[Feature](docs) Impl the function map_concat like spark #3220
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mrhhsg
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Dec 31, 2025
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说明和示例可以再详尽一些，多个参数不是同样的类型，返回什么类型
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zclllyybb
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Jan 17, 2026
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please also add docs for 4.0 version. and mention that since version 4.0.4 we support it.
zclllyybb
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Jan 31, 2026
docs/sql-manual/sql-functions/scalar-functions/map-functions/map-concat.md
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zclllyybb
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zclllyybb
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Feb 1, 2026
| 将多个 map 合并为一个 map。当合并具有不同键或值类型的 map 时，该函数会找到键和值的公共类型。 | ||
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| :::info Note | ||
| Supported since Apache Doris 4.0.4. |
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| ``` | ||
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| 包含 null 元素的 map 合并：null 元素通常会在合并结果中保留。 |
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不要使用这种模糊的说法，讲清楚究竟何时保留何时不保留
| - 当合并具有不同值类型的 map 时，函数会找到公共值类型 | ||
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| ## 返回值 | ||
| 返回一个合并后的 `MAP`，包含所有输入 map 中的键值对。 |
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