The problem was manifestated only with BIT columns and only when more than
one row was fetched. The problem was coming from the fact that in pre-7.0
times mysqlnd was using a no-copy optimization. This optimization kept the
strings (and also the BIT mask equivalents as strings) in the packet and the
zval referred to them. 7.0+ zvals cannot use no-copy and always copy. Because
of this the allocated memory for the packet was reduced by 1 by the person who
ported the driver, but the starting address of the bit area wasn't reduced.
Because of this the bit_area started at wrong address and the length decoded
wrong.
and #68657 (Reading 4 byte floats with Mysqli and libmysqlclient
has rounding errors).
The patch removes support for Decimal floating point numbers and
now defaults to using similar logic as what libmysqlclient does:
convert a 4 byte floating point number into a string, and then the
string into a double. The quirks of MySQL are maintained as seen in
Field_Float::val_str()
* PHP-5.6:
Add NEWS
Add NEWS
Patch commit d9f85373e3 by moving the float_to_double function to a header file.
Fix for bugs #68114 (Build fails on OS X due to undefined symbols) and #68657 (Reading 4 byte floats with Mysqli and libmysqlclient has rounding errors).
5.5.22 now
Conflicts:
ext/mysqli/mysqli_api.c
* PHP-5.5:
Add NEWS
Patch commit d9f85373e3 by moving the float_to_double function to a header file.
Fix for bugs #68114 (Build fails on OS X due to undefined symbols) and #68657 (Reading 4 byte floats with Mysqli and libmysqlclient has rounding errors).
5.5.22 now
Conflicts:
configure.in
main/php_version.h
and #68657 (Reading 4 byte floats with Mysqli and libmysqlclient
has rounding errors).
The patch removes support for Decimal floating point numbers and
now defaults to using similar logic as what libmysqlclient does:
convert a 4 byte floating point number into a string, and then the
string into a double. The quirks of MySQL are maintained as seen in
Field_Float::val_str()
Before the patch, a value of 9.99 in a FLOAT column came out of mysqli
as 9.9998998641968. This is because it would naively cast a 4-byte float
into PHP's internal 8-byte double.
To fix this, with GCC we use the built-in decimal support to "up-convert"
the 4-byte float to a 8-byte double.
When that is not available, we fall back to converting the float
to a string and then converting the string to a double. This mimics
what MySQL does.
