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Support ALTER SYSTEM RESET command.

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This patch allows us to execute ALTER SYSTEM RESET command to
remove the configuration entry from postgresql.auto.conf.

Vik Fearing, reviewed by Amit Kapila and me.
This commit is contained in:
Fujii Masao
2014-09-02 16:06:58 +09:00
parent 01b6976c13
commit bd3b7a9eef
4 changed files with 117 additions and 64 deletions
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49
src/backend/parser/gram.y
View File

@ -411,7 +411,8 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
%type <istmt> insert_rest
%type <vsetstmt> generic_set set_rest set_rest_more SetResetClause FunctionSetResetClause
%type <vsetstmt> generic_set set_rest set_rest_more generic_reset reset_rest
SetResetClause FunctionSetResetClause
%type <node> TableElement TypedTableElement ConstraintElem TableFuncElement
%type <node> columnDef columnOptions
@ -1579,39 +1580,47 @@ NonReservedWord_or_Sconst:
;
VariableResetStmt:
RESET var_name
{
VariableSetStmt *n = makeNode(VariableSetStmt);
n->kind = VAR_RESET;
n->name = $2;
$$ = (Node *) n;
}
| RESET TIME ZONE
RESET reset_rest { $$ = (Node *) $2; }
;
reset_rest:
generic_reset { $$ = $1; }
| TIME ZONE
{
VariableSetStmt *n = makeNode(VariableSetStmt);
n->kind = VAR_RESET;
n->name = "timezone";
$$ = (Node *) n;
$$ = n;
}
| RESET TRANSACTION ISOLATION LEVEL
| TRANSACTION ISOLATION LEVEL
{
VariableSetStmt *n = makeNode(VariableSetStmt);
n->kind = VAR_RESET;
n->name = "transaction_isolation";
$$ = (Node *) n;
$$ = n;
}
| RESET SESSION AUTHORIZATION
| SESSION AUTHORIZATION
{
VariableSetStmt *n = makeNode(VariableSetStmt);
n->kind = VAR_RESET;
n->name = "session_authorization";
$$ = (Node *) n;
$$ = n;
}
| RESET ALL
;
generic_reset:
var_name
{
VariableSetStmt *n = makeNode(VariableSetStmt);
n->kind = VAR_RESET;
n->name = $1;
$$ = n;
}
| ALL
{
VariableSetStmt *n = makeNode(VariableSetStmt);
n->kind = VAR_RESET_ALL;
$$ = (Node *) n;
$$ = n;
}
;
@ -8494,7 +8503,7 @@ DropdbStmt: DROP DATABASE database_name
/*****************************************************************************
*
* ALTER SYSTEM SET
* ALTER SYSTEM
*
* This is used to change configuration parameters persistently.
*****************************************************************************/
@ -8506,6 +8515,12 @@ AlterSystemStmt:
n->setstmt = $4;
$$ = (Node *)n;
}
| ALTER SYSTEM_P RESET generic_reset
{
AlterSystemStmt *n = makeNode(AlterSystemStmt);
n->setstmt = $4;
$$ = (Node *)n;
}
;