dpruess commented on issue #30914: URL: https://github.com/apache/superset/issues/30914#issuecomment-4544511302
Hi @rusackas @sfirke, I can reproduce the issue described in this thread. It still persists in Superset 6.1 and I would like to ask you to reopen it. As described, in a 100% stacked bar chart with Contribution Mode = Row, small segments are silently dropped from the rendering even though the underlying data is present and the percentages sum to 100%. **The bug only occurs in horizontal orientation** — with vertical bars the same chart on the same data renders correctly (see screenshots below). **Screenshots** Vertical (correct) — same data, same config, all segments rendered: <img width="2559" height="1087" alt="Image" src="https://github.com/user-attachments/assets/cd044b61-ba12-4652-9b97-909393e1552f"; /> Horizontal (buggy) — visible gaps, bars do not reach 100%: <img width="2559" height="1079" alt="Image" src="https://github.com/user-attachments/assets/cb3b4bf6-8220-41e6-86b1-4d8d57e848e3"; /> **Reproducible SQL Query** ```sql -- Reproducible example for stacked bar chart + contribution mode (row) bug -- Each category sums to 1.0 across the 8 response buckets. WITH survey_data AS ( SELECT * FROM (VALUES ('Market_A', 'freq_1_multiple_per_week', 0.04957923259683993), ('Market_A', 'freq_2_once_per_week', 0.11473646865673656), ('Market_A', 'freq_3_every_2_weeks', 0.08411398260985987), ('Market_A', 'freq_4_once_per_month', 0.07613464543474366), ('Market_A', 'freq_5_every_2_3_months', 0.05740424340773429), ('Market_A', 'freq_6_less_often', 0.10598774638925428), ('Market_A', 'freq_7_never_but_nearby', 0.07463807633186544), ('Market_A', 'freq_8_never_no_market', 0.43740560457296596), ('Market_B', 'freq_1_multiple_per_week', 0.04741191013541650), ('Market_B', 'freq_2_once_per_week', 0.14180686001291035), ('Market_B', 'freq_3_every_2_weeks', 0.09994411030913514), ('Market_B', 'freq_4_once_per_month', 0.08712060362137433), ('Market_B', 'freq_5_every_2_3_months', 0.07750892275541255), ('Market_B', 'freq_6_less_often', 0.10841262868162947), ('Market_B', 'freq_7_never_but_nearby', 0.07689863404222866), ('Market_B', 'freq_8_never_no_market', 0.36089633044189300), ('Market_C', 'freq_1_multiple_per_week', 0.09963048973353685), ('Market_C', 'freq_2_once_per_week', 0.22469041737551800), ('Market_C', 'freq_3_every_2_weeks', 0.16380472368977445), ('Market_C', 'freq_4_once_per_month', 0.12916694024691677), ('Market_C', 'freq_5_every_2_3_months', 0.11948047832935614), ('Market_C', 'freq_6_less_often', 0.14454744216522220), ('Market_C', 'freq_7_never_but_nearby', 0.06277281650916573), ('Market_C', 'freq_8_never_no_market', 0.05590669195050987), ('Market_D', 'freq_1_multiple_per_week', 0.04386839304959836), ('Market_D', 'freq_2_once_per_week', 0.13782144517688577), ('Market_D', 'freq_3_every_2_weeks', 0.10545432513578293), ('Market_D', 'freq_4_once_per_month', 0.12258455519862200), ('Market_D', 'freq_5_every_2_3_months', 0.12576791799389650), ('Market_D', 'freq_6_less_often', 0.20418835994563772), ('Market_D', 'freq_7_never_but_nearby', 0.10411585436455739), ('Market_D', 'freq_8_never_no_market', 0.15619914913501930), ('Market_E', 'freq_1_multiple_per_week', 0.09443057881604648), ('Market_E', 'freq_2_once_per_week', 0.21576911140021532), ('Market_E', 'freq_3_every_2_weeks', 0.15327581542307758), ('Market_E', 'freq_4_once_per_month', 0.13789071873079867), ('Market_E', 'freq_5_every_2_3_months', 0.12629513383045002), ('Market_E', 'freq_6_less_often', 0.15005139139871865), ('Market_E', 'freq_7_never_but_nearby', 0.08464066799736332), ('Market_E', 'freq_8_never_no_market', 0.03764658240332997), ('Market_F', 'freq_1_multiple_per_week', 0.07123371598255984), ('Market_F', 'freq_2_once_per_week', 0.15105295755986892), ('Market_F', 'freq_3_every_2_weeks', 0.16420179955913214), ('Market_F', 'freq_4_once_per_month', 0.11539479946921805), ('Market_F', 'freq_5_every_2_3_months', 0.10186332401754646), ('Market_F', 'freq_6_less_often', 0.16414613694143945), ('Market_F', 'freq_7_never_but_nearby', 0.14727509153225507), ('Market_F', 'freq_8_never_no_market', 0.08483217493798008), ('Market_G', 'freq_1_multiple_per_week', 0.06622545665543873), ('Market_G', 'freq_2_once_per_week', 0.13863795548156643), ('Market_G', 'freq_3_every_2_weeks', 0.11297744573184368), ('Market_G', 'freq_4_once_per_month', 0.10890347312644783), ('Market_G', 'freq_5_every_2_3_months', 0.09622365080734895), ('Market_G', 'freq_6_less_often', 0.16721524557021544), ('Market_G', 'freq_7_never_but_nearby', 0.14809708304228722), ('Market_G', 'freq_8_never_no_market', 0.16171968958485172), ('Market_H', 'freq_1_multiple_per_week', 0.15035999731330770), ('Market_H', 'freq_2_once_per_week', 0.24021340746551073), ('Market_H', 'freq_3_every_2_weeks', 0.17043573402321976), ('Market_H', 'freq_4_once_per_month', 0.12247282115077646), ('Market_H', 'freq_5_every_2_3_months', 0.08966118987151522), ('Market_H', 'freq_6_less_often', 0.11961309282338696), ('Market_H', 'freq_7_never_but_nearby', 0.05120620500071224), ('Market_H', 'freq_8_never_no_market', 0.05603755235157094) ) AS t(category, response_bucket, share) ) SELECT * FROM survey_data ORDER BY category, response_bucket; ``` **Chart configuration** - Dimension: category - Metric: AVG(share) - Breakdowns / Series: response_bucket - Stacked Style: Stack - Contribution Mode: Row - Orientation: Horizontal → bug occurs / Vertical → renders correctly Happy to provide more details, additional screenshots, or test a patch if needed. -- This is an automated message from the Apache Git Service. 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