DataSink.java

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// to you under the Apache License, Version 2.0 (the
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//   http://www.apache.org/licenses/LICENSE-2.0
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// This file is copied from
// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/DataSink.java
// and modified by Doris

package org.apache.doris.planner;

import org.apache.doris.catalog.MysqlTable;
import org.apache.doris.catalog.OdbcTable;
import org.apache.doris.catalog.TableIf;
import org.apache.doris.common.AnalysisException;
import org.apache.doris.datasource.hive.HMSExternalTable;
import org.apache.doris.datasource.iceberg.IcebergExternalTable;
import org.apache.doris.datasource.odbc.sink.OdbcTableSink;
import org.apache.doris.thrift.TDataSink;
import org.apache.doris.thrift.TExplainLevel;

/**
 * A DataSink describes the destination of a plan fragment's output rows.
 * The destination could be another plan fragment on a remote machine,
 * or a table into which the rows are to be inserted
 * (i.e., the destination of the last fragment of an INSERT statement).
 */
public abstract class DataSink {
    // Fragment that this DataSink belongs to. Set by the PlanFragment enclosing this sink.
    protected PlanFragment fragment;
    protected boolean isMerge = false;

    /**
     * Return an explain string for the DataSink. Each line of the explain will be
     * prefixed
     * by "prefix"
     *
     * @param prefix each explain line will be started with the given prefix
     * @return
     */
    public abstract String getExplainString(String prefix, TExplainLevel explainLevel);

    protected abstract TDataSink toThrift();

    public void setFragment(PlanFragment fragment) {
        this.fragment = fragment;
    }

    public PlanFragment getFragment() {
        return fragment;
    }

    public abstract PlanNodeId getExchNodeId();

    public abstract DataPartition getOutputPartition();

    public static DataSink createDataSink(TableIf table) throws AnalysisException {
        if (table instanceof MysqlTable) {
            return new MysqlTableSink((MysqlTable) table);
        } else if (table instanceof OdbcTable) {
            return new OdbcTableSink((OdbcTable) table);
        } else if (table instanceof HMSExternalTable) {
            return new HiveTableSink((HMSExternalTable) table);
        } else if (table instanceof IcebergExternalTable) {
            return new IcebergTableSink((IcebergExternalTable) table);
        } else {
            throw new AnalysisException("Unknown table type " + table.getType());
        }
    }

    public boolean isMerge() {
        return isMerge;
    }

    public void setMerge(boolean merge) {
        isMerge = merge;
    }
}