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Create the system catalog infrastructure needed for KNNGIST.

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This commit adds columns amoppurpose and amopsortfamily to pg_amop, and
column amcanorderbyop to pg_am.  For the moment all the entries in
amcanorderbyop are "false", since the underlying support isn't there yet.

Also, extend the CREATE OPERATOR CLASS/ALTER OPERATOR FAMILY commands with
[ FOR SEARCH | FOR ORDER BY sort_operator_family ] clauses to allow the new
columns of pg_amop to be populated, and create pg_dump support for dumping
that information.

I also added some documentation, although it's perhaps a bit premature
given that the feature doesn't do anything useful yet.

Teodor Sigaev, Robert Haas, Tom Lane
This commit is contained in:
Tom Lane
2010-11-24 14:20:39 -05:00
parent 4fc09ad00c
commit 725d52d0c2
21 changed files with 913 additions and 475 deletions
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14
src/backend/parser/gram.y
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@@ -295,7 +295,7 @@ static RangeVar *makeRangeVarFromAnyName(List *names, int position, core_yyscan_
ctext_expr_list ctext_row def_list indirection opt_indirection
reloption_list group_clause TriggerFuncArgs select_limit
opt_select_limit opclass_item_list opclass_drop_list
opt_opfamily transaction_mode_list_or_empty
opclass_purpose opt_opfamily transaction_mode_list_or_empty
OptTableFuncElementList TableFuncElementList opt_type_modifiers
prep_type_clause
execute_param_clause using_clause returning_clause
@@ -3935,22 +3935,25 @@ opclass_item_list:
;
opclass_item:
OPERATOR Iconst any_operator opt_recheck
OPERATOR Iconst any_operator opclass_purpose opt_recheck
{
CreateOpClassItem *n = makeNode(CreateOpClassItem);
n->itemtype = OPCLASS_ITEM_OPERATOR;
n->name = $3;
n->args = NIL;
n->number = $2;
n->order_family = $4;
$$ = (Node *) n;
}
| OPERATOR Iconst any_operator oper_argtypes opt_recheck
| OPERATOR Iconst any_operator oper_argtypes opclass_purpose
opt_recheck
{
CreateOpClassItem *n = makeNode(CreateOpClassItem);
n->itemtype = OPCLASS_ITEM_OPERATOR;
n->name = $3;
n->args = $4;
n->number = $2;
n->order_family = $5;
$$ = (Node *) n;
}
| FUNCTION Iconst func_name func_args
@@ -3989,6 +3992,11 @@ opt_opfamily: FAMILY any_name { $$ = $2; }
| /*EMPTY*/ { $$ = NIL; }
;
opclass_purpose: FOR SEARCH { $$ = NIL; }
| FOR ORDER BY any_name { $$ = $4; }
| /*EMPTY*/ { $$ = NIL; }
;
opt_recheck: RECHECK
{
/*