Implement array_distinct function #7289
Description
Is your feature request related to a problem or challenge?
Summary
| Characteristic | Description |
|---|---|
| Function name: | array_distinct |
| Aliases: | list_distinct |
| Original function?: | No |
| Function Description: | DuckDB: Removes all duplicates and NULLs from a list. Does not preserve the original order. Azure DataBricks: Removes duplicate values from array. SQL Spark: Return distinct values from the array after removing duplicates. |
| Sources: | Concept DuckDB Azure Spark |
Examples:
D select array_distinct([1, 3, 2, 3, 1, 2, 4]);
┌──────────────────────────────────────────────────────┐
│ array_distinct(main.list_value(1, 3, 2, 3, 1, 2, 4)) │
│ int32[] │
├──────────────────────────────────────────────────────┤
│ [4, 2, 3, 1] │
└──────────────────────────────────────────────────────┘
D select array_distinct(['a', 'b', 'c', 'd']);
┌─────────────────────────────────────────────────────┐
│ array_distinct(main.list_value('a', 'b', 'c', 'd')) │
│ varchar[] │
├─────────────────────────────────────────────────────┤
│ [b, d, c, a] │
└─────────────────────────────────────────────────────┘
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Additional context
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