AddConstraintCommand.java

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package org.apache.doris.nereids.trees.plans.commands;

import org.apache.doris.catalog.TableIf;
import org.apache.doris.common.Pair;
import org.apache.doris.common.util.MetaLockUtils;
import org.apache.doris.nereids.NereidsPlanner;
import org.apache.doris.nereids.exceptions.AnalysisException;
import org.apache.doris.nereids.properties.PhysicalProperties;
import org.apache.doris.nereids.trees.expressions.SlotReference;
import org.apache.doris.nereids.trees.plans.Plan;
import org.apache.doris.nereids.trees.plans.PlanType;
import org.apache.doris.nereids.trees.plans.commands.ExplainCommand.ExplainLevel;
import org.apache.doris.nereids.trees.plans.logical.LogicalCatalogRelation;
import org.apache.doris.nereids.trees.plans.logical.LogicalPlan;
import org.apache.doris.nereids.trees.plans.visitor.PlanVisitor;
import org.apache.doris.qe.ConnectContext;
import org.apache.doris.qe.StmtExecutor;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import java.util.Comparator;
import java.util.List;
import java.util.Set;

/**
 * add constraint command
 */
public class AddConstraintCommand extends Command implements ForwardWithSync {

    public static final Logger LOG = LogManager.getLogger(AddConstraintCommand.class);

    private final String name;
    private final Constraint constraint;

    /**
     * constructor
     */
    public AddConstraintCommand(String name, Constraint constraint) {
        super(PlanType.ADD_CONSTRAINT_COMMAND);
        this.constraint = constraint;
        this.name = name;
    }

    @Override
    public void run(ConnectContext ctx, StmtExecutor executor) throws Exception {
        Pair<ImmutableList<String>, TableIf> columnsAndTable = extractColumnsAndTable(ctx, constraint.toProject());
        List<TableIf> tables = Lists.newArrayList(columnsAndTable.second);
        Pair<ImmutableList<String>, TableIf> referencedColumnsAndTable = null;
        if (constraint.isForeignKey()) {
            referencedColumnsAndTable = extractColumnsAndTable(ctx, constraint.toReferenceProject());
            tables.add(referencedColumnsAndTable.second);
        }
        tables.sort((Comparator.comparing(TableIf::getId)));
        MetaLockUtils.writeLockTables(tables);
        try {
            if (constraint.isForeignKey()) {
                Preconditions.checkState(referencedColumnsAndTable != null);
                columnsAndTable.second.addForeignConstraint(name, columnsAndTable.first,
                        referencedColumnsAndTable.second, referencedColumnsAndTable.first, false);
            } else if (constraint.isPrimaryKey()) {
                columnsAndTable.second.addPrimaryKeyConstraint(name, columnsAndTable.first, false);
            } else if (constraint.isUnique()) {
                columnsAndTable.second.addUniqueConstraint(name, columnsAndTable.first, false);
            }
        } finally {
            MetaLockUtils.writeUnlockTables(tables);
        }
    }

    private Pair<ImmutableList<String>, TableIf> extractColumnsAndTable(ConnectContext ctx, LogicalPlan plan) {
        NereidsPlanner planner = new NereidsPlanner(ctx.getStatementContext());
        Plan analyzedPlan = planner.planWithLock(plan, PhysicalProperties.ANY, ExplainLevel.ANALYZED_PLAN);
        Set<LogicalCatalogRelation> logicalCatalogRelationSet = analyzedPlan
                .collect(LogicalCatalogRelation.class::isInstance);
        if (logicalCatalogRelationSet.size() != 1) {
            throw new AnalysisException("Can not found table in constraint " + constraint.toString());
        }
        LogicalCatalogRelation catalogRelation = logicalCatalogRelationSet.iterator().next();
        ImmutableList<String> columns = analyzedPlan.getOutput().stream()
                .map(s -> {
                    Preconditions.checkArgument(s instanceof SlotReference
                                    && ((SlotReference) s).getOriginalColumn().isPresent(),
                            "Constraint contains a invalid slot ", s);
                    return ((SlotReference) s).getOriginalColumn().get().getName();
                }).collect(ImmutableList.toImmutableList());
        return Pair.of(columns, catalogRelation.getTable());
    }

    @Override
    public <R, C> R accept(PlanVisitor<R, C> visitor, C context) {
        return visitor.visitAddConstraintCommand(this, context);
    }
}