public ColumnStats GetColumnStats(SchemaElement schema)
{
if (_schemaToStats.TryGetValue(schema, out ColumnStats result))
{
return(result);
}
ColumnStats stats = CalculateStats(schema);
_schemaToStats[schema] = stats;
return(stats);
}
private ColumnStats CalculateStats(SchemaElement schema)
{
int index = _ds.Schema.GetElementIndex(schema);
var stats = new ColumnStats();
foreach (object value in _ds.GetColumn(index))
{
if (value == null)
{
stats.NullCount += 1;
}
}
return(stats);
}