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f41803bb39
representation of equivalence classes of variables. This is an extensive rewrite, but it brings a number of benefits: * planner no longer fails in the presence of "incomplete" operator families that don't offer operators for every possible combination of datatypes. * avoid generating and then discarding redundant equality clauses. * remove bogus assumption that derived equalities always use operators named "=". * mergejoins can work with a variety of sort orders (e.g., descending) now, instead of tying each mergejoinable operator to exactly one sort order. * better recognition of redundant sort columns. * can make use of equalities appearing underneath an outer join.
487 lines
10 KiB
C
487 lines
10 KiB
C
/*-------------------------------------------------------------------------
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*
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* nodes.h
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* Definitions for tagged nodes.
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*
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*
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* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/nodes/nodes.h,v 1.192 2007/01/20 20:45:40 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef NODES_H
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#define NODES_H
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/*
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* The first field of every node is NodeTag. Each node created (with makeNode)
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* will have one of the following tags as the value of its first field.
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*
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* Note that the numbers of the node tags are not contiguous. We left holes
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* here so that we can add more tags without changing the existing enum's.
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* (Since node tag numbers never exist outside backend memory, there's no
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* real harm in renumbering, it just costs a full rebuild ...)
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*/
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typedef enum NodeTag
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{
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T_Invalid = 0,
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/*
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* TAGS FOR EXECUTOR NODES (execnodes.h)
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*/
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T_IndexInfo = 10,
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T_ExprContext,
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T_ProjectionInfo,
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T_JunkFilter,
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T_ResultRelInfo,
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T_EState,
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T_TupleTableSlot,
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/*
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* TAGS FOR PLAN NODES (plannodes.h)
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*/
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T_Plan = 100,
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T_Result,
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T_Append,
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T_BitmapAnd,
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T_BitmapOr,
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T_Scan,
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T_SeqScan,
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T_IndexScan,
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T_BitmapIndexScan,
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T_BitmapHeapScan,
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T_TidScan,
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T_SubqueryScan,
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T_FunctionScan,
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T_ValuesScan,
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T_Join,
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T_NestLoop,
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T_MergeJoin,
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T_HashJoin,
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T_Material,
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T_Sort,
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T_Group,
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T_Agg,
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T_Unique,
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T_Hash,
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T_SetOp,
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T_Limit,
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/*
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* TAGS FOR PLAN STATE NODES (execnodes.h)
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*
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* These should correspond one-to-one with Plan node types.
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*/
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T_PlanState = 200,
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T_ResultState,
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T_AppendState,
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T_BitmapAndState,
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T_BitmapOrState,
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T_ScanState,
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T_SeqScanState,
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T_IndexScanState,
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T_BitmapIndexScanState,
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T_BitmapHeapScanState,
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T_TidScanState,
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T_SubqueryScanState,
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T_FunctionScanState,
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T_ValuesScanState,
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T_JoinState,
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T_NestLoopState,
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T_MergeJoinState,
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T_HashJoinState,
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T_MaterialState,
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T_SortState,
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T_GroupState,
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T_AggState,
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T_UniqueState,
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T_HashState,
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T_SetOpState,
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T_LimitState,
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/*
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* TAGS FOR PRIMITIVE NODES (primnodes.h)
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*/
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T_Alias = 300,
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T_RangeVar,
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T_Expr,
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T_Var,
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T_Const,
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T_Param,
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T_Aggref,
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T_ArrayRef,
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T_FuncExpr,
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T_OpExpr,
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T_DistinctExpr,
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T_ScalarArrayOpExpr,
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T_BoolExpr,
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T_SubLink,
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T_SubPlan,
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T_FieldSelect,
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T_FieldStore,
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T_RelabelType,
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T_ConvertRowtypeExpr,
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T_CaseExpr,
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T_CaseWhen,
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T_CaseTestExpr,
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T_ArrayExpr,
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T_RowExpr,
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T_RowCompareExpr,
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T_CoalesceExpr,
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T_MinMaxExpr,
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T_XmlExpr,
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T_NullIfExpr,
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T_NullTest,
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T_BooleanTest,
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T_CoerceToDomain,
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T_CoerceToDomainValue,
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T_SetToDefault,
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T_TargetEntry,
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T_RangeTblRef,
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T_JoinExpr,
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T_FromExpr,
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/*
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* TAGS FOR EXPRESSION STATE NODES (execnodes.h)
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*
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* These correspond (not always one-for-one) to primitive nodes derived
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* from Expr.
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*/
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T_ExprState = 400,
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T_GenericExprState,
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T_AggrefExprState,
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T_ArrayRefExprState,
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T_FuncExprState,
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T_ScalarArrayOpExprState,
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T_BoolExprState,
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T_SubPlanState,
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T_FieldSelectState,
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T_FieldStoreState,
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T_ConvertRowtypeExprState,
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T_CaseExprState,
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T_CaseWhenState,
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T_ArrayExprState,
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T_RowExprState,
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T_RowCompareExprState,
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T_CoalesceExprState,
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T_MinMaxExprState,
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T_XmlExprState,
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T_NullTestState,
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T_CoerceToDomainState,
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T_DomainConstraintState,
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/*
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* TAGS FOR PLANNER NODES (relation.h)
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*/
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T_PlannerInfo = 500,
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T_RelOptInfo,
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T_IndexOptInfo,
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T_Path,
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T_IndexPath,
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T_BitmapHeapPath,
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T_BitmapAndPath,
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T_BitmapOrPath,
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T_NestPath,
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T_MergePath,
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T_HashPath,
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T_TidPath,
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T_AppendPath,
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T_ResultPath,
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T_MaterialPath,
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T_UniquePath,
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T_EquivalenceClass,
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T_EquivalenceMember,
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T_PathKey,
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T_RestrictInfo,
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T_InnerIndexscanInfo,
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T_OuterJoinInfo,
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T_InClauseInfo,
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T_AppendRelInfo,
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/*
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* TAGS FOR MEMORY NODES (memnodes.h)
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*/
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T_MemoryContext = 600,
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T_AllocSetContext,
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/*
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* TAGS FOR VALUE NODES (value.h)
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*/
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T_Value = 650,
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T_Integer,
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T_Float,
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T_String,
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T_BitString,
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T_Null,
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/*
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* TAGS FOR LIST NODES (pg_list.h)
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*/
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T_List,
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T_IntList,
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T_OidList,
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/*
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* TAGS FOR PARSE TREE NODES (parsenodes.h)
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*/
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T_Query = 700,
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T_InsertStmt,
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T_DeleteStmt,
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T_UpdateStmt,
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T_SelectStmt,
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T_AlterTableStmt,
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T_AlterTableCmd,
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T_AlterDomainStmt,
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T_SetOperationStmt,
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T_GrantStmt,
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T_GrantRoleStmt,
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T_ClosePortalStmt,
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T_ClusterStmt,
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T_CopyStmt,
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T_CreateStmt,
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T_DefineStmt,
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T_DropStmt,
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T_TruncateStmt,
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T_CommentStmt,
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T_FetchStmt,
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T_IndexStmt,
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T_CreateFunctionStmt,
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T_AlterFunctionStmt,
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T_RemoveFuncStmt,
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T_RenameStmt,
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T_RuleStmt,
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T_NotifyStmt,
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T_ListenStmt,
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T_UnlistenStmt,
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T_TransactionStmt,
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T_ViewStmt,
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T_LoadStmt,
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T_CreateDomainStmt,
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T_CreatedbStmt,
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T_DropdbStmt,
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T_VacuumStmt,
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T_ExplainStmt,
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T_CreateSeqStmt,
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T_AlterSeqStmt,
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T_VariableSetStmt,
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T_VariableShowStmt,
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T_VariableResetStmt,
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T_CreateTrigStmt,
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T_DropPropertyStmt,
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T_CreatePLangStmt,
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T_DropPLangStmt,
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T_CreateRoleStmt,
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T_AlterRoleStmt,
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T_DropRoleStmt,
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T_LockStmt,
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T_ConstraintsSetStmt,
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T_ReindexStmt,
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T_CheckPointStmt,
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T_CreateSchemaStmt,
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T_AlterDatabaseStmt,
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T_AlterDatabaseSetStmt,
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T_AlterRoleSetStmt,
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T_CreateConversionStmt,
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T_CreateCastStmt,
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T_DropCastStmt,
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T_CreateOpClassStmt,
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T_RemoveOpClassStmt,
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T_PrepareStmt,
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T_ExecuteStmt,
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T_DeallocateStmt,
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T_DeclareCursorStmt,
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T_CreateTableSpaceStmt,
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T_DropTableSpaceStmt,
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T_AlterObjectSchemaStmt,
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T_AlterOwnerStmt,
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T_DropOwnedStmt,
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T_ReassignOwnedStmt,
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T_A_Expr = 800,
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T_ColumnRef,
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T_ParamRef,
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T_A_Const,
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T_FuncCall,
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T_A_Indices,
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T_A_Indirection,
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T_ResTarget,
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T_TypeCast,
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T_SortBy,
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T_RangeSubselect,
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T_RangeFunction,
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T_TypeName,
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T_ColumnDef,
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T_IndexElem,
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T_Constraint,
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T_DefElem,
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T_RangeTblEntry,
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T_SortClause,
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T_GroupClause,
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T_FkConstraint,
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T_PrivGrantee,
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T_FuncWithArgs,
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T_PrivTarget,
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T_CreateOpClassItem,
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T_CompositeTypeStmt,
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T_InhRelation,
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T_FunctionParameter,
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T_LockingClause,
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T_RowMarkClause,
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/*
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* TAGS FOR RANDOM OTHER STUFF
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*
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* These are objects that aren't part of parse/plan/execute node tree
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* structures, but we give them NodeTags anyway for identification
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* purposes (usually because they are involved in APIs where we want to
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* pass multiple object types through the same pointer).
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*/
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T_TriggerData = 900, /* in commands/trigger.h */
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T_ReturnSetInfo, /* in nodes/execnodes.h */
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T_TIDBitmap /* in nodes/tidbitmap.h */
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} NodeTag;
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/*
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* The first field of a node of any type is guaranteed to be the NodeTag.
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* Hence the type of any node can be gotten by casting it to Node. Declaring
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* a variable to be of Node * (instead of void *) can also facilitate
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* debugging.
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*/
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typedef struct Node
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{
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NodeTag type;
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} Node;
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#define nodeTag(nodeptr) (((Node*)(nodeptr))->type)
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/*
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* newNode -
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* create a new node of the specified size and tag the node with the
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* specified tag.
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*
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* !WARNING!: Avoid using newNode directly. You should be using the
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* macro makeNode. eg. to create a Query node, use makeNode(Query)
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*
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* There is no way to dereference the palloc'ed pointer to assign the
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* tag, and also return the pointer itself, so we need a holder variable.
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* Fortunately, this macro isn't recursive so we just define
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* a global variable for this purpose.
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*/
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extern DLLIMPORT Node *newNodeMacroHolder;
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#define newNode(size, tag) \
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( \
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AssertMacro((size) >= sizeof(Node)), /* need the tag, at least */ \
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newNodeMacroHolder = (Node *) palloc0fast(size), \
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newNodeMacroHolder->type = (tag), \
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newNodeMacroHolder \
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)
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#define makeNode(_type_) ((_type_ *) newNode(sizeof(_type_),T_##_type_))
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#define NodeSetTag(nodeptr,t) (((Node*)(nodeptr))->type = (t))
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#define IsA(nodeptr,_type_) (nodeTag(nodeptr) == T_##_type_)
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/* ----------------------------------------------------------------
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* extern declarations follow
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* ----------------------------------------------------------------
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*/
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/*
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* nodes/{outfuncs.c,print.c}
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*/
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extern char *nodeToString(void *obj);
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/*
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* nodes/{readfuncs.c,read.c}
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*/
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extern void *stringToNode(char *str);
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/*
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* nodes/copyfuncs.c
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*/
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extern void *copyObject(void *obj);
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/*
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* nodes/equalfuncs.c
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*/
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extern bool equal(void *a, void *b);
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/*
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* Typedefs for identifying qualifier selectivities and plan costs as such.
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* These are just plain "double"s, but declaring a variable as Selectivity
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* or Cost makes the intent more obvious.
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*
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* These could have gone into plannodes.h or some such, but many files
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* depend on them...
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*/
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typedef double Selectivity; /* fraction of tuples a qualifier will pass */
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typedef double Cost; /* execution cost (in page-access units) */
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/*
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* CmdType -
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* enums for type of operation represented by a Query
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*
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* ??? could have put this in parsenodes.h but many files not in the
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* optimizer also need this...
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*/
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typedef enum CmdType
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{
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CMD_UNKNOWN,
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CMD_SELECT, /* select stmt */
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CMD_UPDATE, /* update stmt */
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CMD_INSERT, /* insert stmt */
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CMD_DELETE,
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CMD_UTILITY, /* cmds like create, destroy, copy, vacuum,
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* etc. */
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CMD_NOTHING /* dummy command for instead nothing rules
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* with qual */
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} CmdType;
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/*
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* JoinType -
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* enums for types of relation joins
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*
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* JoinType determines the exact semantics of joining two relations using
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* a matching qualification. For example, it tells what to do with a tuple
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* that has no match in the other relation.
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*
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* This is needed in both parsenodes.h and plannodes.h, so put it here...
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*/
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typedef enum JoinType
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{
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/*
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* The canonical kinds of joins
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*/
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JOIN_INNER, /* matching tuple pairs only */
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JOIN_LEFT, /* pairs + unmatched outer tuples */
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JOIN_FULL, /* pairs + unmatched outer + unmatched inner */
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JOIN_RIGHT, /* pairs + unmatched inner tuples */
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/*
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* These are used for queries like WHERE foo IN (SELECT bar FROM ...).
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* Only JOIN_IN is actually implemented in the executor; the others are
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* defined for internal use in the planner.
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*/
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JOIN_IN, /* at most one result per outer row */
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JOIN_REVERSE_IN, /* at most one result per inner row */
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JOIN_UNIQUE_OUTER, /* outer path must be made unique */
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JOIN_UNIQUE_INNER /* inner path must be made unique */
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/*
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* We might need additional join types someday.
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*/
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} JoinType;
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#define IS_OUTER_JOIN(jointype) \
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((jointype) == JOIN_LEFT || \
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(jointype) == JOIN_FULL || \
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(jointype) == JOIN_RIGHT)
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#endif /* NODES_H */
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