Package com.mckoi.database

Class QueryPlan.SingleRowTableNode

  • All Implemented Interfaces:
    QueryPlanNode, java.io.Serializable, java.lang.Cloneable
    Enclosing class:
    QueryPlan
    public static class QueryPlan.SingleRowTableNode
extends java.lang.Object
implements QueryPlanNode
    A node for creating a table with a single row. This table is useful for queries that have no underlying row. For example, a pure functional table expression.
    See Also:
    Serialized Form

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.Object clone()
      Deep clones this query plan.
      void debugString​(int level, 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.
      java.lang.String titleString()  

      • Methods inherited from class java.lang.Object

        equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • SingleRowTableNode

        public SingleRowTableNode()

    • Method Detail

      • discoverTableNames

        public java.util.ArrayList discoverTableNames​(java.util.ArrayList list)
        Description copied from interface: QueryPlanNode
        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.

        Specified by:
        discoverTableNames in interface QueryPlanNode

      • 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
        Specified by:
        evaluate in interface QueryPlanNode

      • discoverCorrelatedVariables

        public java.util.ArrayList discoverCorrelatedVariables​(int level,
                                                       java.util.ArrayList list)
        Description copied from interface: QueryPlanNode
        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())'
        Specified by:
        discoverCorrelatedVariables in interface QueryPlanNode

      • clone

        public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException
        Description copied from interface: QueryPlanNode
        Deep clones this query plan.
        Specified by:
        clone in interface QueryPlanNode
        Overrides:
        clone in class java.lang.Object
        Throws:
        java.lang.CloneNotSupportedException

      • titleString

        public java.lang.String titleString()

      • debugString

        public void debugString​(int level,
                        java.lang.StringBuffer buf)
        Description copied from interface: QueryPlanNode
        Writes a textural representation of the node to the StringBuffer at the given indent level.
        Specified by:
        debugString in interface QueryPlanNode