Github user fhueske commented on a diff in the pull request:
    --- Diff: 
    @@ -71,6 +72,21 @@ class DataSetSort(
    +  override def estimateRowCount(metadata: RelMetadataQuery): Double = {
    +    val inputRowCnt = metadata.getRowCount(this.getInput)
    +    if (inputRowCnt == null) {
    +      inputRowCnt
    +    } else {
    +      val rowCount = Math.max(inputRowCnt - limitStart, 0D)
    --- End diff --
    inputRowCount might also just be an estimate and not guaranteed to be 
precise. Returning 1 is more robust, because it does not result in no-cost 
operators downstream.

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