paimon-spark/paimon-spark-2/src/main/java/org/apache/paimon/spark/SparkDataSourceReader.java [93:117]:
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    @Override
    public Statistics estimateStatistics() {
        long rowCount = 0L;

        for (Split split : splits()) {
            rowCount += split.rowCount();
        }

        final long numRows = rowCount;
        final long sizeInBytes = readSchema().defaultSize() * numRows;

        return new Statistics() {
            @Override
            public OptionalLong sizeInBytes() {
                return OptionalLong.of(sizeInBytes);
            }

            @Override
            public OptionalLong numRows() {
                return OptionalLong.of(numRows);
            }
        };
    }

    @Override
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paimon-spark/paimon-spark-common/src/main/java/org/apache/paimon/spark/SparkScan.java [85:109]:
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    @Override
    public Statistics estimateStatistics() {
        long rowCount = 0L;

        for (Split split : splits()) {
            rowCount += split.rowCount();
        }

        final long numRows = rowCount;
        final long sizeInBytes = readSchema().defaultSize() * numRows;

        return new Statistics() {
            @Override
            public OptionalLong sizeInBytes() {
                return OptionalLong.of(sizeInBytes);
            }

            @Override
            public OptionalLong numRows() {
                return OptionalLong.of(numRows);
            }
        };
    }

    @Override
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