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MDEV-25654 only force HA_KEY_ALG_HASH for fast alter partition

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not for any ALTER TABLE without ALTER_CHANGE_COLUMN.

This fixes galera_sr.MDEV-28971 test

followup for 0dcd30197a
This commit is contained in:
Sergei Golubchik
2025-01-18 15:11:12 +01:00
parent b1f57a98a8
commit 782c4b94f0
4 changed files with 21 additions and 16 deletions
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25
sql/sql_table.cc
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@@ -9276,19 +9276,13 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
LEX_CSTRING tmp_name;
bzero((char*) &key_create_info, sizeof(key_create_info));
if (key_info->algorithm == HA_KEY_ALG_LONG_HASH)
key_info->algorithm= (alter_info->flags & ALTER_CHANGE_COLUMN) ?
HA_KEY_ALG_UNDEF : HA_KEY_ALG_HASH;
key_info->algorithm= alter_ctx->fast_alter_partition ?
HA_KEY_ALG_HASH : HA_KEY_ALG_UNDEF;
/*
This one goes to mysql_prepare_create_table():
key_info->algorithm= key->key_create_info.algorithm;
For HA_KEY_ALG_LONG_HASH if we didn't change ANY column, we pass
HA_KEY_ALG_HASH to ensure mysql_prepare_create_table() does add_hash_field().
This protects fast alter partition from losing hash properties.
In case of any column changes we drop algorithm to HA_KEY_ALG_UNDEF and
let decide mysql_prepare_create_table() if the hash field is needed
depending on new types.
For fast alter partition we set HA_KEY_ALG_HASH above to make sure it
doesn't lose the hash property.
Otherwise we let mysql_prepare_create_table() decide if the hash field
is needed depending on the (possibly changed) data types.
*/
key_create_info.algorithm= key_info->algorithm;
/*
@@ -10317,7 +10311,6 @@ bool mysql_alter_table(THD *thd, const LEX_CSTRING *new_db,
TABLE *table, *new_table= nullptr;
#ifdef WITH_PARTITION_STORAGE_ENGINE
bool partition_changed= false;
bool fast_alter_partition= false;
#endif
/*
Create .FRM for new version of table with a temporary name.
@@ -10844,7 +10837,7 @@ do_continue:;
Partitioning: part_info is prepared and returned via thd->work_part_info
*/
if (prep_alter_part_table(thd, table, alter_info, create_info,
&partition_changed, &fast_alter_partition))
&partition_changed, &alter_ctx.fast_alter_partition))
{
DBUG_RETURN(true);
}
@@ -10879,7 +10872,7 @@ do_continue:;
Note, one can run a separate "ALTER TABLE t1 FORCE;" statement
before or after the partition change ALTER statement to upgrade data types.
*/
if (IF_PARTITIONING(!fast_alter_partition, 1))
if (!alter_ctx.fast_alter_partition)
Create_field::upgrade_data_types(alter_info->create_list);
if (create_info->check_fields(thd, alter_info,
@@ -10891,7 +10884,7 @@ do_continue:;
promote_first_timestamp_column(&alter_info->create_list);
#ifdef WITH_PARTITION_STORAGE_ENGINE
if (fast_alter_partition)
if (alter_ctx.fast_alter_partition)
{
/*
ALGORITHM and LOCK clauses are generally not allowed by the