|
Class Summary |
| AggInternalTranslator |
Converts expressions to consist only of constants, references to group
by expressions (variables called "$group0", etc.), and calls to
aggregate functions (variables called "$agg0", etc.). |
| Aggregate |
Aggregate is a relational operator which eliminates duplicates
and computes totals. |
| Aggregate.Call |
|
| Aggregate.ConvertToJavaRule |
|
| AggUnpickler |
Converts references to group items and aggregates (created by AggInternalTranslator) into more conventional field accesses. |
| Correlator |
A Correlator behaves like a kind of Join, but works by
setting variables in its environment and restarting its right-hand input. |
| DeferredLookup |
Contains the information necessary to repeat a call to
QueryInfo.lookup(int,Rel[],boolean,String). |
| Distinct |
Distinct is a Rel which eliminates duplicates from its
input. |
| Distinct.ConvertDistinctToJavaRule |
|
| DistinctToExistsRule |
Rule to translate a JavaDistinct into a JavaExists, provided that the select list contains zero
columns. |
| ExpressionReader |
An ExpressionReader is a relational expression node which
evaluates an expression and returns the results as a relation. |
| ExtenderAggregation |
ExtenderAggregation is an aggregation which works by
instantiating a user-defined aggregation (AggregationExtender), as opposed to generating custom code. |
| Filter |
A Filter is a relational expression which iterates over its
input, and returns elements for which condition evaluates to
true. |
| Filter.ConvertToJavaRule |
|
| Filter.ConvertToPlanRule |
|
| InternalTranslator |
Converts an expression into one which references only internal
variables. |
| Intersect |
todo: |
| Join |
A Join represents two relational expressions joined according to some
condition. |
| Join.ConvertToJavaRule |
|
| Join.ConvertToPlanRule |
|
| Join.JoinType |
Values are as JoinExpression.getJoinTypeCode(java.lang.String). |
| Minus |
todo: |
| OneRow |
OneRow always returns one row, zero columns. |
| OneRow.OneRowToJavaRule |
Converts a OneRow to
Java calling convention. |
| Project |
Project is a relational expression which computes a set of
'select expressions' from its input relational expression. |
| Project.ConvertToJavaRule |
Converts a Project to
Java calling convention. |
| Project.ConvertToPlanRule |
Converts a Project to
plan calling convention. |
| QueryInfo |
A QueryInfo holds all the information about a QueryExpression while it is being translated into a collection of
Rels. |
| Rel |
A Rel is a relational expression. |
| Rel.PlanImplementor |
|
| RemoveDistinctRule |
Rule to remove a Distinct if the underlying relational expression is
already distinct. |
| RemoveTrivialProjectRule |
Rule which, given a Project node which merely returns its input,
converts the node into its child. |
| SaffronQueryExpander |
SaffronQueryExpander passes over a parse tree, and converts
relational expressions into regular Java constructs. |
| SingleRel |
A SingleRel is a base class single-input relational
expressions. |
| SubqueryFinder |
|
| SwapJoinRule |
SwapJoinRule permutes the inputs to a join. |
| TableAccess |
A TableAccess reads all the rows from a Table. |
| TableAccess.ConvertToJavaRule |
Rule to converts a TableAccess to
Java calling convention. |
| TypeFactoryImpl |
Implementation of TypeFactory. |
| TypeFactoryImpl.FieldImpl |
Simple implementation of Field |
| Union |
Union returns the union of the rows of its inputs, optionally
eliminating duplicates. |
| Union.ConvertToIteratorRule |
Rule to converts a Union to
iterator calling convention. |
| Union.ConvertToJavaRule |
Rule to converts a Union to
Java calling convention. |
| UnionToDistinctRule |
UnionToDistinctRule translates a distinct Union
(all = false) into a Distinct on top
of a non-distinct Union (all = true). |
Defines Saffron relational expressions.