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argument
Implementing dedicated fixing methods:
- Type_handler_bit::Item_func_round_fix_length_and_dec()
- Type_handler_bit::Item_func_int_val_fix_length_and_dec()
- Type_handler_typelib::Item_func_round_fix_length_and_dec()
because the inherited methods did not work well.
Fixing:
- Type_handler_typelib::Item_func_int_val_fix_length_and_dec
It did not work well, because it used args[0]->max_length to
calculate the result data type. In case of ENUM and SET it was
not correct, because in FLOOR() and CEILING() context
ENUM and SET return not more than 5 digits (65535 is the biggest
possible value).
Misc:
- Changing the API of
Type_handler_bit::Bit_decimal_notation_int_digits(const Item *item)
to a more generic form:
Type_handler_bit::Bit_decimal_notation_int_digits_by_nbits(uint nbits)
- Fixing Type_handler_bit::Bit_decimal_notation_int_digits_by_nbits() to
return the exact number of decimal digits for all nbits 1..64.
The old implementation was approximate.
This change gives better (more precise) data types.
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