[Bug] dataset decals about echarts HOT 5 CLOSED

This is not a problem with decal. Add aria: { decal: { show: true } } to your option

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@Ovilia that does not solve the issue, as now there is a decal on each value. See example:
https://echarts.apache.org/examples/en/editor.html?c=bar-y-category-stack&code=PYBwLglsB2AEC8sDeAoWsCGAnCGBcysAJgKYDGGANgUrAM4AWwA7gWFgK4mwC-vANGmIYwGOiTA0h6OsA5YyJAgG1p6QtAwBbJbADkMEnv6wAblS4EAjALXpamnQT1hmwY2Yu6rJiGBJaAMpgAJ6UurSkFNSEdCFaAEbAMS44GNAA5uF6vLk8agC6QjyCMiQ4JHQqaqjq6qEgunogEEZq-ehFPADcQA

The decal should only be present with the data that has the name "two"

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Dataset is used to seperate data from style, so it's natural that there is no dataset.source.itemStyle option. The correct way to set decal is like:
https://echarts.apache.org/examples/en/editor.html?c=bar-y-category-stack&code=PYBwLglsB2AEC8sDeAoWsCGAnCGBcya6sAJgKYDGGANgUrAM4AWwA7gWFgK5kA0plGgwIBtegwCeAWwBGwWrADkWSmEWwAvv3HS5CxRQhYK1Muo0BdTUS1ESGMBgZkwdIugbAuxsqPfF6aAwpXyUYM34ANxoeAgBGTV5_dEDg0MUwVmBFKJjQhI1_CxskjzIcMmFYEX9UYmIwCRB0kAgzf0L0Yo0AbiA

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Ok thanks for confirming that is the correct approach to take

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This does not work for the bar chart:
https://echarts.apache.org/examples/en/editor.html?c=bar-y-category-stack&code=PYBwLglsB2AEC8sDeAoWsCGAnCGBcya6sAJgKYDGGANgUrAM4AWwA7gWFgK5kA0plGgwIBtegwCeAWwBGwWrADknXNADm1MotgBffuOlyFiihCwVN2nQF1dRPUQAeAQUcRhyWGAkgyBExhgZGrAWBJWvEQSru50DugkgRgMZGB0ROgMwFzmfrAiGcT00BhSeYowWvwAbjQ8BACMupHERbAlZf5grMCKNXV5TTqF1vYtjGQ4ZB4Frait6N6-_jLYioXD6KM6ANxAA

One bar should be triangle the other circle, they are both triangle

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