325 lines
6.3 KiB
C
325 lines
6.3 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) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: nodes.h,v 1.63 2000/01/26 05:58:16 momjian 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 number 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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*/
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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 PLAN NODES (plannodes.h)
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*---------------------
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*/
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T_Plan = 10,
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T_Result,
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T_Append,
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T_Scan,
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T_SeqScan,
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T_IndexScan,
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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_Noname,
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T_Material,
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T_Sort,
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T_Agg,
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T_Unique,
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T_Hash,
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T_Choose,
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T_Group,
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T_SubPlan,
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T_TidScan,
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/*---------------------
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* TAGS FOR PRIMITIVE NODES (primnodes.h)
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*---------------------
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*/
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T_Resdom = 100,
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T_Fjoin,
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T_Expr,
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T_Var,
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T_Oper,
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T_Const,
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T_Param,
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T_Aggref,
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T_SubLink,
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T_Func,
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T_Array,
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T_ArrayRef,
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T_Iter,
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/*---------------------
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* TAGS FOR PLANNER NODES (relation.h)
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*---------------------
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*/
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T_RelOptInfo = 200,
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T_Path,
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T_IndexPath,
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T_NestPath,
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T_MergePath,
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T_HashPath,
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T_PathKeyItem,
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T_RestrictInfo,
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T_JoinInfo,
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T_Stream,
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T_TidPath,
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T_IndexOptInfo,
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/*---------------------
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* TAGS FOR EXECUTOR NODES (execnodes.h)
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*---------------------
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*/
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T_IndexInfo = 300,
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T_RelationInfo,
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T_TupleCount,
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T_TupleTableSlot,
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T_ExprContext,
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T_ProjectionInfo,
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T_JunkFilter,
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T_EState,
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T_BaseNode,
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T_CommonState,
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T_ResultState,
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T_AppendState,
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T_CommonScanState,
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T_ScanState,
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T_IndexScanState,
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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_AggState,
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T_GroupState,
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T_SortState,
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T_UniqueState,
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T_HashState,
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T_TidScanState,
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/*---------------------
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* TAGS FOR MEMORY NODES (memnodes.h)
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*---------------------
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*/
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T_MemoryContext = 400,
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T_GlobalMemory,
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T_PortalMemoryContext,
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T_PortalVariableMemory,
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T_PortalHeapMemory,
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/*---------------------
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* TAGS FOR VALUE NODES (pg_list.h)
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*---------------------
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*/
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T_Value = 500,
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T_List,
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T_Integer,
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T_Float,
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T_String,
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T_Null,
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/*---------------------
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* TAGS FOR PARSE TREE NODES (parsenode.h)
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*---------------------
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*/
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T_Query = 600,
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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_AggregateStmt,
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T_ChangeACLStmt,
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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_VersionStmt,
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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_ExtendStmt,
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T_FetchStmt,
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T_IndexStmt,
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T_ProcedureStmt,
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T_RemoveAggrStmt,
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T_RemoveFuncStmt,
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T_RemoveOperStmt,
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T_RemoveStmt,
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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_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_VariableSetStmt,
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T_VariableShowStmt,
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T_VariableResetStmt,
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T_CreateTrigStmt,
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T_DropTrigStmt,
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T_CreatePLangStmt,
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T_DropPLangStmt,
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T_CreateUserStmt,
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T_AlterUserStmt,
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T_DropUserStmt,
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T_LockStmt,
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T_ConstraintsSetStmt,
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T_CreateGroupStmt,
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T_AlterGroupStmt,
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T_DropGroupStmt,
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T_A_Expr = 700,
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T_Attr,
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T_A_Const,
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T_ParamNo,
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T_Ident,
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T_FuncCall,
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T_A_Indices,
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T_ResTarget,
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T_TypeCast,
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T_RelExpr,
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T_SortGroupBy,
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T_RangeVar,
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T_TypeName,
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T_IndexElem,
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T_ColumnDef,
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T_Constraint,
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T_DefElem,
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T_TargetEntry,
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T_RangeTblEntry,
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T_SortClause,
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T_GroupClause,
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T_SubSelect,
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T_JoinExpr,
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T_CaseExpr,
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T_CaseWhen,
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T_RowMark,
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T_FkConstraint
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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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#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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* IsA functions (no inheritance any more)
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* ----------------------------------------------------------------
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*/
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#define IsA_JoinPath(jp) \
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(IsA(jp, NestPath) || IsA(jp, MergePath) || IsA(jp, HashPath))
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#define IsA_Join(jp) \
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(IsA(jp, Join) || IsA(jp, NestLoop) || \
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IsA(jp, MergeJoin) || IsA(jp, HashJoin))
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#define IsA_Noname(t) \
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(IsA(t, Noname) || IsA(t, Material) || IsA(t, Sort) || \
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IsA(t, Unique))
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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/nodes.c
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*/
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extern Node *newNode(Size size, NodeTag tag);
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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 to aid debugging
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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 (formerly retrieve) */
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CMD_UPDATE, /* update stmt (formerly replace) */
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CMD_INSERT, /* insert stmt (formerly append) */
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CMD_DELETE,
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CMD_UTILITY, /* cmds like create, destroy, copy,
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* vacuum, 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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#endif /* NODES_H */
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