/// <summary>
/// Evaluates the node asynchronously, using the variables provided in
/// the <paramref name="Variables"/> collection.
/// </summary>
/// <param name="Variables">Variables collection.</param>
/// <returns>Result.</returns>
public async Task <IElement> EvaluateAsync(Variables Variables)
{
IDataSource Source = this.source.GetSource(Variables);
string Name = InsertValues.GetName(this.name, Variables);
if (!await Source.DropIndex(Name))
{
throw new ScriptRuntimeException("Index not found.", this);
}
return(new StringValue(Name));
}
/// <summary>
/// Evaluates the node asynchronously, using the variables provided in
/// the <paramref name="Variables"/> collection.
/// </summary>
/// <param name="Variables">Variables collection.</param>
/// <returns>Result.</returns>
public async Task <IElement> EvaluateAsync(Variables Variables)
{
IDataSource Source = this.source.GetSource(Variables);
string Name = InsertValues.GetName(this.name, Variables);
string[] Fields = new string[this.nrColumns];
int i;
for (i = 0; i < this.nrColumns; i++)
{
string s = InsertValues.GetName(this.columns[i], Variables);
Fields[i] = this.ascending[i] ? s : "-" + s;
}
await Source.CreateIndex(Name, Fields);
return(new StringValue(Name));
}