Deveel.Data.Routines.SystemFunctionsProvider.Count Class Reference

Static Public Member Functions
static InvokeResult	Execute (InvokeContext context)

Detailed Description

Definition at line 157 of file SystemFunctionsProvider.cs.

Member Function Documentation

static InvokeResult Deveel.Data.Routines.SystemFunctionsProvider.Count.Execute ( InvokeContext  context )

inlinestatic

Definition at line 158 of file SystemFunctionsProvider.cs.

                                                                      {
                if (context.GroupResolver == null)
                    throw new Exception("'count' can only be used as an aggregate function.");

                int size = context.GroupResolver.Count;
                DataObject result;
                // if, count(*)
                if (size == 0 || context.Invoke.IsGlobArgument) {
                    result = DataObject.Integer(size);
                } else {
                    // Otherwise we need to count the number of non-null entries in the
                    // columns list(s).

                    int totalCount = size;

                    var exp = context.Arguments[0];
                    for (int i = 0; i < size; ++i) {
                        var val = exp.EvaluateToConstant(context.Request, context.GroupResolver.GetVariableResolver(i));
                        if (val.IsNull) {
                            --totalCount;
                        }
                    }

                    result = DataObject.Integer(totalCount);
                }

                return context.Result(result);
            }

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The documentation for this class was generated from the following file:

• /var/calculate/remote/distfiles/egit-src/deveeldb.git/src/deveeldb/Deveel.Data.Routines/SystemFunctionsProvider.cs