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ALTER TABLE ... ALTER COLUMN ... DROP EXPRESSION

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Add an ALTER TABLE subcommand for dropping the generated property from
a column, per SQL standard.

Reviewed-by: Sergei Kornilov <sk@zsrv.org>
Discussion: https://www.postgresql.org/message-id/flat/2f7f1d9c-946e-0453-d841-4f38eb9d69b6%402ndquadrant.com
This commit is contained in:
Peter Eisentraut
2020-01-14 13:09:31 +01:00
parent d751ba5235
commit f595117e24
9 changed files with 326 additions and 4 deletions
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20
src/backend/parser/gram.y
View File

@ -639,7 +639,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
DOUBLE_P DROP
EACH ELSE ENABLE_P ENCODING ENCRYPTED END_P ENUM_P ESCAPE EVENT EXCEPT
EXCLUDE EXCLUDING EXCLUSIVE EXECUTE EXISTS EXPLAIN
EXCLUDE EXCLUDING EXCLUSIVE EXECUTE EXISTS EXPLAIN EXPRESSION
EXTENSION EXTERNAL EXTRACT
FALSE_P FAMILY FETCH FILTER FIRST_P FLOAT_P FOLLOWING FOR
@ -2129,6 +2129,23 @@ alter_table_cmd:
n->name = $3;
$$ = (Node *)n;
}
/* ALTER TABLE <name> ALTER [COLUMN] <colname> DROP EXPRESSION */
| ALTER opt_column ColId DROP EXPRESSION
{
AlterTableCmd *n = makeNode(AlterTableCmd);
n->subtype = AT_DropExpression;
n->name = $3;
$$ = (Node *)n;
}
/* ALTER TABLE <name> ALTER [COLUMN] <colname> DROP EXPRESSION IF EXISTS */
| ALTER opt_column ColId DROP EXPRESSION IF_P EXISTS
{
AlterTableCmd *n = makeNode(AlterTableCmd);
n->subtype = AT_DropExpression;
n->name = $3;
n->missing_ok = true;
$$ = (Node *)n;
}
/* ALTER TABLE <name> ALTER [COLUMN] <colname> SET STATISTICS <SignedIconst> */
| ALTER opt_column ColId SET STATISTICS SignedIconst
{
@ -15196,6 +15213,7 @@ unreserved_keyword:
| EXCLUSIVE
| EXECUTE
| EXPLAIN
| EXPRESSION
| EXTENSION
| EXTERNAL
| FAMILY