Simple range condition. More...
#include <qExpr.h>
Inheritance diagram for ibis::qContinuousRange:
Public Member Functions | |
| virtual const char * | colName () const |
| Returns the name of the attribute involved. | |
| virtual qContinuousRange * | dup () const |
| Duplicate *this. | |
| virtual bool | empty () const |
| Is the current range empty? | |
| void | foldBoundaries () |
| void | foldUnsignedBoundaries () |
| virtual bool | inRange (double val) const |
| Is val in the specified range? Return true if the incoming value is in the specified range. More... | |
| virtual double | leftBound () const |
| The lower bound of the range. | |
| double & | leftBound () |
| COMPARE | leftOperator () const |
| COMPARE & | leftOperator () |
| bool | operator< (const qContinuousRange &y) const |
| An operator for comparing two query expressions. More... | |
| bool | overlap (double, double) const |
| 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... | |
| qContinuousRange () | |
| Construct an empty range expression. | |
| qContinuousRange (const char *lstr, COMPARE lop, const char *prop, COMPARE rop, const char *rstr) | |
| Construct a range expression from strings. More... | |
| qContinuousRange (const char *col, COMPARE op, uint32_t val) | |
| Construct a range expression with an integer boundary. | |
| qContinuousRange (const qContinuousRange &rhs) | |
| Copy constructor. | |
| qContinuousRange (double lv, COMPARE lop, const char *prop, COMPARE rop, double rv) | |
| Construct a range expression from double-precision boundaries. | |
| qContinuousRange (const char *prop, COMPARE op, double val) | |
| Construct a one-side range expression. | |
| virtual void | restrictRange (double left, double right) |
| Reduce the range to be no more than [left, right]. | |
| virtual double | rightBound () const |
| The upper bound of the range. | |
| double & | rightBound () |
| COMPARE | rightOperator () const |
| COMPARE & | rightOperator () |
 Public Member Functions inherited from ibis::qRange | |
| virtual void | getTableNames (std::set< std::string > &plist) const |
| Identify the data partitions involved in the query expression. More... | |
| 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... | |
Friends | |
| void | ibis::qExpr::simplify (ibis::qExpr *&) |
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::qRange | |
| qRange (TYPE t) | |
| 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
Simple range condition.
It is implemented as a derived class of qExpr. Possible range operator are defined in ibis::qExpr::COMPARE. It is designed to expression equality conditions, one-sided range conditions and two-sided range conditions.
///
/// /* an equality expression */
/// ibis::qExpr *expr = new ibis::qContinuousRange("a", ibis::qExpr::OP_EQ, 5.0);
/// /* a one-sided range expression */
/// ibis::qExpr *expr = new ibis::qContinuousRange("a", ibis::qExpr::OP_GE, 1.3);
/// /* a two-sided range expression */
/// ibis::qExpr *expr = new ibis::qContinuousRange(3.6, ibis::qExpr::OP_LE,
/// "a", ibis::qExpr::OP_LT, 4.7);
///
/// Constructor & Destructor Documentation
| ibis::qContinuousRange::qContinuousRange | ( | const char * | lstr, |
| qExpr::COMPARE | lop, | ||
| const char * | prop, | ||
| qExpr::COMPARE | rop, | ||
| const char * | rstr | ||
| ) |
Construct a range expression from strings.
Construct a qRange directly from a string representation of the constants.
References ibis::util::incrDouble().
Member Function Documentation
|
virtual |
Is val in the specified range? Return true if the incoming value is in the specified range.
Implements ibis::qRange.
Referenced by ibis::bord::column::evaluateRange(), ibis::bin::mergeValues(), and ibis::qExpr::simplify().
|
inline |
An operator for comparing two query expressions.
The comparison is based on the name first, then the left bound and then the right bound.
References colName().
|
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 |
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.
The documentation for this class was generated from the following files:
- qExpr.h
- qExpr.cpp
