ibis::qLike Class Reference

Representing the operator 'LIKE'. More...

#include <qExpr.h>

Inheritance diagram for ibis::qLike:

Public Member Functions
const char *	colName () const
	Name of the column to be searched.
virtual qLike *	dup () const
	!< Reorder the expressions tree. More...
virtual void	getTableNames (std::set< std::string > &plist) const
	Identify the data partitions involved in the query expression. More...
const char *	pattern () const
	The string form of the pattern.
virtual void	print (std::ostream &) const
	Print out the node in the string form. More...
virtual void	printFull (std::ostream &out) const
	Print out the full expression. More...
	qLike ()
	Default constructor.
	qLike (const char *ls, const char *rs)
	Constructor. More...
virtual	~qLike ()
	Destructor.
Public Member Functions inherited from ibis::qExpr
bool	directEval () const
	Can the expression be directly evaluated?
void	extractDeprecatedJoins (std::vector< const deprecatedJoin * > &) const
	Extract conjunctive terms of the deprecated joins.
qRange *	findRange (const char *vname)
	Find the first range condition involving the named variable.
void	getConjunctiveTerms (termTableList &) const
	Extract the top-level conjunctive terms. More...
qExpr *&	getLeft ()
	Return a pointer to the left child. More...
const qExpr *	getLeft () const
	Return a const pointer to the left child.
qExpr *&	getRight ()
	Return a pointer to the right child. More...
const qExpr *	getRight () const
	Return a const pointer to the right child.
TYPE	getType () const
	Return the node type.
virtual bool	isConstant () const
	Is this expression a constant? A constant remains the same not matter which row it is applied to. More...
virtual bool	isSimple () const
	Is the expression simple? A simple expression contains only range conditions connected with logical operators. More...
bool	isTerminal () const
	Is this expression a terminal node of an expression tree?
virtual uint32_t	nItems () const
	Count the number of items in the query expression.
qExpr &	operator= (const qExpr &rhs)
	Assignment operator.
	qExpr ()
	Default constructor. It generates a node of undefined type.
	qExpr (TYPE op)
	Construct a node of specified type. Not for implicit type conversion.
	qExpr (TYPE op, qExpr *qe1, qExpr *qe2)
	Construct a full specified node. More...
	qExpr (const qExpr &qe)
	Copy Constructor. Deep copy.
double	reorder (const weight &)
	After reordering, the lightest weight is one the left side of a group of commutable operators. More...
int	separateSimple (ibis::qExpr *&simple, ibis::qExpr *&tail) const
	Separate an expression tree into two connected with an AND operator. More...
void	setLeft (qExpr *expr)
	Change the left child. More...
void	setRight (qExpr *expr)
	Change the right child. More...
void	swap (qExpr &rhs)
	Swap the content. No exception expected.
virtual	~qExpr ()
	Destructor. More...

Additional Inherited Members
Public Types inherited from ibis::qExpr
enum	COMPARE {   OP_UNDEFINED, OP_LT, OP_GT, OP_LE,   OP_GE, OP_EQ }
	Comparison operator supported in RANGE.
typedef std::vector< TTN >	termTableList
enum	TYPE {   LOGICAL_UNDEFINED, LOGICAL_NOT, LOGICAL_AND, LOGICAL_OR,   LOGICAL_XOR, LOGICAL_MINUS, RANGE, DRANGE,   STRING, ANYSTRING, KEYWORD, ALLWORDS,   COMPRANGE, MATHTERM, DEPRECATEDJOIN, TOPK,   EXISTS, ANYANY, LIKE, INTHOD,   UINTHOD }
	Definition of node types. More...
Static Public Member Functions inherited from ibis::qExpr
static std::string	extractTableName (const char *)
	Extract the data partition name from the column name cn. More...
static void	simplify (ibis::qExpr *&)
	Attempt to simplify the query expressions. More...
static void	splitColumnName (const char *, std::string &, std::string &)
	Split the incoming name into data partition name and column name. More...
Protected Member Functions inherited from ibis::qExpr
void	adjust ()
	Adjust the tree to favor the sequential evaluation order. More...
Protected Attributes inherited from ibis::qExpr
qExpr *	left
	The left child.
qExpr *	right
	The right child.
TYPE	type
	The type of node. More...

Detailed Description

Representing the operator 'LIKE'.

Constructor & Destructor Documentation

ibis::qLike::qLike	(	const char *	ls,
		const char *	rs
	)

Constructor.

For convenience of inputting patterns, this function allows the back slash to be used as escape characters for the second argument, and attempts to remove them before passing the pattern expression to later operations.

Member Function Documentation

virtual qLike* ibis::qLike::dup ( ) const

inlinevirtual

!< Reorder the expressions tree.

Duplicate this query expression. Return the pointer to the new object.

Reimplemented from ibis::qExpr.

References qLike().

void ibis::qLike::getTableNames ( std::set< std::string > &  plist ) const

virtual

Identify the data partitions involved in the query expression.

Return the list of data partition names in a set.

It records a '*' for the variables without explicit partition names.

Reimplemented from ibis::qExpr.

References ibis::qExpr::extractTableName().

void ibis::qLike::print ( std::ostream &  out ) const

virtual

Print out the node in the string form.

The short-form of the print function.

It only prints information about the current node of the query expression tree.

Reimplemented from ibis::qExpr.

virtual void ibis::qLike::printFull ( std::ostream &  out ) const

inlinevirtual

Print out the full expression.

The long form of the print function.

It recursively prints out the whole query expression tree, which can be quite long.

Reimplemented from ibis::qExpr.

References ibis::qExpr::print().

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The documentation for this class was generated from the following files:

• qExpr.h
• qExpr.cpp