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MDEV-452 Add full support for auto-initialized/updated timestamp and datetime

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Generalized support for auto-updated and/or auto-initialized timestamp
and datetime columns. This patch is a reimplementation of MySQL's
"WL#5874: CURRENT_TIMESTAMP as DEFAULT for DATETIME columns". In order to
ease future merges, this implementation reused few function and variable
names from MySQL's patch, however the implementation is quite different.

TODO:
The only unresolved problem in this patch is the semantics of LOAD DATA for
TIMESTAMP and DATETIME columns in the cases when there are missing or NULL
columns. I couldn't fully comprehend the logic behind MySQL's behavior and
its relationship with their own documentation, so I left the results to be
more consistent with all other LOAD cases.

The problematic test cases can be seen by running the test file function_defaults,
and observing the test case differences. Those were left on purpose for discussion.
This commit is contained in:
unknown
2012-10-17 15:43:56 +03:00
parent 620d14f8c3
commit bc4a456758
61 changed files with 5375 additions and 540 deletions
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4
sql/sql_table.h
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@@ -187,7 +187,6 @@ void close_cached_table(THD *thd, TABLE *table);
void sp_prepare_create_field(THD *thd, Create_field *sql_field);
int prepare_create_field(Create_field *sql_field,
uint *blob_columns,
int *timestamps, int *timestamps_with_niladic,
longlong table_flags);
CHARSET_INFO* get_sql_field_charset(Create_field *sql_field,
HA_CREATE_INFO *create_info);
@@ -208,6 +207,9 @@ void execute_ddl_log_recovery();
bool execute_ddl_log_entry(THD *thd, uint first_entry);
bool check_duplicate_warning(THD *thd, char *msg, ulong length);
template<typename T> class List;
void promote_first_timestamp_column(List<Create_field> *column_definitions);
/*
These prototypes where under INNODB_COMPATIBILITY_HOOKS.
*/