MaterializedViewWindowScanRule.java

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package org.apache.doris.nereids.rules.exploration.mv;

import org.apache.doris.nereids.CascadesContext;
import org.apache.doris.nereids.rules.Rule;
import org.apache.doris.nereids.rules.RuleType;
import org.apache.doris.nereids.rules.exploration.mv.StructInfo.PlanCheckContext;
import org.apache.doris.nereids.rules.exploration.mv.mapping.SlotMapping;
import org.apache.doris.nereids.trees.plans.Plan;
import org.apache.doris.nereids.trees.plans.logical.LogicalCatalogRelation;
import org.apache.doris.nereids.trees.plans.logical.LogicalFilter;
import org.apache.doris.nereids.trees.plans.logical.LogicalProject;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;

import java.util.List;

/**
 * Materialized view rewrite rule for window on scan
 */
public class MaterializedViewWindowScanRule extends AbstractMaterializedViewWindowRule {

    public static MaterializedViewWindowScanRule INSTANCE = new MaterializedViewWindowScanRule();

    @Override
    protected Plan rewriteQueryByView(MatchMode matchMode, StructInfo queryStructInfo, StructInfo viewStructInfo,
            SlotMapping viewToQuerySlotMapping, Plan tempRewritedPlan, MaterializationContext materializationContext,
            CascadesContext cascadesContext) {
        return super.rewriteQueryByView(matchMode, queryStructInfo, viewStructInfo, viewToQuerySlotMapping,
                tempRewritedPlan, materializationContext, cascadesContext);
    }

    /**
     * Check window pattern is valid or not
     */
    @Override
    protected boolean checkQueryPattern(StructInfo structInfo, CascadesContext cascadesContext) {
        PlanCheckContext checkContext = PlanCheckContext.of(ImmutableSet.of());
        return structInfo.getTopPlan().accept(StructInfo.SCAN_PLAN_PATTERN_CHECKER, checkContext)
                && !checkContext.isContainsTopAggregate() && checkContext.isContainsTopWindow()
                && checkContext.getTopWindowNum() <= 1;
    }

    @Override
    public List<Rule> buildRules() {
        return ImmutableList.of(
                logicalFilter(logicalProject(logicalWindow(subTree(
                        LogicalProject.class, LogicalFilter.class, LogicalCatalogRelation.class))))
                        .thenApplyMultiNoThrow(
                                ctx -> {
                                    return rewrite(ctx.root, ctx.cascadesContext);
                                }).toRule(RuleType.MATERIALIZED_VIEW_FILTER_PROJECT_WINDOW_SCAN),
                logicalProject(logicalFilter(logicalWindow(subTree(
                        LogicalProject.class, LogicalFilter.class, LogicalCatalogRelation.class))))
                        .thenApplyMultiNoThrow(
                                ctx -> {
                                    return rewrite(ctx.root, ctx.cascadesContext);
                                }).toRule(RuleType.MATERIALIZED_VIEW_PROJECT_FILTER_WINDOW_SCAN),
                logicalProject(logicalWindow(subTree(
                        LogicalProject.class, LogicalFilter.class, LogicalCatalogRelation.class)))
                        .thenApplyMultiNoThrow(
                                ctx -> {
                                    return rewrite(ctx.root, ctx.cascadesContext);
                                }).toRule(RuleType.MATERIALIZED_VIEW_PROJECT_WINDOW_SCAN),
                logicalFilter(logicalWindow(subTree(
                        LogicalProject.class, LogicalFilter.class, LogicalCatalogRelation.class)))
                        .thenApplyMultiNoThrow(
                                ctx -> {
                                    return rewrite(ctx.root, ctx.cascadesContext);
                                }).toRule(RuleType.MATERIALIZED_VIEW_FILTER_WINDOW_SCAN),
                logicalWindow(subTree(
                        LogicalProject.class, LogicalFilter.class, LogicalCatalogRelation.class))
                        .thenApplyMultiNoThrow(
                                ctx -> {
                                    return rewrite(ctx.root, ctx.cascadesContext);
                                }).toRule(RuleType.MATERIALIZED_VIEW_ONLY_WINDOW_SCAN)
                );
    }
}