Prevent fatal error when no values are set in ColumnChunkStatistics

[stloyd]

Change Log

Added

Fixed

• Prevent fatal error when no values are set in `ColumnChunkStatistics`

Changed

Removed

Deprecated

Security

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Description

Code borrowed from: #653

Error:

Fatal error: Uncaught DivisionByZeroError: Division by zero in /Users/stloyd/Documents/flow/src/lib/parquet/src/Flow/Parquet/ParquetFile/RowGroupBuilder/ColumnChunkStatistics.php:71
Stack trace:
#0 /Users/stloyd/Documents/flow/src/lib/parquet/src/Flow/Parquet/ParquetFile/RowGroupBuilder/PagesBuilder.php(25): Flow\Parquet\ParquetFile\RowGroupBuilder\ColumnChunkStatistics->cardinalityRation()
#1 /Users/stloyd/Documents/flow/src/lib/parquet/src/Flow/Parquet/ParquetFile/RowGroupBuilder/ColumnChunkBuilder.php(34): Flow\Parquet\ParquetFile\RowGroupBuilder\PagesBuilder->build(Object(Flow\Parquet\ParquetFile\Schema\FlatColumn), Array, Object(Flow\Parquet\ParquetFile\RowGroupBuilder\ColumnChunkStatistics))
#2 /Users/stloyd/Documents/flow/src/lib/parquet/src/Flow/Parquet/ParquetFile/RowGroupBuilder.php(63): Flow\Parquet\ParquetFile\RowGroupBuilder\ColumnChunkBuilder->flush(4)
#3 /Users/stloyd/Documents/flow/src/lib/parquet/src/Flow/Parquet/Writer.php(59): Flow\Parquet\ParquetFile\RowGroupBuilder->flush(4)
#4 /Users/stloyd/Documents/flow/var/profile.php(65): Flow\Parquet\Writer->write('/Users/stloyd/D...', Object(Flow\Parquet\ParquetFile\Schema), Array)
#5 {main}
  thrown in /Users/stloyd/Documents/flow/src/lib/parquet/src/Flow/Parquet/ParquetFile/RowGroupBuilder/ColumnChunkStatistics.php on line 71