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

org.apache.vxquery.compiler.rewriter.rules.PushMapOperatorDownThroughProductRule

The rule searches for an inner join operator followed by a map operator. When the map operator only uses variable generated by one side of the join, the operator is pushed down through the product rule.

 Before %PARENT_PLAN ASSIGN | EXCHANGE | SELECT | UNNEST INNERJOIN( true ) { %RIGHT_BRANCH_PLAN } { %LEFT_BRANCH_PLAN } %CHILD_PLAN Where ASSIGN | EXCHANGE | SELECT | UNNEST are operators with the map  property. After When all variables used in ASSIGN | EXCHANGE | SELECT | UNNEST exist in  %RIGHT_BRANCH_PLAN. %PARENT_PLAN INNERJOIN( true ) { ASSIGN | EXCHANGE | SELECT | UNNEST %RIGHT_BRANCH_PLAN } { %LEFT_BRANCH_PLAN } %CHILD_PLAN When all variables used in ASSIGN | EXCHANGE | SELECT | UNNEST exist in  %LEFT_BRANCH_PLAN. %PARENT_PLAN INNERJOIN( true ) { %RIGHT_BRANCH_PLAN } { ASSIGN | EXCHANGE | SELECT | UNNEST %LEFT_BRANCH_PLAN } %CHILD_PLAN

     */
    public final static List<IAlgebraicRewriteRule> buildNestedDataSourceRuleCollection() {
        List<IAlgebraicRewriteRule> xquery = new LinkedList<IAlgebraicRewriteRule>();
        xquery.add(new BreakSelectIntoConjunctsRule());
        xquery.add(new SimpleUnnestToProductRule());
        xquery.add(new PushMapOperatorDownThroughProductRule());
        xquery.add(new PushSubplanWithAggregateDownThroughProductRule());
        xquery.add(new PushSelectDownRule());
        xquery.add(new PushSelectIntoJoinRule());
        // Clean up
        xquery.add(new RemoveRedundantVariablesRule());

     */
    public final static List<IAlgebraicRewriteRule> buildNestedDataSourceRuleCollection() {
        List<IAlgebraicRewriteRule> xquery = new LinkedList<IAlgebraicRewriteRule>();
        xquery.add(new BreakSelectIntoConjunctsRule());
        xquery.add(new SimpleUnnestToProductRule());
        xquery.add(new PushMapOperatorDownThroughProductRule());
        xquery.add(new PushSubplanWithAggregateDownThroughProductRule());
        xquery.add(new PushSelectDownRule());
        xquery.add(new PushSelectIntoJoinRule());
        // Clean up
        xquery.add(new RemoveRedundantVariablesRule());

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

Related Classes of org.apache.vxquery.compiler.rewriter.rules.PushMapOperatorDownThroughProductRule