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| author | Sergei Golubchik <serg@mariadb.org> | 2016-07-23 16:55:52 +0200 |
|---|---|---|
| committer | Sergei Golubchik <serg@mariadb.org> | 2016-08-27 16:59:12 +0200 |
| commit | 12d2c4fcd0bc3fbe74759e8285f2c93ad348e749 (patch) | |
| tree | e8f0ec7fab2a8ec1365e10a5ddde62e7af2e885d /sql/field.h | |
| parent | 4070d55735f1642e563b8d60fc2e9771f4963a3f (diff) | |
| download | mariadb-git-12d2c4fcd0bc3fbe74759e8285f2c93ad348e749.tar.gz | |
optimize constant default expressions
to be calculated at the CREATE TABLE time and stored in
the default row image.
Diffstat (limited to 'sql/field.h')
| -rw-r--r-- | sql/field.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sql/field.h b/sql/field.h index f3328d560b8..45d2c3a7f00 100644 --- a/sql/field.h +++ b/sql/field.h @@ -574,7 +574,11 @@ inline bool is_temporal_type_with_time(enum_field_types type) } } -/* Bits for type of vcol expression */ +/* + Flags for Virtual_column_info. If none is set, the expression must be + a constant with no side-effects, so it's calculated at CREATE TABLE time, + stored in table->record[2], and not recalculated for every statement. +*/ #define VCOL_FIELD_REF 1 #define VCOL_NON_DETERMINISTIC 2 #define VCOL_SESSION_FUNC 4 /* uses session data, e.g. USER or DAYNAME */ |