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MDEV-20732 MDB now correctly estimates a length of the FORMAT() result for

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doubles in scientific notation with a big integer part.
This commit is contained in:
Roman Nozdrin
2019-10-09 03:13:13 -05:00
parent 6535827885
commit ad8266a5c2
9 changed files with 2041 additions and 8 deletions
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45
sql/sql_type.cc
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@ -3490,7 +3490,6 @@ uint32 Type_handler_temporal_result::max_display_length(const Item *item) const
return item->max_length;
}
uint32 Type_handler_string_result::max_display_length(const Item *item) const
{
return item->max_length;
@ -3515,6 +3514,50 @@ uint32 Type_handler_general_purpose_int::max_display_length(const Item *item)
return type_limits_int_by_unsigned_flag(item->unsigned_flag)->char_length();
}
/*************************************************************************/
uint32
Type_handler_decimal_result::Item_decimal_notation_int_digits(const Item *item)
const
{
return item->decimal_int_part();
}
uint32
Type_handler_temporal_result::Item_decimal_notation_int_digits(const Item *item)
const
{
return item->decimal_int_part();
}
uint32
Type_handler_bit::Item_decimal_notation_int_digits(const Item *item)
const
{
return Bit_decimal_notation_int_digits(item);
}
uint32
Type_handler_general_purpose_int::Item_decimal_notation_int_digits(
const Item *item) const
{
return type_limits_int_by_unsigned_flag(item->unsigned_flag)->precision();
}
/*************************************************************************/
/*
Decimal to binary digits ratio converges to log2(10) thus using 3 as
a divisor.
*/
uint32
Type_handler_bit::Bit_decimal_notation_int_digits(const Item *item)
{
return item->max_length/3+1;
}
/*************************************************************************/