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Add ALTER OPERATOR command, for changing selectivity estimator functions.

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Other options cannot be changed, as it's not totally clear if cached plans
would need to be invalidated if one of the other options change. Selectivity
estimator functions only change plan costs, not correctness of plans, so
those should be safe.

Original patch by Uriy Zhuravlev, heavily edited by me.
This commit is contained in:
Heikki Linnakangas
2015-07-14 18:17:55 +03:00
parent 705d397cd9
commit 321eed5f0f
13 changed files with 499 additions and 65 deletions
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34
src/backend/parser/gram.y
View File

@ -232,7 +232,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
AlterEventTrigStmt
AlterDatabaseStmt AlterDatabaseSetStmt AlterDomainStmt AlterEnumStmt
AlterFdwStmt AlterForeignServerStmt AlterGroupStmt
AlterObjectSchemaStmt AlterOwnerStmt AlterSeqStmt AlterSystemStmt AlterTableStmt
AlterObjectSchemaStmt AlterOwnerStmt AlterOperatorStmt AlterSeqStmt AlterSystemStmt AlterTableStmt
AlterTblSpcStmt AlterExtensionStmt AlterExtensionContentsStmt AlterForeignTableStmt
AlterCompositeTypeStmt AlterUserStmt AlterUserMappingStmt AlterUserSetStmt
AlterRoleStmt AlterRoleSetStmt AlterPolicyStmt
@ -359,7 +359,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
any_operator expr_list attrs
target_list opt_target_list insert_column_list set_target_list
set_clause_list set_clause multiple_set_clause
ctext_expr_list ctext_row def_list indirection opt_indirection
ctext_expr_list ctext_row def_list operator_def_list indirection opt_indirection
reloption_list group_clause TriggerFuncArgs select_limit
opt_select_limit opclass_item_list opclass_drop_list
opclass_purpose opt_opfamily transaction_mode_list_or_empty
@ -432,7 +432,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
%type <node> TableElement TypedTableElement ConstraintElem TableFuncElement
%type <node> columnDef columnOptions
%type <defelt> def_elem reloption_elem old_aggr_elem
%type <defelt> def_elem reloption_elem old_aggr_elem operator_def_elem
%type <node> def_arg columnElem where_clause where_or_current_clause
a_expr b_expr c_expr AexprConst indirection_el
columnref in_expr having_clause func_table array_expr
@ -769,6 +769,7 @@ stmt :
| AlterGroupStmt
| AlterObjectSchemaStmt
| AlterOwnerStmt
| AlterOperatorStmt
| AlterPolicyStmt
| AlterSeqStmt
| AlterSystemStmt
@ -8196,6 +8197,33 @@ AlterObjectSchemaStmt:
}
;
/*****************************************************************************
*
* ALTER OPERATOR name SET define
*
*****************************************************************************/
AlterOperatorStmt:
ALTER OPERATOR any_operator oper_argtypes SET '(' operator_def_list ')'
{
AlterOperatorStmt *n = makeNode(AlterOperatorStmt);
n->opername = $3;
n->operargs = $4;
n->options = $7;
$$ = (Node *)n;
}
;
operator_def_list: operator_def_elem { $$ = list_make1($1); }
| operator_def_list ',' operator_def_elem { $$ = lappend($1, $3); }
;
operator_def_elem: ColLabel '=' NONE
{ $$ = makeDefElem($1, NULL); }
| ColLabel '=' def_arg
{ $$ = makeDefElem($1, (Node *) $3); }
;
/*****************************************************************************
*
* ALTER THING name OWNER TO newname