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Changing compression from default to zstd for smaller file sizes #11

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7db0a40
Changing compression to zstd
kelly-nelson Mar 31, 2026
32db38a
Merge remote-tracking branch 'origin-upsteam/develop' into develop
kelly-nelson Mar 31, 2026
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51 changes: 24 additions & 27 deletions StandardPlugin/ADAPTParquet.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -44,39 +44,36 @@ public void Write(string outputFile)
};
var geometadata = GeoParquet.GeoMetadata.GetGeoMetadata(geoColumn);

using (var fs = File.Create(outputFile))
using (var writer = new ParquetFileWriter(outputFile, dataFields.ToArray(), Compression.Zstd, keyValueMetadata: geometadata))
{
using (var writer = new ParquetFileWriter(fs, dataFields.ToArray(), keyValueMetadata: geometadata))
int startIndex = 0;
int remainingRowGroups = ColumnData.Geometries.Count / RowGroupSize;
if (ColumnData.Geometries.Count % RowGroupSize > 0)
{
int startIndex = 0;
int remainingRowGroups = ColumnData.Geometries.Count / RowGroupSize;
if (ColumnData.Geometries.Count % RowGroupSize > 0)
{
remainingRowGroups++;
}
while (remainingRowGroups > 0)
remainingRowGroups++;
}
while (remainingRowGroups > 0)
{
using (RowGroupWriter rg = writer.AppendRowGroup())
{
using (RowGroupWriter rg = writer.AppendRowGroup())
if (ColumnData.Timestamps.Any())
{
var timestampWriter = rg.NextColumn().LogicalWriter<string>();
var timestamps = ColumnData.Timestamps.Skip(startIndex).Take(RowGroupSize);
timestampWriter.WriteBatch(timestamps.Select(t => t.ToString("O", CultureInfo.InvariantCulture)).ToArray()); ;
}
foreach (var doubleColumn in ColumnData.Columns)
{
if (ColumnData.Timestamps.Any())
{
var timestampWriter = rg.NextColumn().LogicalWriter<string>();
var timestamps = ColumnData.Timestamps.Skip(startIndex).Take(RowGroupSize);
timestampWriter.WriteBatch(timestamps.Select(t => t.ToString("O", CultureInfo.InvariantCulture)).ToArray()); ;
}
foreach (var doubleColumn in ColumnData.Columns)
{
var doubleWriter = rg.NextColumn().LogicalWriter<double?>();
var values = doubleColumn.Values.Skip(startIndex).Take(RowGroupSize);
doubleWriter.WriteBatch(values.ToArray());
}
var geometries = ColumnData.Geometries.Skip(startIndex).Take(RowGroupSize);
var geometryWriter = rg.NextColumn().LogicalWriter<byte[]>();
geometryWriter.WriteBatch(geometries.ToArray());
var doubleWriter = rg.NextColumn().LogicalWriter<double?>();
var values = doubleColumn.Values.Skip(startIndex).Take(RowGroupSize);
doubleWriter.WriteBatch(values.ToArray());
}
startIndex += RowGroupSize;
remainingRowGroups--;
var geometries = ColumnData.Geometries.Skip(startIndex).Take(RowGroupSize);
var geometryWriter = rg.NextColumn().LogicalWriter<byte[]>();
geometryWriter.WriteBatch(geometries.ToArray());
}
startIndex += RowGroupSize;
remainingRowGroups--;
}
}
}
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