)
   int delta;
 
   for (; length && !*from; from++, length--);          // skip left 0's
-  delta= field_length - length;
+  delta= bytes_in_rec - length;
 
   if (delta < -1 ||
       (delta == -1 && (uchar) *from > ((1 << bit_len) - 1)) ||
       (!bit_len && delta < 0))
   {
     set_rec_bits(0xff, bit_ptr, bit_ofs, bit_len);
-    memset(ptr, 0xff, field_length);
+    memset(ptr, 0xff, bytes_in_rec);
     if (table->in_use->really_abort_on_warning())
       set_warning(MYSQL_ERROR::WARN_LEVEL_ERROR, ER_DATA_TOO_LONG, 1);
     else
@@ -7991,7 +7992,7 @@ int Field_bit::store(const char *from, uint length, CHARSET_INFO *cs)
       set_rec_bits((uchar) *from, bit_ptr, bit_ofs, bit_len);
       from++;
     }
-    memcpy(ptr, from, field_length);
+    memcpy(ptr, from, bytes_in_rec);
   }
   return 0;
 }
@@ -8032,10 +8033,10 @@ longlong Field_bit::val_int(void)
   if (bit_len)
   {
     bits= get_rec_bits(bit_ptr, bit_ofs, bit_len);
-    bits<<= (field_length * 8);
+    bits<<= (bytes_in_rec * 8);
   }
 
-  switch (field_length) {
+  switch (bytes_in_rec) {
   case 0: return bits;
   case 1: return bits | (ulonglong) (uchar) ptr[0];
   case 2: return bits | mi_uint2korr(ptr);
@@ -8044,7 +8045,7 @@ longlong Field_bit::val_int(void)
   case 5: return bits | mi_uint5korr(ptr);
   case 6: return bits | mi_uint6korr(ptr);
   case 7: return bits | mi_uint7korr(ptr);
-  default: return mi_uint8korr(ptr + field_length - sizeof(longlong));
+  default: return mi_uint8korr(ptr + bytes_in_rec - sizeof(longlong));
   }
 }  
 
@@ -8097,7 +8098,7 @@ int Field_bit::cmp_offset(uint row_offset)
     if ((flag= (int) (bits_a - bits_b)))
       return flag;
   }
-  return memcmp(ptr, ptr + row_offset, field_length);
+  return memcmp(ptr, ptr + row_offset, bytes_in_rec);
 }
 
 
@@ -8109,7 +8110,7 @@ void Field_bit::get_key_image(char *buff, uint length, imagetype type)
     *buff++= bits;
     length--;
   }
-  memcpy(buff, ptr, min(length, field_length));
+  memcpy(buff, ptr, min(length, bytes_in_rec));
 }
 
 
@@ -8117,22 +8118,22 @@ void Field_bit::sql_type(String &res) const
 {
   CHARSET_INFO *cs= res.charset();
   ulong length= cs->cset->snprintf(cs, (char*) res.ptr(), res.alloced_length(),
-                                   "bit(%d)", 
-                                   (int) field_length * 8 + bit_len);
+                                   "bit(%d)", (int) field_length);
   res.length((uint) length);
 }
 
 
 char *Field_bit::pack(char *to, const char *from, uint max_length)
 {
-  uint length= min(field_length + (bit_len > 0), max_length);
+  DBUG_ASSERT(max_length);
+  uint length;
   if (bit_len)
   {
     uchar bits= get_rec_bits(bit_ptr, bit_ofs, bit_len);
     *to++= bits;
-    length--;
   }
-  memcpy(to, from, length); 
+  length= min(bytes_in_rec, max_length - (bit_len > 0));
+  memcpy(to, from, length);
   return to + length;
 }
 
@@ -8144,8 +8145,8 @@ const char *Field_bit::unpack(char *to, const char *from)
     set_rec_bits(*from, bit_ptr, bit_ofs, bit_len);
     from++;
   }
-  memcpy(to, from, field_length);
-  return from + field_length;
+  memcpy(to, from, bytes_in_rec);
+  return from + bytes_in_rec;
 }
 
 
@@ -8159,26 +8160,25 @@ Field_bit_as_char::Field_bit_as_char(char *ptr_arg, uint32 len_arg,
                                      const char *field_name_arg,
                                      struct st_table *table_arg)
   : Field_bit(ptr_arg, len_arg, null_ptr_arg, null_bit_arg, 0,
-              0, unireg_check_arg, field_name_arg, table_arg),
-    create_length(len_arg)
+              0, unireg_check_arg, field_name_arg, table_arg)
 {
   bit_len= 0;
-  field_length= ((len_arg + 7) & ~7) / 8;
+  bytes_in_rec= (len_arg + 7) / 8;
 }
 
 
 int Field_bit_as_char::store(const char *from, uint length, CHARSET_INFO *cs)
 {
   int delta;
-  uchar bits= create_length & 7;
+  uchar bits= field_length & 7;
 
   for (; length && !*from; from++, length--);          // skip left 0's
-  delta= field_length - length;
+  delta= bytes_in_rec - length;
 
   if (delta < 0 ||
       (delta == 0 && bits && (uint) (uchar) *from >= (uint) (1 << bits)))
   {
-    memset(ptr, 0xff, field_length);
+    memset(ptr, 0xff, bytes_in_rec);
     if (bits)
       *ptr&= ((1 << bits) - 1); /* set first byte */
     if (table->in_use->really_abort_on_warning())
@@ -8197,7 +8197,7 @@ void Field_bit_as_char::sql_type(String &res) const
 {
   CHARSET_INFO *cs= res.charset();
   ulong length= cs->cset->snprintf(cs, (char*) res.ptr(), res.alloced_length(),
-                                   "bit(%d)", (int) create_length);
+                                   "bit(%d)", (int) field_length);
   res.length((uint) length);
 }
 
@@ -8923,11 +8923,6 @@ create_field::create_field(Field *old_field,Field *orig_field)
     geom_type= ((Field_geom*)old_field)->geom_type;
     break;
 #endif
-  case FIELD_TYPE_BIT:
-    length= (old_field->key_type() == HA_KEYTYPE_BIT) ?
-            ((Field_bit *) old_field)->bit_len + length * 8 :
-            ((Field_bit_as_char *) old_field)->create_length;
-    break;
   default:
     break;
   }

sql/field.h

@@ -1303,17 +1303,18 @@ class Field_bit :public Field {
   uchar *bit_ptr;     // position in record where 'uneven' bits store
   uchar bit_ofs;      // offset to 'uneven' high bits
   uint bit_len;       // number of 'uneven' high bits
+  uint bytes_in_rec;
   Field_bit(char *ptr_arg, uint32 len_arg, uchar *null_ptr_arg,
             uchar null_bit_arg, uchar *bit_ptr_arg, uchar bit_ofs_arg,
             enum utype unireg_check_arg, const char *field_name_arg,
             struct st_table *table_arg);
   enum_field_types type() const { return FIELD_TYPE_BIT; }
   enum ha_base_keytype key_type() const { return HA_KEYTYPE_BIT; }
-  uint32 key_length() const { return (uint32) field_length + (bit_len > 0); }
-  uint32 max_length() { return (uint32) field_length * 8 + bit_len; }
+  uint32 key_length() const { return (uint32) (field_length + 7) / 8; }
+  uint32 max_length() { return field_length; }
   uint size_of() const { return sizeof(*this); }
   Item_result result_type () const { return INT_RESULT; }
-  void reset(void) { bzero(ptr, field_length); }
+  void reset(void) { bzero(ptr, bytes_in_rec); }
   int store(const char *to, uint length, CHARSET_INFO *charset);
   int store(double nr);
   int store(longlong nr, bool unsigned_val);
@@ -1335,9 +1336,8 @@ class Field_bit :public Field {
   { Field_bit::store(buff, length, &my_charset_bin); }
   void sort_string(char *buff, uint length)
   { get_key_image(buff, length, itRAW); }
-  uint32 pack_length() const 
-  { return (uint32) field_length + (bit_len > 0); }
-  uint32 pack_length_in_rec() const { return field_length; }
+  uint32 pack_length() const { return (uint32) (field_length + 7) / 8; }
+  uint32 pack_length_in_rec() const { return bytes_in_rec; }
   void sql_type(String &str) const;
   char *pack(char *to, const char *from, uint max_length=~(uint) 0);
   const char *unpack(char* to, const char *from);
@@ -1354,13 +1354,11 @@ class Field_bit :public Field {
 
 class Field_bit_as_char: public Field_bit {
 public:
-  uchar create_length;
   Field_bit_as_char(char *ptr_arg, uint32 len_arg, uchar *null_ptr_arg,
                     uchar null_bit_arg,
                     enum utype unireg_check_arg, const char *field_name_arg,
                     struct st_table *table_arg);
   enum ha_base_keytype key_type() const { return HA_KEYTYPE_BINARY; }
-  uint32 max_length() { return (uint32) create_length; }
   uint size_of() const { return sizeof(*this); }
   int store(const char *to, uint length, CHARSET_INFO *charset);
   int store(double nr) { return Field_bit::store(nr); }

sql/ha_ndbcluster.cc

@@ -3819,7 +3819,7 @@ static int create_ndb_column(NDBCOL &col,
     break;
   case MYSQL_TYPE_BIT:
   {
-    int no_of_bits= field->field_length*8 + ((Field_bit *) field)->bit_len;
+    int no_of_bits= field->field_length;
     col.setType(NDBCOL::Bit);
     if (!no_of_bits)
       col.setLength(1);

sql/key.cc

@@ -192,7 +192,8 @@ void key_restore(byte *to_record, byte *from_key, KEY *key_info,
       Field_bit *field= (Field_bit *) (key_part->field);
       if (field->bit_len)
       {
-        uchar bits= *(from_key + key_part->length - field->field_length -1);
+        uchar bits= *(from_key + key_part->length -
+                      field->pack_length_in_rec() - 1);
         set_rec_bits(bits, to_record + key_part->null_offset +
                      (key_part->null_bit == 128),
                      field->bit_ofs, field->bit_len);