diff options
| author | Peter Eisentraut | 2024-01-04 14:45:35 +0000 |
|---|---|---|
| committer | Peter Eisentraut | 2024-01-04 15:28:54 +0000 |
| commit | 5d06e99a3cfc23bbc217b4d78b8c070ad52f720e (patch) | |
| tree | f19ee2c99bdfec654b28f4e6afdbae26c5ff0eb0 /src/include | |
| parent | ae69c4fcf1337af399a788ab8d96af540bd1cd8e (diff) | |
ALTER TABLE command to change generation expression
This adds a new ALTER TABLE subcommand ALTER COLUMN ... SET EXPRESSION
that changes the generation expression of a generated column.
The syntax is not standard but was adapted from other SQL
implementations.
This command causes a table rewrite, using the usual ALTER TABLE
mechanisms. The implementation is similar to and makes use of some of
the infrastructure of the SET DATA TYPE subcommand (for example,
rebuilding constraints and indexes afterwards). The new command
requires a new pass in AlterTablePass, and the ADD COLUMN pass had to
be moved earlier so that combinations of ADD COLUMN and SET EXPRESSION
can work.
Author: Amul Sul <sulamul@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CAAJ_b94yyJeGA-5M951_Lr+KfZokOp-2kXicpmEhi5FXhBeTog@mail.gmail.com
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/nodes/parsenodes.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h index 1ee92aa7f0c..b3181f34aee 100644 --- a/src/include/nodes/parsenodes.h +++ b/src/include/nodes/parsenodes.h @@ -2192,6 +2192,7 @@ typedef enum AlterTableType AT_DropNotNull, /* alter column drop not null */ AT_SetNotNull, /* alter column set not null */ AT_SetAttNotNull, /* set attnotnull w/o a constraint */ + AT_SetExpression, /* alter column set expression */ AT_DropExpression, /* alter column drop expression */ AT_SetStatistics, /* alter column set statistics */ AT_SetOptions, /* alter column set ( options ) */ |