Repeated columns error

[moaxcp]

Hello,

Great library! I am trying to optimize some data by splitting a string into a repeated field but I ran into an issue when using REPEATED. I wrote a small example.

$schema = Schema::with(FlatColumn::string('test'));
$writer = new Writer();
$writer->open('/path/test.parquet', $schema);
$writer->writeRow(['test' => ['one', 'two', 'three']]);
$writer->close();

This results in an error.

TypeError: Flow\Parquet\Dremel\ColumnData\FlatValue::__construct(): Argument #4 ($value) must be of type string|int|float|bool|null, array given

Shouldn't this work or am I using this feature wrong?

[norberttech]

Hey @moaxcp !
Yea I think this should be explained better covered in documentation.
Repetition::REPEATED - this is not how you can store ['one', 'two', 'three'] in test column.

['one', 'two', 'three'] - in parquet this is list<string>, as there is no such concept as array in parquet types.

I prepared for you working example here so you can play with it.

I'm closing it, as it's not really a bug, but feel free to use this issue in case of any further questions/issues