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/*-------------------------------------------------------------------------
*
* plannodes.h--
* definitions for query plan nodes
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: plannodes.h,v 1.1.1.1 1996/07/09 06:21:33 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef PLANNODES_H
#define PLANNODES_H
#include "postgres.h"
#include "nodes/nodes.h"
#include "nodes/pg_list.h"
#include "nodes/primnodes.h"
/* ----------------------------------------------------------------
* Executor State types are used in the plannode structures
* so we have to include their definitions too.
*
* Node Type node information used by executor
*
* control nodes
*
* Existential ExistentialState exstate;
* Result ResultState resstate;
* Append AppendState unionstate;
*
* scan nodes
*
* Scan *** CommonScanState scanstate;
* IndexScan IndexScanState indxstate;
*
* (*** nodes which inherit Scan also inherit scanstate)
*
* join nodes
*
* NestLoop NestLoopState nlstate;
* MergeJoin MergeJoinState mergestate;
* HashJoin HashJoinState hashjoinstate;
*
* materialize nodes
*
* Material MaterialState matstate;
* Sort SortState sortstate;
* Unique UniqueState uniquestate;
* Hash HashState hashstate;
*
* ----------------------------------------------------------------
*/
#include "nodes/execnodes.h" /* XXX move executor types elsewhere */
/* ----------------------------------------------------------------
* node definitions
* ----------------------------------------------------------------
*/
/* ----------------
* Plan node
* ----------------
*/
typedef struct Plan {
NodeTag type;
Cost cost;
int plan_size;
int plan_width;
int plan_tupperpage;
EState *state; /* at execution time, state's of individual
nodes point to one EState for the
whole top-level plan */
List *targetlist;
List *qual; /* Node* or List* ?? */
struct Plan *lefttree;
struct Plan *righttree;
} Plan;
/* ----------------
* these are are defined to avoid confusion problems with "left"
* and "right" and "inner" and "outer". The convention is that
* the "left" plan is the "outer" plan and the "right" plan is
* the inner plan, but these make the code more readable.
* ----------------
*/
#define innerPlan(node) (((Plan *)(node))->righttree)
#define outerPlan(node) (((Plan *)(node))->lefttree)
/*
* ===============
* Top-level nodes
* ===============
*/
/* all plan nodes "derive" from the Plan structure by having the
Plan structure as the first field. This ensures that everything works
when nodes are cast to Plan's. (node pointers are frequently cast to Plan*
when passed around generically in the executor */
/* ----------------
* existential node
* ----------------
*/
typedef Plan Existential;
/* ----------------
* result node -
* returns tuples from outer plan that satisfy the qualifications
* ----------------
*/
typedef struct Result {
Plan plan;
Node *resconstantqual;
ResultState *resstate;
} Result;
/* ----------------
* append node
* ----------------
*/
typedef struct Append {
Plan plan;
List *unionplans;
Index unionrelid;
List *unionrtentries;
AppendState *unionstate;
} Append;
/*
* ==========
* Scan nodes
* ==========
*/
typedef struct Scan {
Plan plan;
Index scanrelid; /* relid is index into the range table */
CommonScanState *scanstate;
} Scan;
/* ----------------
* sequential scan node
* ----------------
*/
typedef Scan SeqScan;
/* ----------------
* index scan node
* ----------------
*/
typedef struct IndexScan {
Scan scan;
List *indxid;
List *indxqual;
IndexScanState *indxstate;
} IndexScan;
/*
* ==========
* Join nodes
* ==========
*/
/* ----------------
* Join node
* ----------------
*/
typedef Plan Join;
/* ----------------
* nest loop join node
* ----------------
*/
typedef struct NestLoop {
Join join;
NestLoopState *nlstate;
} NestLoop;
/* ----------------
* merge join node
* ----------------
*/
typedef struct MergeJoin {
Join join;
List *mergeclauses;
Oid mergesortop;
Oid *mergerightorder; /* inner sort operator */
Oid *mergeleftorder; /* outer sort operator */
MergeJoinState *mergestate;
} MergeJoin;
/* ----------------
* hash join (probe) node
* ----------------
*/
typedef struct HashJoin {
Join join;
List *hashclauses;
Oid hashjoinop;
HashJoinState *hashjoinstate;
HashJoinTable hashjointable;
IpcMemoryKey hashjointablekey;
int hashjointablesize;
bool hashdone;
} HashJoin;
/* ---------------
* aggregate node
* ---------------
*/
typedef struct Agg {
Plan plan;
int numAgg;
Aggreg **aggs;
AggState *aggstate;
} Agg;
/* ---------------
* group node -
* use for queries with GROUP BY specified.
*
* If tuplePerGroup is true, one tuple (with group columns only) is
* returned for each group and NULL is returned when there are no more
* groups. Otherwise, all the tuples of a group are returned with a
* NULL returned at the end of each group. (see nodeGroup.c for details)
* ---------------
*/
typedef struct Group {
Plan plan;
bool tuplePerGroup; /* what tuples to return (see above) */
int numCols; /* number of group columns */
AttrNumber *grpColIdx; /* index into the target list */
GroupState *grpstate;
} Group;
/*
* ==========
* Temp nodes
* ==========
*/
typedef struct Temp {
Plan plan;
Oid tempid;
int keycount;
} Temp;
/* ----------------
* materialization node
* ----------------
*/
typedef struct Material {
Plan plan; /* temp node flattened out */
Oid tempid;
int keycount;
MaterialState *matstate;
} Material;
/* ----------------
* sort node
* ----------------
*/
typedef struct Sort {
Plan plan; /* temp node flattened out */
Oid tempid;
int keycount;
SortState *sortstate;
} Sort;
/* ----------------
* unique node
* ----------------
*/
typedef struct Unique {
Plan plan; /* temp node flattened out */
Oid tempid;
int keycount;
char *uniqueAttr; /* NULL if all attrs,
or unique attribute name */
AttrNumber uniqueAttrNum; /* attribute number of attribute
to select distinct on */
UniqueState *uniquestate;
} Unique;
/* ----------------
* hash build node
* ----------------
*/
typedef struct Hash {
Plan plan;
Var *hashkey;
HashState *hashstate;
HashJoinTable hashtable;
IpcMemoryKey hashtablekey;
int hashtablesize;
} Hash;
/* ---------------------
* choose node
* ---------------------
*/
typedef struct Choose {
Plan plan;
List *chooseplanlist;
} Choose;
/* -------------------
* Tee node information
*
* leftParent : the left parent of this node
* rightParent: the right parent of this node
* -------------------
*/
typedef struct Tee {
Plan plan;
Plan* leftParent;
Plan* rightParent;
TeeState *teestate;
char *teeTableName; /* the name of the table to materialize
the tee into */
List *rtentries; /* the range table for the plan below the Tee
may be different than the parent plans */
} Tee;
#endif /* PLANNODES_H */
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