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Map Type

duckdb.org

MAPs are similar to STRUCTs in that they are an ordered list of “entries” where a key maps to a value. However, MAPs do not need to have the same keys present for each row, and thus are suitable for other use cases. MAPs are useful when the schema is unknown beforehand or when the schema varies per row; their flexibility is a key differentiator. MAPs must have a single type for all keys, and a single type for all va…

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