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Merge BUG#12997905 from 5.1 to 5.5

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This commit is contained in:
Jorgen Loland
2011-11-18 14:53:54 +01:00
parent b8ca26691d 4fc5752fb8
commit 90eceaa18e
3 changed files with 21 additions and 1 deletions
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17
sql/field.h
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@ -2227,6 +2227,23 @@ public:
uchar *from_null_ptr,*to_null_ptr;
my_bool *null_row;
uint from_bit,to_bit;
/**
Number of bytes in the fields pointed to by 'from_ptr' and
'to_ptr'. Usually this is the number of bytes that are copied from
'from_ptr' to 'to_ptr'.
For variable-length fields (VARCHAR), the first byte(s) describe
the actual length of the text. For VARCHARs with length
< 256 there is 1 length byte
>= 256 there is 2 length bytes
Thus, if from_field is VARCHAR(10), from_length (and in most cases
to_length) is 11. For VARCHAR(1024), the length is 1026. @see
Field_varstring::length_bytes
Note that for VARCHARs, do_copy() will be do_varstring*() which
only copies the length-bytes (1 or 2) + the actual length of the
text instead of from/to_length bytes. @see get_copy_func()
*/
uint from_length,to_length;
Field *from_field,*to_field;
String tmp; // For items