com.mckoi.database
Class QueryPlan.MultiColumnEquiSelectNode
java.lang.Object
com.mckoi.database.QueryPlan.SingleQueryPlanNode
com.mckoi.database.QueryPlan.MultiColumnEquiSelectNode
- All Implemented Interfaces:
- QueryPlanNode, java.io.Serializable, java.lang.Cloneable
- Enclosing class:
- QueryPlan
public static class QueryPlan.MultiColumnEquiSelectNode
- extends QueryPlan.SingleQueryPlanNode
The node for performing an equi-select on a group of columns of the
child node. This is a separate node instead of chained
IndexedSelectNode's so that we might exploit multi-column indexes.
- See Also:
- Serialized Form
Method Summary |
java.lang.Object |
clone()
Deep clone. |
java.util.ArrayList |
discoverCorrelatedVariables(int level,
java.util.ArrayList list)
Default implementation that discovers correlated variables for the
given offset level. |
java.util.ArrayList |
discoverTableNames(java.util.ArrayList list)
Default implementation delegates responsibility to child. |
Table |
evaluate(QueryContext context)
Evaluates the node and returns the result as a Table. |
Methods inherited from class java.lang.Object |
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
QueryPlan.MultiColumnEquiSelectNode
public QueryPlan.MultiColumnEquiSelectNode(QueryPlanNode child,
Variable[] columns,
Expression[] values)
evaluate
public Table evaluate(QueryContext context)
- Description copied from interface:
QueryPlanNode
- Evaluates the node and returns the result as a Table. The
VariableResolver resolves any outer variables
discoverTableNames
public java.util.ArrayList discoverTableNames(java.util.ArrayList list)
- Description copied from class:
QueryPlan.SingleQueryPlanNode
- Default implementation delegates responsibility to child.
- Specified by:
discoverTableNames
in interface QueryPlanNode
- Overrides:
discoverTableNames
in class QueryPlan.SingleQueryPlanNode
discoverCorrelatedVariables
public java.util.ArrayList discoverCorrelatedVariables(int level,
java.util.ArrayList list)
- Description copied from class:
QueryPlan.SingleQueryPlanNode
- Default implementation that discovers correlated variables for the
given offset level.
- Specified by:
discoverCorrelatedVariables
in interface QueryPlanNode
- Overrides:
discoverCorrelatedVariables
in class QueryPlan.SingleQueryPlanNode
clone
public java.lang.Object clone()
throws java.lang.CloneNotSupportedException
- Description copied from class:
QueryPlan.SingleQueryPlanNode
- Deep clone.
- Specified by:
clone
in interface QueryPlanNode
- Overrides:
clone
in class QueryPlan.SingleQueryPlanNode
- Throws:
java.lang.CloneNotSupportedException