使用dplyr和paste0汇总和比较结果后,没有返回任何记录

Declare @sStudy varchar(50)
Set @sStudy = Convert(Varchar(50),@StudyID)
Declare @inquery nvarchar(max) = N'Select
        c.StudyID, c.RespID, c.ProductNumber, c.ProductSequence, c.BottomScaleValue, 
        c.BottomScaleAnchor, c.TopScaleValue, c.TopScaleAnchor, c.StudyDate,
        c.DayOfWeek, c.A, c.B, c.C, c.D, c.E, c.F,
        c.DependentVarYN, c.VariableAttributeID, c.VarAttributeName, c.[1] as c1, 
        c.[2] as c2, c.[3] as c3, c.[4] as c4, c.[5] as c5, c.[6] as c6, c.[7] as c7, c.[8] as c8
        from ClosedStudyResponses c
        --Sensory Value Attributes only for mean and standard deviation analytics.
        where VariableAttributeID = 1
        and c.StudyID =' +@sStudy ;

BEGIN TRY
        --Insert into CodeMeans
        exec sp_execute_external_script
        @language = N'R',
        @script = N'
        library(dplyr)
        codemeans <- function(StudyID){
            res <- InputDataSet %>%
                group_by (StudyID, ProductNumber) %>%
                summarise_all(.funs=c(mean, sd)) %>%
                setNames(c("StudyID","ProductNumber",
                paste0("c",1:8, "_mean"),
                paste0("c",1:8, "_sd")))
            df <- data.frame(res)
            }
            ',
@input_data_1 = @inquery,
@output_data_1_name = N'df',
@params = N'@StudyID int',
@StudyID = @StudyID

当我通过提供有效的studyID来执行存储过程时,查询结束但不包含任何数据,尽管源表在某些(如果不是大多数)列中包含数据。