StatementScopeIdGenerator.java

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package org.apache.doris.nereids.trees.expressions;

import org.apache.doris.common.IdGenerator;
import org.apache.doris.nereids.StatementContext;
import org.apache.doris.nereids.trees.plans.ObjectId;
import org.apache.doris.nereids.trees.plans.RelationId;
import org.apache.doris.nereids.trees.plans.TableId;
import org.apache.doris.qe.ConnectContext;

import com.google.common.annotations.VisibleForTesting;

/**
 * The util of named expression.
 */
public class StatementScopeIdGenerator {

    // for ut test only, ExprId starts with 10000 to avoid duplicate ExprId. In ut, before creating ConnectContext,
    // table is already created, and hence column.exprId may be recreated during applying rules.
    private static StatementContext statementContext = new StatementContext(10000);

    public static IdGenerator<ExprId> getExprIdGenerator() {
        return getStatementContext().getExprIdGenerator();
    }

    public static ExprId newExprId() {
        return getStatementContext().getNextExprId();
    }

    public static ObjectId newObjectId() {
        return getStatementContext().getNextObjectId();
    }

    public static RelationId newRelationId() {
        return getStatementContext().getNextRelationId();
    }

    public static CTEId newCTEId() {
        return getStatementContext().getNextCTEId();
    }

    public static TableId newTableId() {
        return getStatementContext().getNextTableId();
    }

    /**
     *  Reset Id Generator
     */
    @VisibleForTesting
    public static void clear() throws Exception {
        if (ConnectContext.get() != null) {
            ConnectContext.get().setStatementContext(new StatementContext());
        }
        statementContext = new StatementContext();
    }

    /** getStatementContext */
    public static StatementContext getStatementContext() {
        ConnectContext connectContext = ConnectContext.get();
        if (connectContext == null || connectContext.getStatementContext() == null) {
            return statementContext;
        }
        return connectContext.getStatementContext();
    }
}