Package com.mckoi.database
Interface QueryPlanNode
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- All Superinterfaces:
java.lang.Cloneable
,java.io.Serializable
- All Known Implementing Classes:
QueryPlan.BranchQueryPlanNode
,QueryPlan.CachePointNode
,QueryPlan.CompositeNode
,QueryPlan.ConstantSelectNode
,QueryPlan.CreateFunctionsNode
,QueryPlan.DistinctNode
,QueryPlan.EquiJoinNode
,QueryPlan.ExhaustiveSelectNode
,QueryPlan.FetchTableNode
,QueryPlan.FetchViewNode
,QueryPlan.FunctionalSelectNode
,QueryPlan.GroupNode
,QueryPlan.JoinNode
,QueryPlan.LeftOuterJoinNode
,QueryPlan.LogicalUnionNode
,QueryPlan.MarkerNode
,QueryPlan.MultiColumnEquiSelectNode
,QueryPlan.NaturalJoinNode
,QueryPlan.NonCorrelatedAnyAllNode
,QueryPlan.RangeSelectNode
,QueryPlan.SimplePatternSelectNode
,QueryPlan.SimpleSelectNode
,QueryPlan.SingleQueryPlanNode
,QueryPlan.SingleRowTableNode
,QueryPlan.SortNode
,QueryPlan.SubsetNode
public interface QueryPlanNode extends java.io.Serializable, java.lang.Cloneable
A node element of a query plan tree. A plan of a query is represented as a tree structure of such nodes. The design allows for plan nodes to be easily reorganised for the construction of better plans.- Author:
- Tobias Downer
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description java.lang.Object
clone()
Deep clones this query plan.void
debugString(int indent, java.lang.StringBuffer buf)
Writes a textural representation of the node to the StringBuffer at the given indent level.java.util.ArrayList
discoverCorrelatedVariables(int level, java.util.ArrayList list)
Discovers all the correlated variables in the plan (and plan children) that reference a particular layer.java.util.ArrayList
discoverTableNames(java.util.ArrayList list)
Discovers a list of TableName that represent the sources that this query requires to complete itself.Table
evaluate(QueryContext context)
Evaluates the node and returns the result as a Table.
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Method Detail
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evaluate
Table evaluate(QueryContext context)
Evaluates the node and returns the result as a Table. The VariableResolver resolves any outer variables
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discoverTableNames
java.util.ArrayList discoverTableNames(java.util.ArrayList list)
Discovers a list of TableName that represent the sources that this query requires to complete itself. For example, if this is a query plan of two joined table, the fully resolved names of both tables are returned.The resultant list will not contain the same table name more than once. The resultant list contains TableName objects.
NOTE, if a table is aliased, the unaliased name is returned.
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discoverCorrelatedVariables
java.util.ArrayList discoverCorrelatedVariables(int level, java.util.ArrayList list)
Discovers all the correlated variables in the plan (and plan children) that reference a particular layer. For example, if we wanted to find all the CorrelatedVariable objects that reference the current layer, we would typically call 'discoverCorrelatedVariables(0, new ArrayList())'
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clone
java.lang.Object clone() throws java.lang.CloneNotSupportedException
Deep clones this query plan.- Throws:
java.lang.CloneNotSupportedException
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debugString
void debugString(int indent, java.lang.StringBuffer buf)
Writes a textural representation of the node to the StringBuffer at the given indent level.
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