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Added functionality for automatic trigger creation during CREATE TABLE. Added ON DELETE RESTRICT and some others. Jan
1098 lines
29 KiB
C
1098 lines
29 KiB
C
/*-------------------------------------------------------------------------
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*
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* parsenodes.h
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* definitions for parse tree nodes
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: parsenodes.h,v 1.88 1999/12/06 18:02:47 wieck Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PARSENODES_H
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#define PARSENODES_H
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#include "nodes/primnodes.h"
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/*****************************************************************************
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* Query Tree
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*****************************************************************************/
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/*
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* Query -
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* all statments are turned into a Query tree (via transformStmt)
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* for further processing by the optimizer
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* utility statements (i.e. non-optimizable statements)
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* have the *utilityStmt field set.
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*
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* we need the isPortal flag because portal names can be null too; can
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* get rid of it if we support CURSOR as a commandType.
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*
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*/
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typedef struct Query
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{
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NodeTag type;
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CmdType commandType; /* select|insert|update|delete|utility */
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Node *utilityStmt; /* non-null if this is a non-optimizable
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* statement */
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int resultRelation; /* target relation (index to rtable) */
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char *into; /* portal (cursor) name */
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bool isPortal; /* is this a retrieve into portal? */
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bool isBinary; /* binary portal? */
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bool isTemp; /* is 'into' a temp table? */
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bool unionall; /* union without unique sort */
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bool hasAggs; /* has aggregates in tlist or havingQual */
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bool hasSubLinks; /* has subquery SubLink */
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List *rtable; /* list of range table entries */
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List *targetList; /* target list (of TargetEntry) */
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Node *qual; /* qualifications applied to tuples */
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List *rowMark; /* list of RowMark entries */
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char *uniqueFlag; /* NULL, '*', or Unique attribute name */
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List *sortClause; /* a list of SortClause's */
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List *groupClause; /* a list of GroupClause's */
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Node *havingQual; /* qualifications applied to groups */
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List *intersectClause;
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List *unionClause; /* unions are linked under the previous
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* query */
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Node *limitOffset; /* # of result tuples to skip */
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Node *limitCount; /* # of result tuples to return */
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/* internal to planner */
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List *base_rel_list; /* list of base-relation RelOptInfos */
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List *join_rel_list; /* list of join-relation RelOptInfos */
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List *query_pathkeys; /* pathkeys for query_planner()'s result */
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} Query;
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/*****************************************************************************
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* Other Statements (no optimizations required)
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*
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* Some of them require a little bit of transformation (which is also
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* done by transformStmt). The whole structure is then passed on to
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* ProcessUtility (by-passing the optimization step) as the utilityStmt
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* field in Query.
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*****************************************************************************/
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/* ----------------------
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* Add Column Statement
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* ----------------------
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*/
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typedef struct AddAttrStmt
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{
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NodeTag type;
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char *relname; /* the relation to add attr */
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bool inh; /* add recursively to children? */
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Node *colDef; /* the attribute definition */
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} AddAttrStmt;
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/* ----------------------
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* Change ACL Statement
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* ----------------------
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*/
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typedef struct ChangeACLStmt
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{
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NodeTag type;
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struct AclItem *aclitem;
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unsigned modechg;
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List *relNames;
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} ChangeACLStmt;
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/* ----------------------
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* Close Portal Statement
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* ----------------------
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*/
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typedef struct ClosePortalStmt
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{
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NodeTag type;
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char *portalname; /* name of the portal (cursor) */
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} ClosePortalStmt;
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/* ----------------------
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* Copy Statement
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* ----------------------
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*/
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typedef struct CopyStmt
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{
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NodeTag type;
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bool binary; /* is a binary copy? */
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char *relname; /* the relation to copy */
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bool oids; /* copy oid's? */
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int direction; /* TO or FROM */
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char *filename; /* if NULL, use stdin/stdout */
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char *delimiter; /* delimiter character, \t by default */
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} CopyStmt;
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/* ----------------------
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* Create Table Statement
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* ----------------------
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*/
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typedef struct CreateStmt
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{
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NodeTag type;
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bool istemp; /* is this a temp table? */
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char *relname; /* name of relation to create */
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List *tableElts; /* column definitions (list of ColumnDef) */
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List *inhRelnames; /* relations to inherit from (list of
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* T_String Values) */
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List *constraints; /* list of constraints (Constraint nodes) */
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} CreateStmt;
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typedef enum ConstrType /* types of constraints */
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{
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CONSTR_NULL, CONSTR_NOTNULL, CONSTR_DEFAULT, CONSTR_CHECK,
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CONSTR_PRIMARY, CONSTR_UNIQUE
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} ConstrType;
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/*
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* For constraints that use expressions (CONSTR_DEFAULT, CONSTR_CHECK)
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* we may have the expression in either "raw" form (an untransformed
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* parse tree) or "cooked" form (the nodeToString representation of
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* an executable expression tree), depending on how this Constraint
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* node was created (by parsing, or by inheritance from an existing
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* relation). We should never have both in the same node!
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*/
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typedef struct Constraint
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{
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NodeTag type;
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ConstrType contype;
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char *name; /* name */
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Node *raw_expr; /* untransformed parse tree */
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char *cooked_expr; /* nodeToString representation */
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List *keys; /* list of primary keys */
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} Constraint;
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/* ----------
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* Definitions for FOREIGN KEY constraints in CreateStmt
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* ----------
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*/
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#define FKCONSTR_ON_KEY_NOACTION 0x0000
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#define FKCONSTR_ON_KEY_RESTRICT 0x0001
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#define FKCONSTR_ON_KEY_CASCADE 0x0002
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#define FKCONSTR_ON_KEY_SETNULL 0x0004
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#define FKCONSTR_ON_KEY_SETDEFAULT 0x0008
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#define FKCONSTR_ON_DELETE_MASK 0x000F
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#define FKCONSTR_ON_DELETE_SHIFT 0
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#define FKCONSTR_ON_UPDATE_MASK 0x00F0
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#define FKCONSTR_ON_UPDATE_SHIFT 4
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typedef struct FkConstraint
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{
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NodeTag type;
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char *constr_name; /* Constraint name */
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char *pktable_name; /* Primary key table name */
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List *fk_attrs; /* Attributes of foreign key */
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List *pk_attrs; /* Corresponding attrs in PK table */
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char *match_type; /* FULL or PARTIAL */
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int32 actions; /* ON DELETE/UPDATE actions */
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bool deferrable; /* DEFERRABLE */
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bool initdeferred; /* INITIALLY DEFERRED */
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} FkConstraint;
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/* ----------------------
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* Create/Drop TRIGGER Statements
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* ----------------------
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*/
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typedef struct CreateTrigStmt
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{
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NodeTag type;
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char *trigname; /* TRIGGER' name */
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char *relname; /* triggered relation */
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char *funcname; /* function to call (or NULL) */
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List *args; /* list of (T_String) Values or NULL */
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bool before; /* BEFORE/AFTER */
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bool row; /* ROW/STATEMENT */
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char actions[4]; /* Insert, Update, Delete */
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char *lang; /* NULL (which means Clanguage) */
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char *text; /* AS 'text' */
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List *attr; /* UPDATE OF a, b,... (NI) or NULL */
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char *when; /* WHEN 'a > 10 ...' (NI) or NULL */
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/* The following are used for referential */
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/* integrity constraint triggers */
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bool isconstraint; /* This is an RI trigger */
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bool deferrable; /* [NOT] DEFERRABLE */
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bool initdeferred; /* INITIALLY {DEFERRED|IMMEDIATE} */
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char *constrrelname; /* opposite relation */
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} CreateTrigStmt;
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typedef struct DropTrigStmt
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{
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NodeTag type;
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char *trigname; /* TRIGGER' name */
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char *relname; /* triggered relation */
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} DropTrigStmt;
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/* ----------------------
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* Create/Drop PROCEDURAL LANGUAGE Statement
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* ----------------------
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*/
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typedef struct CreatePLangStmt
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{
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NodeTag type;
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char *plname; /* PL name */
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char *plhandler; /* PL call handler function */
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char *plcompiler; /* lancompiler text */
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bool pltrusted; /* PL is trusted */
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} CreatePLangStmt;
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typedef struct DropPLangStmt
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{
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NodeTag type;
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char *plname; /* PL name */
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} DropPLangStmt;
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/* ----------------------
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* Create/Alter/Drop User Statements
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* ----------------------
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*/
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typedef struct CreateUserStmt
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{
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NodeTag type;
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char *user; /* PostgreSQL user login */
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char *password; /* PostgreSQL user password */
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int sysid; /* PgSQL system id (-1 if don't care) */
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bool *createdb; /* Can the user create databases? */
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bool *createuser; /* Can this user create users? */
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List *groupElts; /* The groups the user is a member of */
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char *validUntil; /* The time the login is valid until */
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} CreateUserStmt;
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typedef CreateUserStmt AlterUserStmt;
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typedef struct DropUserStmt
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{
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NodeTag type;
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char *user; /* PostgreSQL user login */
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} DropUserStmt;
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/* ----------------------
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* Create SEQUENCE Statement
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* ----------------------
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*/
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typedef struct CreateSeqStmt
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{
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NodeTag type;
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char *seqname; /* the relation to create */
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List *options;
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} CreateSeqStmt;
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/* ----------------------
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* Create Version Statement
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* ----------------------
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*/
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typedef struct VersionStmt
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{
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NodeTag type;
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char *relname; /* the new relation */
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int direction; /* FORWARD | BACKWARD */
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char *fromRelname; /* relation to create a version */
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char *date; /* date of the snapshot */
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} VersionStmt;
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/* ----------------------
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* Create {Operator|Type|Aggregate} Statement
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* ----------------------
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*/
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typedef struct DefineStmt
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{
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NodeTag type;
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int defType; /* OPERATOR|P_TYPE|AGGREGATE */
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char *defname;
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List *definition; /* a list of DefElem */
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} DefineStmt;
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/* ----------------------
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* Drop Table Statement
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* ----------------------
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*/
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typedef struct DestroyStmt
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{
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NodeTag type;
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List *relNames; /* relations to be dropped */
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bool sequence;
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} DestroyStmt;
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/* ----------------------
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* Truncate Table Statement
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* ----------------------
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*/
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typedef struct TruncateStmt
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{
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NodeTag type;
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char *relName; /* relation to be truncated */
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} TruncateStmt;
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/* ----------------------
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* Comment On Statement
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* ----------------------
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*/
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typedef struct CommentStmt
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{
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NodeTag type;
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int objtype; /* Object's type */
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char *objname; /* Name of the object */
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char *objproperty; /* Property Id (such as column) */
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List *objlist; /* Arguments for VAL objects */
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char *comment; /* The comment to insert */
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} CommentStmt;
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/* ----------------------
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* Extend Index Statement
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* ----------------------
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*/
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typedef struct ExtendStmt
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{
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NodeTag type;
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char *idxname; /* name of the index */
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Node *whereClause; /* qualifications */
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List *rangetable; /* range table, filled in by
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* transformStmt() */
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} ExtendStmt;
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/* ----------------------
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* Begin Recipe Statement
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* ----------------------
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*/
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typedef struct RecipeStmt
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{
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NodeTag type;
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char *recipeName; /* name of the recipe */
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} RecipeStmt;
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/* ----------------------
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* Fetch Statement
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* ----------------------
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*/
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typedef struct FetchStmt
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{
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NodeTag type;
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int direction; /* FORWARD or BACKWARD */
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int howMany; /* amount to fetch ("ALL" --> 0) */
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char *portalname; /* name of portal (cursor) */
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bool ismove; /* TRUE if MOVE */
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} FetchStmt;
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/* ----------------------
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* Create Index Statement
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* ----------------------
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*/
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typedef struct IndexStmt
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{
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NodeTag type;
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char *idxname; /* name of the index */
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char *relname; /* name of relation to index on */
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char *accessMethod; /* name of acess methood (eg. btree) */
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List *indexParams; /* a list of IndexElem */
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List *withClause; /* a list of DefElem */
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Node *whereClause; /* qualifications */
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List *rangetable; /* range table, filled in by
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* transformStmt() */
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bool *lossy; /* is index lossy? */
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bool unique; /* is index unique? */
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bool primary; /* is index on primary key? */
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} IndexStmt;
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/* ----------------------
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* Create Function Statement
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* ----------------------
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*/
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typedef struct ProcedureStmt
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{
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NodeTag type;
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char *funcname; /* name of function to create */
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List *defArgs; /* list of definitions a list of strings
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* (as Value *) */
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Node *returnType; /* the return type (as a string or a
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* TypeName (ie.setof) */
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List *withClause; /* a list of DefElem */
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List *as; /* the SQL statement or filename */
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char *language; /* C or SQL */
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} ProcedureStmt;
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/* ----------------------
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* Drop Aggregate Statement
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* ----------------------
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*/
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typedef struct RemoveAggrStmt
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{
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NodeTag type;
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char *aggname; /* aggregate to drop */
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char *aggtype; /* for this type */
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} RemoveAggrStmt;
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/* ----------------------
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* Drop Function Statement
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* ----------------------
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*/
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typedef struct RemoveFuncStmt
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{
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NodeTag type;
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char *funcname; /* function to drop */
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List *args; /* types of the arguments */
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} RemoveFuncStmt;
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/* ----------------------
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* Drop Operator Statement
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* ----------------------
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*/
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typedef struct RemoveOperStmt
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{
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NodeTag type;
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char *opname; /* operator to drop */
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List *args; /* types of the arguments */
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} RemoveOperStmt;
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/* ----------------------
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* Drop {Type|Index|Rule|View} Statement
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* ----------------------
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*/
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typedef struct RemoveStmt
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{
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NodeTag type;
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int removeType; /* P_TYPE|INDEX|RULE|VIEW */
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char *name; /* name to drop */
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} RemoveStmt;
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/* ----------------------
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* Alter Table Statement
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* ----------------------
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*/
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typedef struct RenameStmt
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{
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NodeTag type;
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char *relname; /* relation to be altered */
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bool inh; /* recursively alter children? */
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char *column; /* if NULL, rename the relation name to
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* the new name. Otherwise, rename this
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* column name. */
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char *newname; /* the new name */
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} RenameStmt;
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/* ----------------------
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* Create Rule Statement
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* ----------------------
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*/
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typedef struct RuleStmt
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{
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NodeTag type;
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char *rulename; /* name of the rule */
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Node *whereClause; /* qualifications */
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CmdType event; /* RETRIEVE */
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struct Attr *object; /* object affected */
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bool instead; /* is a 'do instead'? */
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List *actions; /* the action statements */
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} RuleStmt;
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/* ----------------------
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* Notify Statement
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* ----------------------
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*/
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typedef struct NotifyStmt
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{
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NodeTag type;
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char *relname; /* relation to notify */
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} NotifyStmt;
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|
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/* ----------------------
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* Listen Statement
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* ----------------------
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*/
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typedef struct ListenStmt
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{
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NodeTag type;
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char *relname; /* relation to listen on */
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} ListenStmt;
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/* ----------------------
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* Unlisten Statement
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* ----------------------
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*/
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typedef struct UnlistenStmt
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{
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NodeTag type;
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char *relname; /* relation to unlisten on */
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} UnlistenStmt;
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/* ----------------------
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* {Begin|Abort|End} Transaction Statement
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* ----------------------
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*/
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typedef struct TransactionStmt
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{
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NodeTag type;
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int command; /* BEGIN|END|ABORT */
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} TransactionStmt;
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/* ----------------------
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* Create View Statement
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* ----------------------
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*/
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typedef struct ViewStmt
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{
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NodeTag type;
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char *viewname; /* name of the view */
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Query *query; /* the SQL statement */
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} ViewStmt;
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/* ----------------------
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* Load Statement
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* ----------------------
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*/
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typedef struct LoadStmt
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{
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NodeTag type;
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char *filename; /* file to load */
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} LoadStmt;
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|
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/* ----------------------
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* Createdb Statement
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* ----------------------
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*/
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typedef struct CreatedbStmt
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{
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NodeTag type;
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char *dbname; /* database to create */
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char *dbpath; /* location of database */
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int encoding; /* default encoding (see regex/pg_wchar.h) */
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} CreatedbStmt;
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|
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/* ----------------------
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* Destroydb Statement
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* ----------------------
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*/
|
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typedef struct DestroydbStmt
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{
|
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NodeTag type;
|
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char *dbname; /* database to drop */
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} DestroydbStmt;
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|
|
|
/* ----------------------
|
|
* Cluster Statement (support pbrown's cluster index implementation)
|
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* ----------------------
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|
*/
|
|
typedef struct ClusterStmt
|
|
{
|
|
NodeTag type;
|
|
char *relname; /* relation being indexed */
|
|
char *indexname; /* original index defined */
|
|
} ClusterStmt;
|
|
|
|
/* ----------------------
|
|
* Vacuum Statement
|
|
* ----------------------
|
|
*/
|
|
typedef struct VacuumStmt
|
|
{
|
|
NodeTag type;
|
|
bool verbose; /* print status info */
|
|
bool analyze; /* analyze data */
|
|
char *vacrel; /* table to vacuum */
|
|
List *va_spec; /* columns to analyse */
|
|
} VacuumStmt;
|
|
|
|
/* ----------------------
|
|
* Explain Statement
|
|
* ----------------------
|
|
*/
|
|
typedef struct ExplainStmt
|
|
{
|
|
NodeTag type;
|
|
Query *query; /* the query */
|
|
bool verbose; /* print plan info */
|
|
} ExplainStmt;
|
|
|
|
/* ----------------------
|
|
* Set Statement
|
|
* ----------------------
|
|
*/
|
|
|
|
typedef struct VariableSetStmt
|
|
{
|
|
NodeTag type;
|
|
char *name;
|
|
char *value;
|
|
} VariableSetStmt;
|
|
|
|
/* ----------------------
|
|
* Show Statement
|
|
* ----------------------
|
|
*/
|
|
|
|
typedef struct VariableShowStmt
|
|
{
|
|
NodeTag type;
|
|
char *name;
|
|
} VariableShowStmt;
|
|
|
|
/* ----------------------
|
|
* Reset Statement
|
|
* ----------------------
|
|
*/
|
|
|
|
typedef struct VariableResetStmt
|
|
{
|
|
NodeTag type;
|
|
char *name;
|
|
} VariableResetStmt;
|
|
|
|
/* ----------------------
|
|
* LOCK Statement
|
|
* ----------------------
|
|
*/
|
|
typedef struct LockStmt
|
|
{
|
|
NodeTag type;
|
|
char *relname; /* relation to lock */
|
|
int mode; /* lock mode */
|
|
} LockStmt;
|
|
|
|
|
|
/* ----------------------
|
|
* SET CONSTRAINTS Statement
|
|
* ----------------------
|
|
*/
|
|
typedef struct ConstraintsSetStmt
|
|
{
|
|
NodeTag type;
|
|
List *constraints;
|
|
bool deferred;
|
|
} ConstraintsSetStmt;
|
|
|
|
|
|
/*****************************************************************************
|
|
* Optimizable Statements
|
|
*****************************************************************************/
|
|
|
|
/* ----------------------
|
|
* Insert Statement
|
|
* ----------------------
|
|
*/
|
|
typedef struct InsertStmt
|
|
{
|
|
NodeTag type;
|
|
char *relname; /* relation to insert into */
|
|
char *unique; /* NULL, '*', or unique attribute name */
|
|
List *cols; /* names of the columns */
|
|
List *targetList; /* the target list (of ResTarget) */
|
|
List *fromClause; /* the from clause */
|
|
Node *whereClause; /* qualifications */
|
|
List *groupClause; /* GROUP BY clauses */
|
|
Node *havingClause; /* having conditional-expression */
|
|
List *unionClause; /* union subselect parameters */
|
|
bool unionall; /* union without unique sort */
|
|
List *intersectClause;
|
|
List *forUpdate; /* FOR UPDATE clause */
|
|
} InsertStmt;
|
|
|
|
/* ----------------------
|
|
* Delete Statement
|
|
* ----------------------
|
|
*/
|
|
typedef struct DeleteStmt
|
|
{
|
|
NodeTag type;
|
|
char *relname; /* relation to delete from */
|
|
Node *whereClause; /* qualifications */
|
|
} DeleteStmt;
|
|
|
|
/* ----------------------
|
|
* Update Statement
|
|
* ----------------------
|
|
*/
|
|
typedef struct UpdateStmt
|
|
{
|
|
NodeTag type;
|
|
char *relname; /* relation to update */
|
|
List *targetList; /* the target list (of ResTarget) */
|
|
Node *whereClause; /* qualifications */
|
|
List *fromClause; /* the from clause */
|
|
} UpdateStmt;
|
|
|
|
/* ----------------------
|
|
* Select Statement
|
|
* ----------------------
|
|
*/
|
|
typedef struct SelectStmt
|
|
{
|
|
NodeTag type;
|
|
char *unique; /* NULL, '*', or unique attribute name */
|
|
char *into; /* name of table (for select into table) */
|
|
List *targetList; /* the target list (of ResTarget) */
|
|
List *fromClause; /* the from clause */
|
|
Node *whereClause; /* qualifications */
|
|
List *groupClause; /* GROUP BY clauses */
|
|
Node *havingClause; /* having conditional-expression */
|
|
List *intersectClause;
|
|
List *exceptClause;
|
|
|
|
List *unionClause; /* union subselect parameters */
|
|
List *sortClause; /* sort clause (a list of SortGroupBy's) */
|
|
char *portalname; /* the portal (cursor) to create */
|
|
bool binary; /* a binary (internal) portal? */
|
|
bool istemp; /* into is a temp table */
|
|
bool unionall; /* union without unique sort */
|
|
Node *limitOffset; /* # of result tuples to skip */
|
|
Node *limitCount; /* # of result tuples to return */
|
|
List *forUpdate; /* FOR UPDATE clause */
|
|
} SelectStmt;
|
|
|
|
/****************************************************************************
|
|
* Supporting data structures for Parse Trees
|
|
****************************************************************************/
|
|
|
|
/*
|
|
* TypeName - specifies a type in definitions
|
|
*/
|
|
typedef struct TypeName
|
|
{
|
|
NodeTag type;
|
|
char *name; /* name of the type */
|
|
bool timezone; /* timezone specified? */
|
|
bool setof; /* is a set? */
|
|
int32 typmod; /* type modifier */
|
|
List *arrayBounds; /* array bounds */
|
|
} TypeName;
|
|
|
|
/*
|
|
* ParamNo - specifies a parameter reference
|
|
*/
|
|
typedef struct ParamNo
|
|
{
|
|
NodeTag type;
|
|
int number; /* the number of the parameter */
|
|
TypeName *typename; /* the typecast */
|
|
List *indirection; /* array references */
|
|
} ParamNo;
|
|
|
|
/*
|
|
* A_Expr - binary expressions
|
|
*/
|
|
typedef struct A_Expr
|
|
{
|
|
NodeTag type;
|
|
int oper; /* type of operation
|
|
* {OP,OR,AND,NOT,ISNULL,NOTNULL} */
|
|
char *opname; /* name of operator/function */
|
|
Node *lexpr; /* left argument */
|
|
Node *rexpr; /* right argument */
|
|
} A_Expr;
|
|
|
|
/*
|
|
* Attr -
|
|
* specifies an Attribute (ie. a Column); could have nested dots or
|
|
* array references.
|
|
*
|
|
*/
|
|
typedef struct Attr
|
|
{
|
|
NodeTag type;
|
|
char *relname; /* name of relation (can be "*") */
|
|
ParamNo *paramNo; /* or a parameter */
|
|
List *attrs; /* attributes (possibly nested); list of
|
|
* Values (strings) */
|
|
List *indirection; /* array refs (list of A_Indices') */
|
|
} Attr;
|
|
|
|
/*
|
|
* A_Const - a constant expression
|
|
*/
|
|
typedef struct A_Const
|
|
{
|
|
NodeTag type;
|
|
Value val; /* the value (with the tag) */
|
|
TypeName *typename; /* typecast */
|
|
} A_Const;
|
|
|
|
/*
|
|
* CaseExpr - a CASE expression
|
|
*/
|
|
typedef struct CaseExpr
|
|
{
|
|
NodeTag type;
|
|
Oid casetype;
|
|
Node *arg; /* implicit equality comparison argument */
|
|
List *args; /* the arguments (list of WHEN clauses) */
|
|
Node *defresult; /* the default result (ELSE clause) */
|
|
} CaseExpr;
|
|
|
|
/*
|
|
* CaseWhen - an argument to a CASE expression
|
|
*/
|
|
typedef struct CaseWhen
|
|
{
|
|
NodeTag type;
|
|
Node *expr; /* comparison expression */
|
|
Node *result; /* substitution result */
|
|
} CaseWhen;
|
|
|
|
/*
|
|
* ColumnDef - column definition (used in various creates)
|
|
*
|
|
* If the column has a default value, we may have the value expression
|
|
* in either "raw" form (an untransformed parse tree) or "cooked" form
|
|
* (the nodeToString representation of an executable expression tree),
|
|
* depending on how this ColumnDef node was created (by parsing, or by
|
|
* inheritance from an existing relation). We should never have both
|
|
* in the same node!
|
|
*
|
|
* The constraints list may contain a CONSTR_DEFAULT item in a raw
|
|
* parsetree produced by gram.y, but transformCreateStmt will remove
|
|
* the item and set raw_default instead. CONSTR_DEFAULT items
|
|
* should not appear in any subsequent processing.
|
|
*/
|
|
typedef struct ColumnDef
|
|
{
|
|
NodeTag type;
|
|
char *colname; /* name of column */
|
|
TypeName *typename; /* type of column */
|
|
bool is_not_null; /* flag to NOT NULL constraint */
|
|
bool is_sequence; /* is a sequence? */
|
|
Node *raw_default; /* default value (untransformed parse tree) */
|
|
char *cooked_default; /* nodeToString representation */
|
|
List *constraints; /* other constraints on column */
|
|
} ColumnDef;
|
|
|
|
/*
|
|
* Ident -
|
|
* an identifier (could be an attribute or a relation name). Depending
|
|
* on the context at transformStmt time, the identifier is treated as
|
|
* either a relation name (in which case, isRel will be set) or an
|
|
* attribute (in which case, it will be transformed into an Attr).
|
|
*/
|
|
typedef struct Ident
|
|
{
|
|
NodeTag type;
|
|
char *name; /* its name */
|
|
List *indirection; /* array references */
|
|
bool isRel; /* is a relation - filled in by
|
|
* transformExpr() */
|
|
} Ident;
|
|
|
|
/*
|
|
* FuncCall - a function/aggregate invocation
|
|
*/
|
|
typedef struct FuncCall
|
|
{
|
|
NodeTag type;
|
|
char *funcname; /* name of function */
|
|
List *args; /* the arguments (list of exprs) */
|
|
} FuncCall;
|
|
|
|
/*
|
|
* A_Indices - array reference or bounds ([lidx:uidx] or [uidx])
|
|
*/
|
|
typedef struct A_Indices
|
|
{
|
|
NodeTag type;
|
|
Node *lidx; /* could be NULL */
|
|
Node *uidx;
|
|
} A_Indices;
|
|
|
|
/*
|
|
* ResTarget -
|
|
* result target (used in target list of pre-transformed Parse trees)
|
|
*
|
|
* In a SELECT or INSERT target list, 'name' is either NULL or
|
|
* the column name assigned to the value. (If there is an 'AS ColumnLabel'
|
|
* clause, the grammar sets 'name' from it; otherwise 'name' is initially NULL
|
|
* and is filled in during the parse analysis phase.)
|
|
* The 'indirection' field is not used at all.
|
|
*
|
|
* In an UPDATE target list, 'name' is the name of the destination column,
|
|
* and 'indirection' stores any subscripts attached to the destination.
|
|
* That is, our representation is UPDATE table SET name [indirection] = val.
|
|
*/
|
|
typedef struct ResTarget
|
|
{
|
|
NodeTag type;
|
|
char *name; /* column name or NULL */
|
|
List *indirection; /* subscripts for destination column, or
|
|
* NIL */
|
|
Node *val; /* the value expression to compute or
|
|
* assign */
|
|
} ResTarget;
|
|
|
|
/*
|
|
* RelExpr - relation expressions
|
|
*/
|
|
typedef struct RelExpr
|
|
{
|
|
NodeTag type;
|
|
char *relname; /* the relation name */
|
|
bool inh; /* inheritance query */
|
|
} RelExpr;
|
|
|
|
/*
|
|
* SortGroupBy - for ORDER BY clause
|
|
*/
|
|
typedef struct SortGroupBy
|
|
{
|
|
NodeTag type;
|
|
char *useOp; /* operator to use */
|
|
Node *node; /* Expression */
|
|
} SortGroupBy;
|
|
|
|
/*
|
|
* RangeVar - range variable, used in FROM clauses
|
|
*/
|
|
typedef struct RangeVar
|
|
{
|
|
NodeTag type;
|
|
RelExpr *relExpr; /* the relation expression */
|
|
char *name; /* the name to be referenced (optional) */
|
|
} RangeVar;
|
|
|
|
/*
|
|
* IndexElem - index parameters (used in CREATE INDEX)
|
|
*/
|
|
typedef struct IndexElem
|
|
{
|
|
NodeTag type;
|
|
char *name; /* name of index */
|
|
List *args; /* if not NULL, function index */
|
|
char *class;
|
|
TypeName *typename; /* type of index's keys (optional) */
|
|
} IndexElem;
|
|
|
|
/*
|
|
* DefElem -
|
|
* a definition (used in definition lists in the form of defname = arg)
|
|
*/
|
|
typedef struct DefElem
|
|
{
|
|
NodeTag type;
|
|
char *defname;
|
|
Node *arg; /* a (Value *) or a (TypeName *) */
|
|
} DefElem;
|
|
|
|
/*
|
|
* JoinExpr - for JOIN expressions
|
|
*/
|
|
typedef struct JoinExpr
|
|
{
|
|
NodeTag type;
|
|
int jointype;
|
|
RangeVar *larg;
|
|
Node *rarg;
|
|
List *quals;
|
|
} JoinExpr;
|
|
|
|
|
|
/****************************************************************************
|
|
* Nodes for a Query tree
|
|
****************************************************************************/
|
|
|
|
/*
|
|
* TargetEntry -
|
|
* a target entry (used in the transformed target list)
|
|
*
|
|
* one of resdom or fjoin is not NULL. a target list is
|
|
* ((<resdom | fjoin> expr) (<resdom | fjoin> expr) ...)
|
|
*/
|
|
typedef struct TargetEntry
|
|
{
|
|
NodeTag type;
|
|
Resdom *resdom; /* fjoin overload this to be a list?? */
|
|
Fjoin *fjoin;
|
|
Node *expr;
|
|
} TargetEntry;
|
|
|
|
/*--------------------
|
|
* RangeTblEntry -
|
|
* A range table is a List of RangeTblEntry nodes.
|
|
*
|
|
* Some of the following are only used in one of
|
|
* the parsing, optimizing, execution stages.
|
|
*
|
|
* inFromCl marks those range variables that are listed in the FROM clause.
|
|
* In SQL, the query can only refer to range variables listed in the
|
|
* FROM clause, but POSTQUEL allows you to refer to tables not listed,
|
|
* in which case a range table entry will be generated. We still support
|
|
* this POSTQUEL feature, although there is some doubt whether it's
|
|
* convenient or merely confusing. The flag is needed since an
|
|
* implicitly-added RTE shouldn't change the namespace for unqualified
|
|
* column names processed later, and it also shouldn't affect the
|
|
* expansion of '*'.
|
|
*
|
|
* inJoinSet marks those range variables that the planner should join
|
|
* over even if they aren't explicitly referred to in the query. For
|
|
* example, "SELECT COUNT(1) FROM tx" should produce the number of rows
|
|
* in tx. A more subtle example uses a POSTQUEL implicit RTE:
|
|
* SELECT COUNT(1) FROM tx WHERE TRUE OR (tx.f1 = ty.f2)
|
|
* Here we should get the product of the sizes of tx and ty. However,
|
|
* the query optimizer can simplify the WHERE clause to "TRUE", so
|
|
* ty will no longer be referred to explicitly; without a flag forcing
|
|
* it to be included in the join, we will get the wrong answer. So,
|
|
* a POSTQUEL implicit RTE must be marked inJoinSet but not inFromCl.
|
|
*--------------------
|
|
*/
|
|
typedef struct RangeTblEntry
|
|
{
|
|
NodeTag type;
|
|
char *relname; /* real name of the relation */
|
|
char *refname; /* the reference name (as specified in the
|
|
* FROM clause) */
|
|
Oid relid; /* OID of the relation */
|
|
bool inh; /* inheritance requested? */
|
|
bool inFromCl; /* present in FROM clause */
|
|
bool inJoinSet; /* planner must include this rel */
|
|
bool skipAcl; /* skip ACL check in executor */
|
|
} RangeTblEntry;
|
|
|
|
/*
|
|
* SortClause -
|
|
* representation of ORDER BY clauses
|
|
*
|
|
* tleSortGroupRef must match ressortgroupref of exactly one Resdom of the
|
|
* associated targetlist; that is the expression to be sorted (or grouped) by.
|
|
* sortop is the OID of the ordering operator.
|
|
*/
|
|
typedef struct SortClause
|
|
{
|
|
NodeTag type;
|
|
Index tleSortGroupRef;/* reference into targetlist */
|
|
Oid sortop; /* the sort operator to use */
|
|
} SortClause;
|
|
|
|
/*
|
|
* GroupClause -
|
|
* representation of GROUP BY clauses
|
|
*
|
|
* GroupClause is exactly like SortClause except for the nodetag value
|
|
* (and it's probably not even really necessary to have two different
|
|
* nodetags...). We have routines that operate interchangeably on both.
|
|
*/
|
|
typedef SortClause GroupClause;
|
|
|
|
#define ROW_MARK_FOR_UPDATE (1 << 0)
|
|
#define ROW_ACL_FOR_UPDATE (1 << 1)
|
|
|
|
typedef struct RowMark
|
|
{
|
|
NodeTag type;
|
|
Index rti; /* index in Query->rtable */
|
|
bits8 info; /* as above */
|
|
} RowMark;
|
|
|
|
#endif /* PARSENODES_H */
|