Examples of org.apache.vxquery.compiler.rewriter.rules.ConvertAssignToAggregateRule

Package org.apache.vxquery.compiler.rewriter.rules

Examples of org.apache.vxquery.compiler.rewriter.rules.ConvertAssignToAggregateRule

org.apache.vxquery.compiler.rewriter.rules.ConvertAssignToAggregateRule
The rule searches for assign operators that have a xquery aggregate function. The aggregate function will be more efficient when used by an aggregate operator. XQuery aggregate functions are implemented in both scalar (one XDM Instance input as a sequence) and iterative (a stream of XDM Instances each one is single object).
```
 Before plan__parent ASSIGN( $v2 : sf1( $v0 ) ) plan__child Where sf1 is a XQuery aggregate function expression (count, max, min,  average, sum) with any supporting functions like treat, promote or data.  The variable $v0 is defined in plan__child. After plan__parent SUBPLAN{ AGGREGATE( $v2 : af1( $v1 ) ) UNNEST( $v1 : iterate( $v0 ) ) NESTEDTUPLESOURCE } plan__child 
```
@author prestonc

        normalization.add(new ConsolidateAssignAggregateRule());
        normalization.add(new RemoveRedundantVariablesRule());
        normalization.add(new RemoveUnusedAssignAndAggregateRule());


        // Find assign for scalar aggregate function.
        normalization.add(new ConvertAssignToAggregateRule());


        // Use two step aggregate operators if possible.
        normalization.add(new IntroduceTwoStepAggregateRule());


        // Used to clean up any missing noops after all the subplans have been altered.

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edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable

edu.uci.ics.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression

edu.uci.ics.hyracks.algebricks.core.algebra.expressions.AggregateFunctionCallExpression

edu.uci.ics.hyracks.algebricks.core.algebra.expressions.UnnestingFunctionCallExpression

edu.uci.ics.hyracks.algebricks.core.algebra.expressions.VariableReferenceExpression

edu.uci.ics.hyracks.algebricks.core.algebra.functions.IFunctionInfo

edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator

edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AggregateOperator

edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AssignOperator

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