public void Database_PartitionedBuildAndRead()
{
long currentFileLimit = BinaryTableWriter.ColumnFileSizeLimit;
try
{
string tablePath = @"Table\MultiPartition\Full\2018.06.06 00.00.00Z";
int length = 10 * 1024 * 1024;
// Set limit to 10MB
BinaryTableWriter.ColumnFileSizeLimit = length;
// Build a table with 10 million integers
IXTable table = SampleDatabase.XDatabaseContext.FromArrays(length)
.WithColumn("ID", Enumerable.Range(0, length).ToArray())
.Query($@"write ""{tablePath}""", SampleDatabase.XDatabaseContext);
table.RunAndDispose();
// Verify there are multiple partitions created (four should exactly fit the rows)
Assert.IsTrue(SampleDatabase.XDatabaseContext.StreamProvider.Exists($@"{tablePath}\\0\\Schema.csv"));
Assert.IsTrue(SampleDatabase.XDatabaseContext.StreamProvider.Exists($@"{tablePath}\\1\\Schema.csv"));
Assert.IsTrue(SampleDatabase.XDatabaseContext.StreamProvider.Exists($@"{tablePath}\\2\\Schema.csv"));
Assert.IsTrue(SampleDatabase.XDatabaseContext.StreamProvider.Exists($@"{tablePath}\\3\\Schema.csv"));
// Verify no extra partitions
Assert.IsFalse(SampleDatabase.XDatabaseContext.StreamProvider.Exists($@"{tablePath}\\4\\Schema.csv"));
// Verify Partitions.csv at root (only)
Assert.IsTrue(SampleDatabase.XDatabaseContext.StreamProvider.Exists($@"{tablePath}\\Partitions.csv"));
Assert.IsFalse(SampleDatabase.XDatabaseContext.StreamProvider.Exists($@"{tablePath}\\2\\Partitions.csv"));
// Read the table; verify 10M rows reported
Assert.AreEqual(length, SampleDatabase.XDatabaseContext.Query("read MultiPartition").RunAndDispose().RowCount);
// Test a where clause crossing partitions
Assert.AreEqual(5242880, SampleDatabase.XDatabaseContext.Query("read MultiPartition\r\nwhere [ID] < 5242880").RunAndDispose().RowCount);
}
finally
{
BinaryTableWriter.ColumnFileSizeLimit = currentFileLimit;
}
}