Fix z-index bug for .sparkline-tooltip in StagePerformance details page. #1113
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z-index of
.sparkline-tooltip
(100) is smaller than that of#operator-detail-modal
(1050), so when we go into query detail page → click Stage Performance → click one specific operator → hover on any of statistic, we cannot see the tooltip clearly.I think 1051 is ok, but I am not sure if it will have impact on other components.