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Clean up plantree representation of SubPlan-s --- SubLink does not appear

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in the planned representation of a subplan at all any more, only SubPlan.
This means subselect.c doesn't scribble on its input anymore, which seems
like a good thing; and there are no longer three different possible
interpretations of a SubLink.  Simplify node naming and improve comments
in primnodes.h.  No change to stored rules, though.
This commit is contained in:
Tom Lane
2002-12-14 00:17:59 +00:00
parent 29cdab3d53
commit 2d8d66628a
24 changed files with 355 additions and 356 deletions
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17
src/include/nodes/execnodes.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: execnodes.h,v 1.84 2002/12/13 19:45:57 tgl Exp $
* $Id: execnodes.h,v 1.85 2002/12/14 00:17:59 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -451,21 +451,18 @@ typedef struct BoolExprState
} BoolExprState;
/* ----------------
* SubPlanExprState node
*
* Note: there is no separate ExprState node for the SubLink. All it would
* need is the oper field, which we can just as easily put here.
* SubPlanState node
* ----------------
*/
typedef struct SubPlanExprState
typedef struct SubPlanState
{
ExprState xprstate;
struct PlanState *planstate; /* subselect plan's state tree */
bool needShutdown; /* TRUE = need to shutdown subplan */
HeapTuple curTuple; /* copy of most recent tuple from subplan */
List *args; /* states of argument expression(s) */
List *oper; /* states for executable combining exprs */
} SubPlanExprState;
List *args; /* states of argument expression(s) */
} SubPlanState;
/* ----------------
* CaseExprState node
@ -538,9 +535,9 @@ typedef struct PlanState
List *qual; /* implicitly-ANDed qual conditions */
struct PlanState *lefttree; /* input plan tree(s) */
struct PlanState *righttree;
List *initPlan; /* Init SubPlanExprState nodes (un-correlated
List *initPlan; /* Init SubPlanState nodes (un-correlated
* expr subselects) */
List *subPlan; /* SubPlanExprState nodes in my expressions */
List *subPlan; /* SubPlanState nodes in my expressions */
/*
* State for management of parameter-change-driven rescanning