|
Class Summary |
| AggregateRel |
AggregateRel is a relational operator which eliminates
duplicates and computes totals. |
| AggregateRel.Call |
|
| CorrelatorRel |
A CorrelatorRel behaves like a kind of JoinRel, but
works by setting variables in its environment and restarting its
right-hand input. |
| DistinctRel |
DistinctRel is a SaffronRel which eliminates
duplicates from its input. |
| FilterRel |
A FilterRel is a relational expression which iterates over its
input, and returns elements for which condition evaluates to
true. |
| IntersectRel |
todo: |
| JoinRel |
A JoinRel represents two relational expressions joined according to some
condition. |
| JoinRel.JoinType |
Enumeration of join types. |
| MinusRel |
todo: |
| OneRowRel |
OneRowRel always returns one row, zero columns. |
| ProjectRel |
ProjectRel is a relational expression which computes a set of
'select expressions' from its input relational expression. |
| ProjectRelBase |
ProjectRelBase is an abstract base class for SaffronRels which
perform projection. |
| RelFieldCollation |
RelFieldCollation defines the ordering for one field of a SaffronRel whose
output is to be sorted. |
| RelVisitor |
A RelVisitor is a Visitor role in the Visitor pattern and
visits SaffronRel objects as the role of Element. |
| RemoveDistinctRule |
Rule to remove a DistinctRel if the underlying relational
expression is already distinct. |
| RemoveTrivialProjectRule |
Rule which, given a ProjectRel node which merely returns its input,
converts the node into its child. |
| SaffronRel |
A SaffronRel is a relational expression. |
| SingleRel |
A SingleRel is a base class single-input relational
expressions. |
| SortRel |
Relational expression which imposes a
particular sort order on its input without otherwise changing its content. |
| SwapJoinRule |
SwapJoinRule permutes the inputs to a join. |
| SwapJoinRule.VariableReplacer |
Walks over an expression, replacing references to fields of the left and
right inputs. |
| TableAccessRel |
A TableAccessRel reads all the rows from a SaffronTable. |
| TableModificationRel |
TableModificationRel is like TableAccessRel, but represents a request to
modify a table rather than read from it. |
| TableModificationRel.Operation |
Enumeration of supported modification operations. |
| UnionRel |
UnionRel returns the union of the rows of its inputs,
optionally eliminating duplicates. |
| UnionToDistinctRule |
UnionToDistinctRule translates a distinct UnionRel
(all = false) into a DistinctRel on top
of a non-distinct UnionRel (all = true). |
Defines Saffron relational expressions.