fluss-server/src/main/java/com/alibaba/fluss/server/kv/rowmerger/FirstRowRowMerger.java [51:58]:
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    public RowMerger configureTargetColumns(@Nullable int[] targetColumns) {
        if (targetColumns == null) {
            return this;
        } else {
            throw new UnsupportedOperationException(
                    "Partial update is not supported for the first_row merge engine.");
        }
    }
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fluss-server/src/main/java/com/alibaba/fluss/server/kv/rowmerger/VersionedRowMerger.java [72:79]:
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    public RowMerger configureTargetColumns(@Nullable int[] targetColumns) {
        if (targetColumns == null) {
            return this;
        } else {
            throw new UnsupportedOperationException(
                    "Partial update is not supported for the versioned merge engine.");
        }
    }
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