com.mckoi.database
Class QueryPlan.EquiJoinNode
java.lang.Object
com.mckoi.database.QueryPlan.BranchQueryPlanNode
com.mckoi.database.QueryPlan.EquiJoinNode
- All Implemented Interfaces:
- QueryPlanNode, java.io.Serializable, java.lang.Cloneable
- Enclosing class:
- QueryPlan
public static class QueryPlan.EquiJoinNode
- extends QueryPlan.BranchQueryPlanNode
A branch node for equi-joining two tables together given two sets of
columns. This is a seperate node from a general join operation to allow
for optimizations with multi-column indexes.
An equi-join is the most common type of join.
At query runtime, this decides the best best way to perform the join,
either by
- See Also:
- Serialized Form
Methods inherited from class java.lang.Object |
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
QueryPlan.EquiJoinNode
public QueryPlan.EquiJoinNode(QueryPlanNode left,
QueryPlanNode right,
Variable[] left_cols,
Variable[] right_cols)
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
clone
public java.lang.Object clone()
throws java.lang.CloneNotSupportedException
- Description copied from class:
QueryPlan.BranchQueryPlanNode
- Deep clone.
- Specified by:
clone
in interface QueryPlanNode
- Overrides:
clone
in class QueryPlan.BranchQueryPlanNode
- Throws:
java.lang.CloneNotSupportedException