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Through a Table, Sparsely | Hacker News Reader
Through a Table, Sparsely
blog.memsql.com
32 points
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nikita
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minimax
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Can you put an index on an optional column (or a function of an optional column)? Also, nice title.
aristus
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You can, by hoisting it up as a calculated column and indexing on that. We have support for sparse indexes as well.
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