public IType FindFunctionReturnType(String functionName, IASTNode first)
{
// locate the registered function by the given name
ISQLFunction sqlFunction = RequireSQLFunction(functionName);
// determine the type of the first argument...
IType argumentType = null;
if (first != null)
{
if (sqlFunction is CastFunction)
{
argumentType = TypeFactory.HeuristicType(first.NextSibling.Text);
}
else if (first is SqlNode)
{
argumentType = ((SqlNode)first).DataType;
}
}
return(sqlFunction.ReturnType(argumentType, _sfi));
}
/// <summary>
/// Find the function return type given the function name and the first argument expression node.
/// </summary>
/// <param name="functionName">The function name.</param>
/// <param name="first">The first argument expression.</param>
/// <returns>the function return type given the function name and the first argument expression node.</returns>
public IType FindFunctionReturnType(String functionName, IASTNode first)
{
// locate the registered function by the given name
ISQLFunction sqlFunction = RequireSQLFunction(functionName);
// determine the type of the first argument...
IType argumentType = null;
if (first != null)
{
if (functionName == "cast")
{
argumentType = TypeFactory.HeuristicType(first.NextSibling.Text);
}
else if (first is SqlNode)
{
argumentType = ((SqlNode) first).DataType;
}
}
return sqlFunction.ReturnType(argumentType, _sfi);
}