[GitHub] [echarts] jiawulin001 commented on issue #16700: [Bug] 柱状图在横轴为时间时，无法按照时间正常堆叠

[GitBox <gi...@apache.org>]

jiawulin001 commented on issue #16700:
URL: https://github.com/apache/echarts/issues/16700#issuecomment-1110693178

   ### Problem locating
   In one sentence, Echarts is stacking value by index, not by name.
   Both 5.2.x and 5.3.x deal with stack data here and put it in `storage`:
   https://github.com/apache/echarts/blob/3961cefc0329cfa8782602fc2aea46cc76c3f50e/src/processor/dataStack.ts#L123-L139
   However, `stackedDataRawIndex` is only decided by index of data. So if you have a hole in your stacked data, it will cause wrong stack.
   
   #### Why it works in 5.2.x
   The reason why no error occurs in 5.2.x is that it's using a completely new variable to store stack info instead of taking from `storage`. Check the variable `lastStackCoords` here:
   https://github.com/apache/echarts/blob/000ee7d2d1272cee96b0bd19bff9207301096c8d/src/layout/barGrid.ts#L445
   This is no longer the case in 5.3.x.
   
   #### Why it doesn't work in 5.3.x
   Echarts now pick up stack data directly from `storage` and the 'stack-by-index' error is unveiled as long as there's a hole in stack data. Take a look at the new function in 5.3.x.
   https://github.com/apache/echarts/blob/3961cefc0329cfa8782602fc2aea46cc76c3f50e/src/layout/barGrid.ts#L465
   
   So the 'stack-by-index' problem exists in **BOTH** version but the way to handle it changes in 5.3.x so the error pops up.
   
   ### Solution
   A good and general solution is not yet found by me, but I'll be looking for one and update it when I find it.


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