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MDEV-18627 Wrong result after instant size change of integer

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If we instantly change the size of a fixed-length field
and treat it as kind-of variable-length, then we will need
conversions between old column values and new ones.

I tried adding such a conversion to row_build(), but then I
noticed that more conversions would be needed, because
old values still appeared in a freshly rebuilt secondary index,
causing a mismatch when trying to search with the correct
longer value that was converted in my provisional fix to row_build().

So, we will revert the essential part of
MDEV-15563: Instant ROW_FORMAT=REDUNDANT column extension
(commit 22feb179ae), but not
remove any tests.
This commit is contained in:
Marko Mäkelä
2019-02-18 18:30:01 +02:00
parent f0b65102b2
commit 2c74799d64
20 changed files with 186 additions and 246 deletions
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5
sql/sql_priv.h
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@ -358,11 +358,6 @@
data dictionary without changing table rows
*/
#define IS_EQUAL_PACK_LENGTH 2
/**
new_field has a representation that is compatible with the old type
when the storage engine advertises HA_EXTENDED_TYPES_CONVERSION
*/
#define IS_EQUAL_PACK_LENGTH_EXT 3
enum enum_parsing_place
{