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Document upgrade query predicates

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Chuan-kai Lin
2023-03-17 11:06:39 -07:00
parent dce81cf0ae
commit 4dd7dbc73b
1 changed files with 9 additions and 0 deletions
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docs/prepare-db-upgrade.md
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@@ -58,6 +58,15 @@ extended.rel: reorder input.rel (int id, string name, int parent) id name parent
// should be placed in the upgrade directory. It should avoid using the default
// QLL library, and will run in the context of the *old* dbscheme.
relationname.rel: run relationname.qlo
// Create relationname.rel by running the query predicate 'predicatename' in
// relationname.qlo and writing the query results as a .rel file. This command
// expects the upgrade relation to be a query predicate, which has the advantage
// of allowing multiple upgrade relations to appear in the same .ql file as
// multiple query predicates. The query file should be named relationname.ql and
// should be placed in the upgrade directory. It should avoid using the default
// QLL library, and will run in the context of the *old* dbscheme.
relationname.rel: run relationname.qlo predicatename
```
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