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postgres/src/include/nodes/parsenodes.h
Vadim B. Mikheev 3498d878cb SET TRANSACTION ISOLATION LEVEL ... 
LOCK TABLE IN ... MODE
...implemented
1998-12-18 09:10:39 +00:00

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/*-------------------------------------------------------------------------
*
* parsenodes.h--
* definitions for parse tree nodes
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: parsenodes.h,v 1.63 1998/12/18 09:09:54 vadim Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef PARSENODES_H
#define PARSENODES_H
#include <nodes/primnodes.h>
/*****************************************************************************
* Query Tree
*****************************************************************************/
/*
* Query -
* all statments are turned into a Query tree (via transformStmt)
* for further processing by the optimizer
* utility statements (i.e. non-optimizable statements)
* have the *utilityStmt field set.
*
* we need the isPortal flag because portal names can be null too; can
* get rid of it if we support CURSOR as a commandType.
*
*/
typedef struct Query
{
NodeTag type;
CmdType commandType; /* select|insert|update|delete|utility */
Node *utilityStmt; /* non-null if this is a non-optimizable
* statement */
int resultRelation; /* target relation (index to rtable) */
char *into; /* portal (cursor) name */
bool isPortal; /* is this a retrieve into portal? */
bool isBinary; /* binary portal? */
bool unionall; /* union without unique sort */
bool hasAggs; /* has aggregates in target list */
bool hasSubLinks; /* has subquery SubLink */
char *uniqueFlag; /* NULL, '*', or Unique attribute name */
List *sortClause; /* a list of SortClause's */
List *rtable; /* list of range table entries */
List *targetList; /* target list (of TargetEntry) */
Node *qual; /* qualifications */
List *groupClause; /* list of columns to specified in GROUP
* BY */
Node *havingQual; /* qualification of each group */
List *unionClause; /* unions are linked under the previous
* query */
Node *limitOffset; /* # of result tuples to skip */
Node *limitCount; /* # of result tuples to return */
/* internal to planner */
List *base_rel_list; /* base relation list */
List *join_rel_list; /* list of relation involved in joins */
} Query;
/*****************************************************************************
* Other Statements (no optimizations required)
*
* Some of them require a little bit of transformation (which is also
* done by transformStmt). The whole structure is then passed on to
* ProcessUtility (by-passing the optimization step) as the utilityStmt
* field in Query.
*****************************************************************************/
/* ----------------------
* Add Column Statement
* ----------------------
*/
typedef struct AddAttrStmt
{
NodeTag type;
char *relname; /* the relation to add attr */
bool inh; /* add recursively to children? */
Node *colDef; /* the attribute definition */
} AddAttrStmt;
/* ----------------------
* Change ACL Statement
* ----------------------
*/
typedef struct ChangeACLStmt
{
NodeTag type;
struct AclItem *aclitem;
unsigned modechg;
List *relNames;
} ChangeACLStmt;
/* ----------------------
* Close Portal Statement
* ----------------------
*/
typedef struct ClosePortalStmt
{
NodeTag type;
char *portalname; /* name of the portal (cursor) */
} ClosePortalStmt;
/* ----------------------
* Copy Statement
* ----------------------
*/
typedef struct CopyStmt
{
NodeTag type;
bool binary; /* is a binary copy? */
char *relname; /* the relation to copy */
bool oids; /* copy oid's? */
int direction; /* TO or FROM */
char *filename; /* if NULL, use stdin/stdout */
char *delimiter; /* delimiter character, \t by default */
} CopyStmt;
/* ----------------------
* Create Table Statement
* ----------------------
*/
typedef struct CreateStmt
{
NodeTag type;
char *relname; /* the relation to create */
List *tableElts; /* column definitions list of Column */
List *inhRelnames; /* relations to inherit from list of Value
* (string) */
List *constraints; /* list of constraints (ConstaintDef) */
} CreateStmt;
typedef enum ConstrType /* type of constaints */
{
CONSTR_NONE, CONSTR_NOTNULL, CONSTR_DEFAULT, CONSTR_CHECK, CONSTR_PRIMARY, CONSTR_UNIQUE
} ConstrType;
typedef struct Constraint
{
NodeTag type;
ConstrType contype;
char *name; /* name */
void *def; /* definition */
void *keys; /* list of primary keys */
} Constraint;
/* ----------------------
* Create/Drop TRIGGER Statements
* ----------------------
*/
typedef struct CreateTrigStmt
{
NodeTag type;
char *trigname; /* TRIGGER' name */
char *relname; /* triggered relation */
char *funcname; /* function to call (or NULL) */
List *args; /* list of (T_String) Values or NULL */
bool before; /* BEFORE/AFTER */
bool row; /* ROW/STATEMENT */
char actions[4]; /* Insert, Update, Delete */
char *lang; /* NULL (which means Clanguage) */
char *text; /* AS 'text' */
List *attr; /* UPDATE OF a, b,... (NI) or NULL */
char *when; /* WHEN 'a > 10 ...' (NI) or NULL */
} CreateTrigStmt;
typedef struct DropTrigStmt
{
NodeTag type;
char *trigname; /* TRIGGER' name */
char *relname; /* triggered relation */
} DropTrigStmt;
/* ----------------------
* Create/Drop PROCEDURAL LANGUAGE Statement
* ----------------------
*/
typedef struct CreatePLangStmt
{
NodeTag type;
char *plname; /* PL name */
char *plhandler; /* PL call handler function */
char *plcompiler; /* lancompiler text */
bool pltrusted; /* PL is trusted */
} CreatePLangStmt;
typedef struct DropPLangStmt
{
NodeTag type;
char *plname; /* PL name */
} DropPLangStmt;
/* ----------------------
* Create/Alter/Drop User Statements
* ----------------------
*/
typedef struct CreateUserStmt
{
NodeTag type;
char *user; /* PostgreSQL user login */
char *password; /* PostgreSQL user password */
bool *createdb; /* Can the user create databases? */
bool *createuser; /* Can this user create users? */
List *groupElts; /* The groups the user is a member of */
char *validUntil; /* The time the login is valid until */
} CreateUserStmt;
typedef CreateUserStmt AlterUserStmt;
typedef struct DropUserStmt
{
NodeTag type;
char *user; /* PostgreSQL user login */
} DropUserStmt;
/* ----------------------
* Create SEQUENCE Statement
* ----------------------
*/
typedef struct CreateSeqStmt
{
NodeTag type;
char *seqname; /* the relation to create */
List *options;
} CreateSeqStmt;
/* ----------------------
* Create Version Statement
* ----------------------
*/
typedef struct VersionStmt
{
NodeTag type;
char *relname; /* the new relation */
int direction; /* FORWARD | BACKWARD */
char *fromRelname; /* relation to create a version */
char *date; /* date of the snapshot */
} VersionStmt;
/* ----------------------
* Create {Operator|Type|Aggregate} Statement
* ----------------------
*/
typedef struct DefineStmt
{
NodeTag type;
int defType; /* OPERATOR|P_TYPE|AGGREGATE */
char *defname;
List *definition; /* a list of DefElem */
} DefineStmt;
/* ----------------------
* Drop Table Statement
* ----------------------
*/
typedef struct DestroyStmt
{
NodeTag type;
List *relNames; /* relations to be dropped */
bool sequence;
} DestroyStmt;
/* ----------------------
* Extend Index Statement
* ----------------------
*/
typedef struct ExtendStmt
{
NodeTag type;
char *idxname; /* name of the index */
Node *whereClause; /* qualifications */
List *rangetable; /* range table, filled in by
* transformStmt() */
} ExtendStmt;
/* ----------------------
* Begin Recipe Statement
* ----------------------
*/
typedef struct RecipeStmt
{
NodeTag type;
char *recipeName; /* name of the recipe */
} RecipeStmt;
/* ----------------------
* Fetch Statement
* ----------------------
*/
typedef struct FetchStmt
{
NodeTag type;
int direction; /* FORWARD or BACKWARD */
int howMany; /* amount to fetch ("ALL" --> 0) */
char *portalname; /* name of portal (cursor) */
bool ismove; /* TRUE if MOVE */
} FetchStmt;
/* ----------------------
* Create Index Statement
* ----------------------
*/
typedef struct IndexStmt
{
NodeTag type;
char *idxname; /* name of the index */
char *relname; /* name of relation to index on */
char *accessMethod; /* name of acess methood (eg. btree) */
List *indexParams; /* a list of IndexElem */
List *withClause; /* a list of ParamString */
Node *whereClause; /* qualifications */
List *rangetable; /* range table, filled in by
* transformStmt() */
bool *lossy; /* is index lossy? */
bool unique; /* is index unique? */
} IndexStmt;
/* ----------------------
* Create Function Statement
* ----------------------
*/
typedef struct ProcedureStmt
{
NodeTag type;
char *funcname; /* name of function to create */
List *defArgs; /* list of definitions a list of strings
* (as Value *) */
Node *returnType; /* the return type (as a string or a
* TypeName (ie.setof) */
List *withClause; /* a list of ParamString */
char *as; /* the SQL statement or filename */
char *language; /* C or SQL */
} ProcedureStmt;
/* ----------------------
* Drop Aggregate Statement
* ----------------------
*/
typedef struct RemoveAggrStmt
{
NodeTag type;
char *aggname; /* aggregate to drop */
char *aggtype; /* for this type */
} RemoveAggrStmt;
/* ----------------------
* Drop Function Statement
* ----------------------
*/
typedef struct RemoveFuncStmt
{
NodeTag type;
char *funcname; /* function to drop */
List *args; /* types of the arguments */
} RemoveFuncStmt;
/* ----------------------
* Drop Operator Statement
* ----------------------
*/
typedef struct RemoveOperStmt
{
NodeTag type;
char *opname; /* operator to drop */
List *args; /* types of the arguments */
} RemoveOperStmt;
/* ----------------------
* Drop {Type|Index|Rule|View} Statement
* ----------------------
*/
typedef struct RemoveStmt
{
NodeTag type;
int removeType; /* P_TYPE|INDEX|RULE|VIEW */
char *name; /* name to drop */
} RemoveStmt;
/* ----------------------
* Alter Table Statement
* ----------------------
*/
typedef struct RenameStmt
{
NodeTag type;
char *relname; /* relation to be altered */
bool inh; /* recursively alter children? */
char *column; /* if NULL, rename the relation name to
* the new name. Otherwise, rename this
* column name. */
char *newname; /* the new name */
} RenameStmt;
/* ----------------------
* Create Rule Statement
* ----------------------
*/
typedef struct RuleStmt
{
NodeTag type;
char *rulename; /* name of the rule */
Node *whereClause; /* qualifications */
CmdType event; /* RETRIEVE */
struct Attr *object; /* object affected */
bool instead; /* is a 'do instead'? */
List *actions; /* the action statements */
} RuleStmt;
/* ----------------------
* Notify Statement
* ----------------------
*/
typedef struct NotifyStmt
{
NodeTag type;
char *relname; /* relation to notify */
} NotifyStmt;
/* ----------------------
* Listen Statement
* ----------------------
*/
typedef struct ListenStmt
{
NodeTag type;
char *relname; /* relation to listen on */
} ListenStmt;
/* ----------------------
* Unlisten Statement
* ----------------------
*/
typedef struct UnlistenStmt
{
NodeTag type;
char *relname; /* relation to unlisten on */
} UnlistenStmt;
/* ----------------------
* {Begin|Abort|End} Transaction Statement
* ----------------------
*/
typedef struct TransactionStmt
{
NodeTag type;
int command; /* BEGIN|END|ABORT */
} TransactionStmt;
/* ----------------------
* Create View Statement
* ----------------------
*/
typedef struct ViewStmt
{
NodeTag type;
char *viewname; /* name of the view */
Query *query; /* the SQL statement */
} ViewStmt;
/* ----------------------
* Load Statement
* ----------------------
*/
typedef struct LoadStmt
{
NodeTag type;
char *filename; /* file to load */
} LoadStmt;
/* ----------------------
* Createdb Statement
* ----------------------
*/
typedef struct CreatedbStmt
{
NodeTag type;
char *dbname; /* database to create */
char *dbpath; /* location of database */
int encoding; /* default encoding (see regex/pg_wchar.h) */
} CreatedbStmt;
/* ----------------------
* Destroydb Statement
* ----------------------
*/
typedef struct DestroydbStmt
{
NodeTag type;
char *dbname; /* database to drop */
} DestroydbStmt;
/* ----------------------
* Cluster Statement (support pbrown's cluster index implementation)
* ----------------------
*/
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;
/*****************************************************************************
* 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 clause */
Node *havingClause; /* having conditional-expression */
List *unionClause; /* union subselect parameters */
bool unionall; /* union without unique sort */
} 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 clause */
Node *havingClause; /* having conditional-expression */
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 unionall; /* union without unique sort */
Node *limitOffset; /* # of result tuples to skip */
Node *limitCount; /* # of result tuples to return */
} 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? */
int16 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)
*/
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? */
char *defval; /* default value of column */
List *constraints; /* 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)
*/
typedef struct ResTarget
{
NodeTag type;
char *name; /* name of the result column */
List *indirection; /* array references */
Node *val; /* the value of the result (A_Expr or
* Attr) (or A_Const) */
} ResTarget;
/*
* ParamString - used in WITH clauses
*/
typedef struct ParamString
{
NodeTag type;
char *name;
char *val;
} ParamString;
/*
* 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;
/*
* JoinUsing - for JOIN USING clause
*/
typedef struct JoinUsing
{
NodeTag type;
int resno; /* target number */
char *range;
char *name; /* name of column to sort on */
} JoinUsing;
/*
* 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;
/****************************************************************************
* 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; /* can be a list too */
} TargetEntry;
/*
* RangeTblEntry -
* used in range tables. 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 targetlist can only refer to range variables listed in the
* from clause but POSTQUEL allows you to refer to tables not specified, in
* which case a range table entry will be generated. We use POSTQUEL
* semantics which is more powerful. However, we need SQL semantics in
* some cases (eg. when expanding a '*')
*/
typedef struct RangeTblEntry
{
NodeTag type;
char *relname; /* real name of the relation */
char *refname; /* the reference name (specified in the
* from clause) */
Oid relid;
bool inh; /* inheritance? */
bool inFromCl; /* comes from From Clause */
bool skipAcl; /* skip ACL check in executor */
} RangeTblEntry;
/*
* SortClause -
* used in the sort clause for retrieves and cursors
*/
typedef struct SortClause
{
NodeTag type;
Resdom *resdom; /* attributes in tlist to be sorted */
Oid opoid; /* sort operators */
} SortClause;
/*
* GroupClause -
* used in the GROUP BY clause
*/
typedef struct GroupClause
{
NodeTag type;
TargetEntry *entry; /* attributes to group on */
Oid grpOpoid; /* the sort operator to use */
} GroupClause;
#endif /* PARSENODES_H */
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