public ITable Execute(Query query, Expression expression)
{
// Create the QueryProcessor
QueryProcessor processor = new QueryProcessor(transaction);
// If it's a select,
if (expression is SelectExpression) {
QueryOptimizer optimizer = new QueryOptimizer(transaction);
expression = optimizer.SubstituteParameters(expression, query);
expression = optimizer.Qualify(expression);
expression = optimizer.Optimize(expression);
// Execute the query,
return processor.Execute(expression);
}
// Set the parameter as the base table, and the base rowid (the
// parameters table only has 1 row).
processor.PushTable(new QueryParametersTable(query));
processor.UpdateTableRow(new RowId(0));
// Otherwise it must be an interpretable function
if (expression is FunctionExpression) {
string fun_name = (string)expression.GetArgument("name");
if (fun_name.Equals("create_table"))
return CreateTable(expression);
/*
TODO:
if (fun_name.Equals("drop_table"))
return DropTable(processor, expression);
if (fun_name.Equals("create_index"))
return CreateIndex(processor, expression);
if (fun_name.Equals("drop_index"))
return DropIndex(processor, expression);
if (fun_name.Equals("explain_expression"))
return ExplainExpression(expression);
*/
}
throw new NotSupportedException();
}
