class XxxAggrExpression : public XxxFuncExpression

An aggregate expression is a slight variant of a FuncExpression

Inheritance:

Inherited from XxxFuncExpression:

Public Classes

class FuncPlan: public XxxValueExprPlan

Public Methods

virtual XxxValueExprList* DirectSubexpressions()

XxxBool IsCountAggr()

Used in gbyplanop

virtual XxxErrCode Evaluate(const XxxRecord* Rec[], const XxxRecordSchema* Schema[], XxxADTValue *Result, const XxxValueEnv* Env = NULL)

Evaluate() is not meaningful for an aggregate expression.

virtual XxxErrCode Drop(const XxxRecord* Rec[], const XxxRecordSchema* Schema[], XxxAggrOpHandle *Handle, const XxxValueEnv* Env = NULL)

/ This drops the input from the AggrOpHandle.

XxxBool IsAggr()

virtual XxxBool Match(const XxxExpression* RuleExpr, XxxBindingEnv *BindEnv)

virtual XxxBool ReferencesAggregate()

virtual XxxErrCode Replace(const XxxExpression *Target, const XxxExpression *Replacement)

virtual XxxErrCode Replace(const XxxUnknownValue *Target, const XxxExpression *Replacement)

virtual XxxExpression* Replicate()

virtual XxxErrCode UpdateUnknowns(int ChildNumber, int OldAttrIndex, int NewAttrIndex, XxxBool &Appears)

virtual XxxValueExprList* ValExprsReferenced()

Inherited from XxxValueExpression:

Public Classes

enum ValExprTypeEnum

Public Fields

char* ExprName

Public Methods

virtual int Arity()

inline XxxValueExpression* ChildExpr(int i)

virtual XxxADTMetaInfo* GenerateCatInfo()

virtual XxxErrCode GetDependencies(XxxBitMap& Dependendency, int CorrelationHt)

virtual XxxBool IsConstant()

virtual XxxErrCode Optimize(XxxValueExprPlan*& ExecPlan)

virtual void Print(ostream&)

virtual XxxErrCode ResolveVars(const XxxArgEnv* Env)

virtual XxxErrCode ResolveVars(const XxxRecordSchema *Schema)

virtual XxxErrCode ResolveVars(XxxQueryNode* Node, char Source)

XxxErrCode SetChild(int Index, XxxValueExpression* NewExp)

virtual XxxErrCode TypeCheck()

Public

typedef enum ValExprTypeEnum ValExprType

enum ValExprTypeEnum

Protected Fields

int arity

XxxValueExpression** childExpr

alphabetic index hierarchy of classes

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