paimon-common/src/main/java/org/apache/paimon/utils/Projection.java [161:198]:
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    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof Projection)) {
            return false;
        }
        Projection other = (Projection) o;
        if (!this.isNested() && !other.isNested()) {
            return Arrays.equals(this.toTopLevelIndexes(), other.toTopLevelIndexes());
        }
        return Arrays.deepEquals(this.toNestedIndexes(), other.toNestedIndexes());
    }

    @Override
    public int hashCode() {
        if (isNested()) {
            return Arrays.deepHashCode(toNestedIndexes());
        }
        return Arrays.hashCode(toTopLevelIndexes());
    }

    @Override
    public String toString() {
        if (isNested()) {
            return "Nested projection = " + Arrays.deepToString(toNestedIndexes());
        }
        return "Top level projection = " + Arrays.toString(toTopLevelIndexes());
    }

    private static class EmptyProjection extends Projection {

        static final EmptyProjection INSTANCE = new EmptyProjection();

        private EmptyProjection() {}

        @Override
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paimon-flink/paimon-flink-common/src/main/java/org/apache/paimon/flink/Projection.java [93:130]:
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    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof Projection)) {
            return false;
        }
        Projection other = (Projection) o;
        if (!this.isNested() && !other.isNested()) {
            return Arrays.equals(this.toTopLevelIndexes(), other.toTopLevelIndexes());
        }
        return Arrays.deepEquals(this.toNestedIndexes(), other.toNestedIndexes());
    }

    @Override
    public int hashCode() {
        if (isNested()) {
            return Arrays.deepHashCode(toNestedIndexes());
        }
        return Arrays.hashCode(toTopLevelIndexes());
    }

    @Override
    public String toString() {
        if (isNested()) {
            return "Nested projection = " + Arrays.deepToString(toNestedIndexes());
        }
        return "Top level projection = " + Arrays.toString(toTopLevelIndexes());
    }

    private static class EmptyProjection extends Projection {

        static final EmptyProjection INSTANCE = new EmptyProjection();

        private EmptyProjection() {}

        @Override
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