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openGauss-server/src/common/backend/nodes/makefuncs.cpp

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/* -------------------------------------------------------------------------
*
* makefuncs.cpp
* creator functions for primitive nodes. The functions here are for
* the most frequently created nodes.
*
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/common/backend/nodes/makefuncs.cpp
*
* -------------------------------------------------------------------------
*/
#include "postgres.h"
#include "knl/knl_variable.h"
#include "catalog/pg_class.h"
#include "catalog/pg_type.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "utils/lsyscache.h"
extern TypeName* SystemTypeName(char* name);
/*
* makeA_Expr -
* makes an A_Expr node
*/
A_Expr* makeA_Expr(A_Expr_Kind kind, List* name, Node* lexpr, Node* rexpr, int location)
{
A_Expr* a = makeNode(A_Expr);
a->kind = kind;
a->name = name;
a->lexpr = lexpr;
a->rexpr = rexpr;
a->location = location;
return a;
}
/*
* makeSimpleA_Expr -
* As above, given a simple (unqualified) operator name
*/
A_Expr* makeSimpleA_Expr(A_Expr_Kind kind, char* name, Node* lexpr, Node* rexpr, int location)
{
A_Expr* a = makeNode(A_Expr);
a->kind = kind;
a->name = list_make1(makeString((char*)name));
a->lexpr = lexpr;
a->rexpr = rexpr;
a->location = location;
return a;
}
/*
* makeVar -
* creates a Var node
*/
Var* makeVar(Index varno, AttrNumber varattno, Oid vartype, int32 vartypmod, Oid varcollid, Index varlevelsup)
{
Var* var = makeNode(Var);
var->varno = varno;
var->varattno = varattno;
var->vartype = vartype;
var->vartypmod = vartypmod;
var->varcollid = varcollid;
var->varlevelsup = varlevelsup;
/*
* Since few if any routines ever create Var nodes with varnoold/varoattno
* different from varno/varattno, we don't provide separate arguments for
* them, but just initialize them to the given varno/varattno. This
* reduces code clutter and chance of error for most callers.
*/
var->varnoold = varno;
var->varoattno = varattno;
/* Likewise, we just set location to "unknown" here */
var->location = -1;
return var;
}
/*
* makeVarFromTargetEntry -
* convenience function to create a same-level Var node from a
* TargetEntry
*/
Var* makeVarFromTargetEntry(Index varno, TargetEntry* tle)
{
return makeVar(varno,
tle->resno,
exprType((Node*)tle->expr),
exprTypmod((Node*)tle->expr),
exprCollation((Node*)tle->expr),
0);
}
/*
* makeWholeRowVar -
* creates a Var node representing a whole row of the specified RTE
*
* A whole-row reference is a Var with varno set to the correct range
* table entry, and varattno == 0 to signal that it references the whole
* tuple. (Use of zero here is unclean, since it could easily be confused
* with error cases, but it's not worth changing now.) The vartype indicates
* a rowtype; either a named composite type, or RECORD. This function
* encapsulates the logic for determining the correct rowtype OID to use.
*
* If allowScalar is true, then for the case where the RTE is a function
* returning a non-composite result type, we produce a normal Var referencing
* the function's result directly, instead of the single-column composite
* value that the whole-row notation might otherwise suggest.
*/
Var* makeWholeRowVar(RangeTblEntry* rte, Index varno, Index varlevelsup, bool allowScalar)
{
Var* result = NULL;
Oid toid;
switch (rte->rtekind) {
case RTE_RELATION:
/* relation: the rowtype is a named composite type */
toid = get_rel_type_id(rte->relid);
if (!OidIsValid(toid)) {
ereport(ERROR,
(errmodule(MOD_OPT),
errcode(ERRCODE_CACHE_LOOKUP_FAILED),
errmsg("could not find type OID for relation %u", rte->relid)));
}
result = makeVar(varno, InvalidAttrNumber, toid, -1, InvalidOid, varlevelsup);
break;
case RTE_FUNCTION:
toid = exprType(rte->funcexpr);
if (type_is_rowtype(toid)) {
/* func returns composite; same as relation case */
result = makeVar(varno, InvalidAttrNumber, toid, -1, InvalidOid, varlevelsup);
} else if (allowScalar) {
/* func returns scalar; just return its output as-is */
result = makeVar(varno, 1, toid, -1, exprCollation(rte->funcexpr), varlevelsup);
} else {
/* func returns scalar, but we want a composite result */
result = makeVar(varno, InvalidAttrNumber, RECORDOID, -1, InvalidOid, varlevelsup);
}
break;
#ifdef PGXC
case RTE_REMOTE_DUMMY:
result = NULL;
ereport(ERROR, (errmodule(MOD_OPT), errcode(ERRCODE_UNDEFINED_OBJECT), errmsg("Invalid RTE found")));
break;
#endif /* PGXC */
default:
/*
* RTE is a join, subselect, or VALUES. We represent this as a
* whole-row Var of RECORD type. (Note that in most cases the Var
* will be expanded to a RowExpr during planning, but that is not
* our concern here.)
*/
result = makeVar(varno, InvalidAttrNumber, RECORDOID, -1, InvalidOid, varlevelsup);
break;
}
return result;
}
/*
* makeTargetEntry -
* creates a TargetEntry node
*/
TargetEntry* makeTargetEntry(Expr* expr, AttrNumber resno, char* resname, bool resjunk)
{
TargetEntry* tle = makeNode(TargetEntry);
tle->expr = expr;
tle->resno = resno;
tle->resname = resname;
/*
* We always set these fields to 0. If the caller wants to change them he
* must do so explicitly. Few callers do that, so omitting these
* arguments reduces the chance of error.
*/
tle->ressortgroupref = 0;
tle->resorigtbl = InvalidOid;
tle->resorigcol = 0;
tle->resjunk = resjunk;
return tle;
}
/*
* flatCopyTargetEntry -
* duplicate a TargetEntry, but don't copy substructure
*
* This is commonly used when we just want to modify the resno or substitute
* a new expression.
*/
TargetEntry* flatCopyTargetEntry(TargetEntry* src_tle)
{
TargetEntry* tle = makeNode(TargetEntry);
Assert(IsA(src_tle, TargetEntry));
errno_t rc = memcpy_s(tle, sizeof(TargetEntry), src_tle, sizeof(TargetEntry));
securec_check(rc, "\0", "\0");
return tle;
}
/*
* makeFromExpr -
* creates a FromExpr node
*/
FromExpr* makeFromExpr(List* fromlist, Node* quals)
{
FromExpr* f = makeNode(FromExpr);
f->fromlist = fromlist;
f->quals = quals;
return f;
}
/*
* makeColumnRef -
* creates a ColumnRef node
*/
ColumnRef* makeColumnRef(char* relname, char* colname, int location)
{
ColumnRef* c = makeNode(ColumnRef);
c->fields = list_make2((Node*)makeString(relname), (Node*)makeString(colname));
c->location = location;
return c;
}
/*
* makeConst -
* creates a Const node
*/
Const* makeConst(Oid consttype, int32 consttypmod, Oid constcollid, int constlen, Datum constvalue, bool constisnull,
bool constbyval, Cursor_Data* cur)
{
Const* cnst = makeNode(Const);
cnst->consttype = consttype;
cnst->consttypmod = consttypmod;
cnst->constcollid = constcollid;
cnst->constlen = constlen;
cnst->constvalue = constvalue;
cnst->constisnull = constisnull;
cnst->constbyval = constbyval;
cnst->location = -1; /* "unknown" */
cnst->ismaxvalue = false;
if (cur != NULL) {
CopyCursorInfoData(&cnst->cursor_data, cur);
} else {
cnst->cursor_data.cur_dno = -1;
}
return cnst;
}
/*
* makeNullTest -
* creates a Null Test expr like "expr is (NOT) NULL"
*/
NullTest* makeNullTest(NullTestType type, Expr* expr)
{
NullTest* n = makeNode(NullTest);
n->nulltesttype = type;
n->arg = expr;
return n;
}
Node* makeNullAConst(int location)
{
A_Const* n = makeNode(A_Const);
n->val.type = T_Null;
n->location = location;
return (Node*)n;
}
/*
* makeNullConst -
* creates a Const node representing a NULL of the specified type/typmod
*
* This is a convenience routine that just saves a lookup of the type's
* storage properties.
*/
Const* makeNullConst(Oid consttype, int32 consttypmod, Oid constcollid)
{
int16 typLen;
bool typByVal = false;
get_typlenbyval(consttype, &typLen, &typByVal);
return makeConst(consttype, consttypmod, constcollid, (int)typLen, (Datum)0, true, typByVal);
}
/*
* makeBoolConst -
* creates a Const node representing a boolean value (can be NULL too)
*/
Node* makeBoolConst(bool value, bool isnull)
{
/* note that pg_type.h hardwires size of bool as 1 ... duplicate it */
return (Node*)makeConst(BOOLOID, -1, InvalidOid, 1, BoolGetDatum(value), isnull, true);
}
/*
* @@GaussDB@@
* Target : data partition
* Brief : creates a Const node representing a max value
* Description :
* Notes :
*/
Const* makeMaxConst(Oid consttype, int32 consttypmod, Oid constcollid)
{
Const* cnst = NULL;
int16 typLen;
bool typByVal = false;
if (InvalidOid == consttype) {
cnst = makeConst(InvalidOid, -1, InvalidOid, 0, (Datum)0, false, true);
} else {
get_typlenbyval(consttype, &typLen, &typByVal);
cnst = makeConst(consttype, consttypmod, constcollid, (int)typLen, (Datum)0, false, true);
}
cnst->ismaxvalue = true;
return cnst;
}
/*
* makeBoolExpr -
* creates a BoolExpr node
*/
Expr* makeBoolExpr(BoolExprType boolop, List* args, int location)
{
BoolExpr* b = makeNode(BoolExpr);
b->boolop = boolop;
b->args = args;
b->location = location;
return (Expr*)b;
}
/*
* makeBoolExpr -
* creates a BoolExpr tree node.
*/
Expr* makeBoolExprTreeNode(BoolExprType boolop, List* args)
{
Node* node = NULL;
ListCell* lc = NULL;
foreach (lc, args) {
BoolExpr* b = NULL;
if (node == NULL) {
node = (Node*)lfirst(lc);
continue;
}
b = makeNode(BoolExpr);
b->boolop = boolop;
b->args = list_make2(node, lfirst(lc));
b->location = 0;
node = (Node*)b;
}
return (Expr*)node;
}
/*
* makeAlias -
* creates an Alias node
*
* NOTE: the given name is copied, but the colnames list (if any) isn't.
*/
Alias* makeAlias(const char* aliasname, List* colnames)
{
Alias* a = makeNode(Alias);
a->aliasname = pstrdup(aliasname);
a->colnames = colnames;
return a;
}
/*
* makeRelabelType -
* creates a RelabelType node
*/
RelabelType* makeRelabelType(Expr* arg, Oid rtype, int32 rtypmod, Oid rcollid, CoercionForm rformat)
{
RelabelType* r = makeNode(RelabelType);
r->arg = arg;
r->resulttype = rtype;
r->resulttypmod = rtypmod;
r->resultcollid = rcollid;
r->relabelformat = rformat;
r->location = -1;
return r;
}
/*
* makeRangeVar -
* creates a RangeVar node (rather oversimplified case)
*/
RangeVar* makeRangeVar(char* schemaname, char* relname, int location)
{
RangeVar* r = makeNode(RangeVar);
r->catalogname = NULL;
r->schemaname = schemaname;
r->relname = relname;
r->partitionname = NULL;
r->inhOpt = INH_DEFAULT;
r->relpersistence = RELPERSISTENCE_PERMANENT;
r->alias = NULL;
r->location = location;
r->ispartition = false;
r->partitionKeyValuesList = NIL;
r->isbucket = false;
r->buckets = NIL;
return r;
}
/*
* makeTypeName -
* build a TypeName node for an unqualified name.
*
* typmod is defaulted, but can be changed later by caller.
*/
TypeName* makeTypeName(char* typnam)
{
return makeTypeNameFromNameList(list_make1(makeString(typnam)));
}
/*
* makeTypeNameFromNameList -
* build a TypeName node for a String list representing a qualified name.
*
* typmod is defaulted, but can be changed later by caller.
*/
TypeName* makeTypeNameFromNameList(List* names)
{
TypeName* n = makeNode(TypeName);
n->names = names;
n->typmods = NIL;
n->typemod = -1;
n->location = -1;
return n;
}
/*
* makeTypeNameFromOid -
* build a TypeName node to represent a type already known by OID/typmod.
*/
TypeName* makeTypeNameFromOid(Oid typeOid, int32 typmod)
{
TypeName* n = makeNode(TypeName);
n->typeOid = typeOid;
n->typemod = typmod;
n->location = -1;
return n;
}
/*
* makeFuncExpr -
* build an expression tree representing a function call.
*
* The argument expressions must have been transformed already.
*/
FuncExpr* makeFuncExpr(Oid funcid, Oid rettype, List* args, Oid funccollid, Oid inputcollid, CoercionForm fformat)
{
FuncExpr* funcexpr = NULL;
funcexpr = makeNode(FuncExpr);
funcexpr->funcid = funcid;
funcexpr->funcresulttype = rettype;
funcexpr->funcretset = false; /* only allowed case here */
funcexpr->funcformat = fformat;
funcexpr->funccollid = funccollid;
funcexpr->inputcollid = inputcollid;
funcexpr->args = args;
funcexpr->location = -1;
return funcexpr;
}
/*
* makeDefElem -
* build a DefElem node
*
* This is sufficient for the "typical" case with an unqualified option name
* and no special action.
*/
DefElem* makeDefElem(char* name, Node* arg)
{
DefElem* res = makeNode(DefElem);
res->defnamespace = NULL;
res->defname = name;
res->arg = arg;
res->defaction = DEFELEM_UNSPEC;
return res;
}
/*
* makeDefElemExtended -
* build a DefElem node with all fields available to be specified
*/
DefElem* makeDefElemExtended(char* nameSpace, char* name, Node* arg, DefElemAction defaction)
{
DefElem* res = makeNode(DefElem);
res->defnamespace = nameSpace;
res->defname = name;
res->arg = arg;
res->defaction = defaction;
return res;
}
/*
* makeHashFilter -
* creates a Hash Filter expr for replicated node to filter tuple using hash
*/
HashFilter* makeHashFilter(List* arg, List* typeOidlist, List* nodelist)
{
HashFilter* n = makeNode(HashFilter);
n->arg = arg;
n->typeOids = typeOidlist;
n->nodeList = nodelist;
return n;
}
/*
* makeGroupingSet
*
*/
GroupingSet* makeGroupingSet(GroupingSetKind kind, List* content, int location)
{
GroupingSet* n = makeNode(GroupingSet);
n->kind = kind;
n->content = content;
n->location = location;
return n;
}
/*
* makeTidConst -
* creates a Const node representing a Tid value
*/
Node* makeTidConst(ItemPointer item)
{
return (Node*)makeConst(TIDOID, -1, InvalidOid, TID_TYPE_LEN, PointerGetDatum(item), false, false);
}
/*
* makeFuncCall -
* creates a FuncCall node
*/
FuncCall* makeFuncCall(List* funcname, List* args, int location)
{
FuncCall* funcCall = NULL;
funcCall = (FuncCall*)makeNode(FuncCall);
funcCall->funcname = funcname;
funcCall->colname = NULL;
funcCall->args = args;
funcCall->agg_star = FALSE;
funcCall->func_variadic = FALSE;
funcCall->agg_distinct = FALSE;
funcCall->agg_order = NIL;
funcCall->over = NULL;
funcCall->location = location;
return funcCall;
}
/*
* Param -
* creates a Param node
*/
Param* makeParam(ParamKind paramkind, int paramid, Oid paramtype, int32 paramtypmod, Oid paramcollid, int location)
{
Param* argp = NULL;
argp = makeNode(Param);
argp->paramkind = paramkind;
argp->paramid = paramid;
argp->paramtype = paramtype;
argp->paramtypmod = paramtypmod;
argp->paramcollid = paramcollid;
argp->location = location;
return argp;
}
/*
* makeColumnDef -
* build a ColumnDef node to represent a simple column definition.
*
* Type and collation are specified by OID.
* Other properties are all basic to start with.
*/
ColumnDef* makeColumnDef(const char* colname, Oid typeOid, int32 typmod, Oid collOid)
{
ColumnDef* n = makeNode(ColumnDef);
n->colname = pstrdup(colname);
n->typname = makeTypeNameFromOid(typeOid, typmod);
n->inhcount = 0;
n->is_local = true;
n->is_not_null = false;
n->is_from_type = false;
n->storage = 0;
n->raw_default = NULL;
n->cooked_default = NULL;
n->collClause = NULL;
n->collOid = collOid;
n->constraints = NIL;
n->fdwoptions = NIL;
return n;
}
/* makeIndexInfo
* create an IndexInfo node
*/
IndexInfo* makeIndexInfo(int numattrs, List* expressions, List* predicates, bool unique, bool isready, bool concurrent)
{
IndexInfo* n = makeNode(IndexInfo);
n->ii_NumIndexAttrs = numattrs;
n->ii_Unique = unique;
n->ii_ReadyForInserts = isready;
n->ii_Concurrent = concurrent;
/* expressions */
n->ii_Expressions = expressions;
n->ii_ExpressionsState = NIL;
/* predicates */
n->ii_Predicate = predicates;
n->ii_PredicateState = NULL;
/* exclusion constraints */
n->ii_ExclusionOps = NULL;
n->ii_ExclusionProcs = NULL;
n->ii_ExclusionStrats = NULL;
/* initialize index-build state to default */
n->ii_BrokenHotChain = false;
n->ii_PgClassAttrId = 0;
return n;
}
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