PaimonTableDecorators.java

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package org.apache.doris.datasource.paimon;

import org.apache.paimon.table.DelegatedFileStoreTable;
import org.apache.paimon.table.FallbackReadFileStoreTable;
import org.apache.paimon.table.FileStoreTable;

/** Utilities for preserving Paimon's planning decorator invariants. */
public final class PaimonTableDecorators {

    private PaimonTableDecorators() {
    }

    public static FileStoreTable unwrapToFallbackOrBase(FileStoreTable table) {
        FileStoreTable current = table;
        // Fallback dispatch requires the pair to be the system wrapper's immediate child. Paimon
        // does not privilege-wrap system tables, so peeling privilege-only delegates matches its
        // catalog semantics while retaining the one decorator that changes read routing.
        while (current instanceof DelegatedFileStoreTable
                && !(current instanceof FallbackReadFileStoreTable)) {
            current = ((DelegatedFileStoreTable) current).wrapped();
        }
        return current;
    }
}