Uses of Class
relop.Iterator

Packages that use Iterator

relop

Uses of Iterator in relop

Subclasses of Iterator in relop

class	FileScan Wrapper for heap file scan, the most basic access method.
class	HashJoin Implements the hash-based join algorithm described in section 14.4.3 of the textbook (3rd edition; see pages 463 to 464).
class	IndexScan Wrapper for bucket scan, an index access method.
class	KeyScan Wrapper for hash scan, an index access method.
class	Projection The projection operator extracts columns from a relation; unlike in relational algebra, this operator does NOT eliminate duplicate tuples.
class	Selection The selection operator specifies which tuples to retain under a condition; in Minibase, this condition is simply a set of independent predicates logically connected by OR operators.
class	SimpleJoin The simplest of all join algorithms: nested loops (see textbook, 3rd edition, section 14.4.1, page 454).

Constructors in relop with parameters of type Iterator

HashJoin(Iterator left, Iterator right, java.lang.Integer lcol, java.lang.Integer rcol)
Constructs a hash join, given the left and right iterators and which columns to match (relative to their individual schemas).

Projection(Iterator iter, java.lang.Integer... fields)
Constructs a projection, given the underlying iterator and field numbers.

Selection(Iterator iter, Predicate... preds)
Constructs a selection, given the underlying iterator and predicates.

SimpleJoin(Iterator left, Iterator right, Predicate... preds)
Constructs a join, given the left and right iterators and join predicates (relative to the combined schema).