public void DistinctColumn_Conversion()
{
int defaultValue = -1;
Func <DistinctColumn <int> > ctor = () => new DistinctColumn <int>(new NumberColumn <int>(defaultValue), defaultValue);
DistinctColumn <int> column = ctor();
List <int> expected = new List <int>();
// Verify empty and set up to map values by default
Assert.Empty(column);
Assert.True(column.IsMappingValues);
// Round trip and verify it resets back to mapping correctly
column = TreeSerializer.RoundTrip(column, ctor, TreeFormat.Binary);
Assert.Empty(column);
Assert.True(column.IsMappingValues);
// Add 1,000 values with 10 distinct values
for (int i = 0; i < 1000; ++i)
{
int value = i % 10;
column[i] = value;
expected.Add(value);
}
// Verify column is mapping, has 11 unique values (default + 10), and matches expected array
Assert.True(column.IsMappingValues);
Assert.Equal(11, column.DistinctCount);
CollectionReadVerifier.VerifySame(expected, column);
// Round trip; verify mapped column rehydrates properly
column = TreeSerializer.RoundTrip(column, ctor, TreeFormat.Binary);
CollectionReadVerifier.VerifySame(expected, column);
// Add enough values to force the column to convert
for (int i = 1000; i < 1300; ++i)
{
column[i] = i;
expected.Add(i);
}
Assert.False(column.IsMappingValues);
Assert.Equal(-1, column.DistinctCount);
CollectionReadVerifier.VerifySame(expected, column);
// Round-trip; verify individual values column rehydrates properly
column = TreeSerializer.RoundTrip(column, ctor, TreeFormat.Binary);
CollectionReadVerifier.VerifySame(expected, column);
// Test RemoveFromEnd on unmapped form of column
column.RemoveFromEnd(100);
expected.RemoveRange(expected.Count - 100, 100);
CollectionReadVerifier.VerifySame(expected, column);
}
public void DistinctColumn_Remap()
{
int defaultValue = -1;
Func <DistinctColumn <int> > ctor = () => new DistinctColumn <int>(new NumberColumn <int>(defaultValue), defaultValue);
DistinctColumn <int> column = ctor();
List <int> expected = new List <int>();
// Add 1,000 values with 10 distinct values
for (int i = 0; i < 1000; ++i)
{
int value = 1 + i % 10;
column[i] = value;
expected.Add(value);
}
// Verify column is mapping, has 11 unique values (default + 10), and matches expected array
Assert.True(column.IsMappingValues);
Assert.Equal(11, column.DistinctCount);
CollectionReadVerifier.VerifySame(expected, column);
// Verify Trim does not remap
column.Trim();
Assert.True(column.IsMappingValues);
Assert.Equal(11, column.DistinctCount);
CollectionReadVerifier.VerifySame(expected, column);
// Set rows to just three (middle) values
for (int i = 0; i < 1000; ++i)
{
int value = 3 + i % 3;
column[i] = value;
expected[i] = value;
}
// Trim. Verify column finds unused values and removes them, and column values read back correctly
column.Trim();
Assert.True(column.IsMappingValues);
Assert.Equal(4, column.DistinctCount);
CollectionReadVerifier.VerifySame(expected, column);
}