Examples of IntroduceCollectionRule

org.apache.vxquery.compiler.rewriter.rules.IntroduceCollectionRule

Find the default query plan created for collection and updated it to use parallelization. The rule searches for unnest followed by an assign for the collection function expression. When this plan block exists the data source scan operator added in the blocks place.

 Before plan__parent UNNEST( $v2 : iterate( $v1 ) ) ASSIGN( $v1 : collection( $source ) ) plan__child Where $v1 is not used anywhere else in the plan and $source is: ASSIGN( $source : promote( data( constant ) ) ) or ASSIGN( $source : promote( data( $v0 ) ) ) ASSIGN( $v0 : constant ) After  plan__parent DATASCAN( collection( $source ) , $v2 ) plan__child Where DATASCAN operator is configured to use the collection( $source) for  data represented by the “constant” and $v2 represents the xml document  node.

@author prestonc

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


        // Convert to a data source scan operator.
        normalization.add(new SetCollectionDataSourceRule());
        normalization.add(new IntroduceCollectionRule());
        normalization.add(new RemoveUnusedAssignAndAggregateRule());


        // Adds child steps to the data source scan.
        normalization.add(new ConsolidateUnnestsRule());
        normalization.add(new PushChildIntoDataScanRule());

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


        // Convert to a data source scan operator.
        normalization.add(new SetCollectionDataSourceRule());
        normalization.add(new IntroduceCollectionRule());
        normalization.add(new RemoveUnusedAssignAndAggregateRule());


        // Adds child steps to the data source scan.
        normalization.add(new ConsolidateUnnestsRule());
        normalization.add(new PushChildIntoDataScanRule());

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Examples of IntroduceCollectionRule

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

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