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Concat expressions

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   post_id post tag
1 1 This is post 1 blue-1
2 1 This is post 1 green-3
   post_id post all_tags
1 1 This is post 1 blue-1, green-3
   post_id post all_tags_with_ids
1 1 This is post 1 blue-1 [1], green-3 [3]