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DRAFT | MDEV-35026 - DROP CONSTRAINT for self referencing FK fails without error, but modifies another UNIQUE KEY definied with USING HASH #5380

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DRAFT | MDEV-35026 - DROP CONSTRAINT for self referencing FK fails without error, but modifies another UNIQUE KEY definied with USING HASH #5380

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pranavktiwari Jul 13, 2026
d495131
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pranavktiwari Jul 14, 2026
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7 changes: 3 additions & 4 deletions sql/sql_table.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -3067,11 +3067,10 @@ my_bool init_key_info(THD *thd, Alter_info *alter_info,

if (is_hash_field_needed)
{
if (key_cinfo->algorithm == HA_KEY_ALG_UNDEF)
if (key_cinfo->algorithm == HA_KEY_ALG_UNDEF || key_cinfo->algorithm == HA_KEY_ALG_HASH)
key_cinfo->algorithm= HA_KEY_ALG_LONG_HASH;

if (key_cinfo->algorithm != HA_KEY_ALG_HASH &&
key_cinfo->algorithm != HA_KEY_ALG_LONG_HASH)
if (key_cinfo->algorithm != HA_KEY_ALG_LONG_HASH)
{
my_error(ER_TOO_LONG_KEY, MYF(0), max_key_length);
DBUG_RETURN(TRUE);
Expand Down Expand Up @@ -9163,7 +9162,7 @@ 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_ctx->fast_alter_partition ?
key_info->algorithm= (alter_ctx->fast_alter_partition || !(alter_info->flags & ALTER_CHANGE_COLUMN)) ?
HA_KEY_ALG_HASH : HA_KEY_ALG_UNDEF;
/*
For fast alter partition we set HA_KEY_ALG_HASH above to make sure it
Expand Down