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MDEV-14378 - Allow on to drop orphaned #sql- tables

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DROP TABLE now also works on empty or short .frm files
This commit is contained in:
Michael Widenius
2017-11-17 05:18:32 +02:00
parent cf5e193d06
commit 326bfb071c
3 changed files with 35 additions and 20 deletions
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16
sql/sql_table.cc
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@@ -438,6 +438,13 @@ uint check_n_cut_mysql50_prefix(const char *from, char *to, uint to_length)
}
static bool check_if_frm_exists(char *path, const char *db, const char *table)
{
fn_format(path, table, db, reg_ext, MYF(0));
return !access(path, F_OK);
}
/*
Translate a table name to a file name (WL #1324).
@@ -528,13 +535,18 @@ uint build_table_filename(char *buff, size_t bufflen, const char *db,
DBUG_PRINT("enter", ("db: '%s' table_name: '%s' ext: '%s' flags: %x",
db, table_name, ext, flags));
(void) tablename_to_filename(db, dbbuff, sizeof(dbbuff));
/* Check if this is a temporary table name. Allow it if a corresponding .frm file exists */
if (is_prefix(table_name, tmp_file_prefix) && strlen(table_name) < NAME_CHAR_LEN &&
check_if_frm_exists(tbbuff, dbbuff, table_name))
flags|= FN_IS_TMP;
if (flags & FN_IS_TMP) // FN_FROM_IS_TMP | FN_TO_IS_TMP
strmake(tbbuff, table_name, sizeof(tbbuff)-1);
else
(void) tablename_to_filename(table_name, tbbuff, sizeof(tbbuff));
(void) tablename_to_filename(db, dbbuff, sizeof(dbbuff));
char *end = buff + bufflen;
/* Don't add FN_ROOTDIR if mysql_data_home already includes it */
char *pos = strnmov(buff, mysql_data_home, bufflen);