VerifyAggregateExpressionsVisitor

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org.apache.derby.impl.sql.compile
Class VerifyAggregateExpressionsVisitor

java.lang.Object
  org.apache.derby.impl.sql.compile.VerifyAggregateExpressionsVisitor

All Implemented Interfaces:: org.apache.derby.iapi.sql.compile.Visitor

public class VerifyAggregateExpressionsVisitor
extends java.lang.Object
implements org.apache.derby.iapi.sql.compile.Visitor

If a RCL (SELECT list) contains an aggregate, then we must verify that the RCL (SELECT list) is valid. For ungrouped queries, the RCL must be composed entirely of valid aggregate expressions - in this case, no column references outside of an aggregate. For grouped aggregates, the RCL must be composed of grouping columns or valid aggregate expressions - in this case, the only column references allowed outside of an aggregate are grouping columns.

Field Summary

private GroupByList groupByList


Constructor Summary

VerifyAggregateExpressionsVisitor(GroupByList groupByList)


Method Summary

boolean skipChildren(org.apache.derby.iapi.sql.compile.Visitable node)
          Don't visit children under an aggregate

boolean stopTraversal()
          Method that is called to see if query tree traversal should be stopped before visiting all nodes.

org.apache.derby.iapi.sql.compile.Visitable visit(org.apache.derby.iapi.sql.compile.Visitable node)
          Verify that this expression is ok for an aggregate query.

Methods inherited from class java.lang.Object

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

Field Detail

groupByList

private GroupByList groupByList

Constructor Detail