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Assisted discovery

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This commit is contained in:
Sergei Golubchik
2013-04-09 16:19:14 +02:00
parent 60aed41222
commit 32ee15d851
3 changed files with 81 additions and 14 deletions
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20
sql/handler.h
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@ -634,6 +634,7 @@ enum enum_schema_tables
};
struct TABLE_SHARE;
struct HA_CREATE_INFO;
struct st_foreign_key_info;
typedef struct st_foreign_key_info FOREIGN_KEY_INFO;
typedef bool (stat_print_fn)(THD *thd, const char *type, uint type_len,
@ -1169,6 +1170,25 @@ struct handlerton
int (*discover_table_existence)(handlerton *hton, const char *db,
const char *table_name);
/*
This is the assisted table discovery method. Unlike the fully
automatic discovery as above, here a user is expected to issue an
explicit CREATE TABLE with the appropriate table attributes to
"assist" the discovery of a table. But this "discovering" CREATE TABLE
statement will not specify the table structure - the engine discovers
it using this method. For example, FederatedX uses it in
CREATE TABLE t1 ENGINE=FEDERATED CONNECTION="mysql://foo/bar/t1";
Given a TABLE_SHARE discover_table_structure() fills it in with a correct
table structure using one of the TABLE_SHARE::init_from_* methods.
Assisted discovery works independently from the automatic discover.
An engine is allowed to support only assisted discovery and not
support automatic one. Or vice versa.
*/
int (*discover_table_structure)(handlerton *hton, THD* thd,
TABLE_SHARE *share, HA_CREATE_INFO *info);
};