Skip to main content
cancel
Showing results for 
Search instead for 
Did you mean: 

Did you hear? There's a new SQL AI Developer certification (DP-800). Start preparing now and be one of the first to get certified. Register now

Reply
Anonymous
Not applicable

Data reduction algorithm

Hi,

 

im working on custom visual that returns this error: "too many 'Task No' values" Not displaying all data. Filter the data or choose another field."

 

I tried to fix this according the data reduction algorithm: https://github.com/mvgaliev/PowerBI-visuals/blob/942d72065ec6703878249d32cb8df41a00827750/Capabiliti...


The error is due to "tasks".

so i tried this: (on capabilities.json)

 

    "categorical": {
                "categories": {
                    "select": [
                         {
                            "for": {
                                "in": "Task"
                            } , "dataReductionAlgorithm": {
                                "top": {
                                    "count": 30000
                                }
                            }
                        }, 
                        {
                            "for": {
                                "in": "Parent"
                            }
                        },
                    
                        {
                            "for": {
                                "in": "StartDate"
                            }
                        },
                        {
                            "for": {
                                "in": "Resource"
                            }
                        }
                    ]
                },
                "values": {
                    "group": {
                        "by": "Legend",
                        "select": [
                            {
                                "for": {
                                    "in": "EndDate"
                                }
                            },
                            {
                                "for": {
                                    "in": "Duration"
                                }
                            }
                        ]
                    }
                }
            }

 

But it seems to have no affect. I also tried to set property to "window" or "bottom" and reduce count.

 

1 REPLY 1
Anonymous
Not applicable

solved:  

In my case it was necessary to place it after select in "categories" and "values"

 

 

  "categorical": {
                "categories": {
                    "select": [
                        {
                            "for": {
                                "in": "Task"
                            }
                        }, 
                        {
                            "for": {
                                "in": "Parent"
                            }
                        },
                    
                        {
                            "for": {
                                "in": "StartDate"
                            }
                        },
                        {
                            "for": {
                                "in": "Resource"
                            }
                        },
                        {
                            "for": {
                                "in": "ParentResource"
                            }
                        },
                        {
                            "for": {
                                "in": "ExtraInformation"
                            }
                        },
                        {
                            "for": {
                                "in": "Milestones"
                            }
                        }
                    ], "dataReductionAlgorithm": {
                        "top": {
                            "count": 30000
                        }
                    }  
                },
                "values": {
                    "group": {
                        "by": "Legend",
                        "select": [
                            {
                                "for": {
                                    "in": "EndDate"
                                }
                            },
                            {
                                "for": {
                                    "in": "Duration"
                                }
                            },
                            {
                                "for": {
                                    "in": "Completion"
                                }
                            }
                        ], "dataReductionAlgorithm": {
                        "top": {
                            "count": 30000
                           }
                        }  
                    }
                }
            }

 

 

 

Helpful resources

Announcements
April Power BI Update Carousel

Power BI Monthly Update - April 2026

Check out the April 2026 Power BI update to learn about new features.

Fabric SQL PBI Data Days

Data Days 2026 coming soon!

Sign up to receive a private message when registration opens and key events begin.

New to Fabric survey Carousel

New to Fabric Survey

If you have recently started exploring Fabric, we'd love to hear how it's going. Your feedback can help with product improvements.

Power BI DataViz World Championships carousel

Power BI DataViz World Championships - June 2026

A new Power BI DataViz World Championship is coming this June! Don't miss out on submitting your entry.

Top Solution Authors
Top Kudoed Authors