如何在 Tarantool 中通过二级索引创建 select？

Question

我创建了一个 space，其中包含两个索引 — 主索引和辅助索引：

box.schema.sequence.create('user_seq', { if_not_exists = true })
box.schema.space.create('user', {
    if_not_exists = true,
    format = {
        { name = 'id', type = 'unsigned'},
        { name = 'bio', type = 'string'}
    }
})
box.space.user:create_index('id', {
     sequence = 'user_seq',
     parts = {'id'}
})
box.space.user:create_index('bio', {
     parts = {'bio'},
     if_not_exists = true,
     unique = false
})

插入元组：

tarantool> box.space.user:insert({ box.sequence.user_seq:next(), 'other stuff'})
---
- [1, 'other stuff']
...

我试过这样搜索：

box.space.user:select({'other stuff'})

得到错误：

- error: 'Supplied key type of part 0 does not match index part type: expected unsigned'

我应该如何通过二级索引进行搜索？

Answer 1

文档说：

index.index-name is optional. If it is omitted, then the assumed index is the first (primary-key) index. Therefore, for the example above, box.space.tester:select({1}, {iterator = 'GT'}) would have returned the same two rows, via the ‘primary’ index.

明确使用二级索引：

tarantool> box.space.user.index.bio:select({'other stuff'})
---
- - [1, 'other stuff']
...

了解更多信息 in the documentation.

如何在 Tarantool 中通过二级索引创建 select？

How to make a select via secondary indexes in Tarantool?

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