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75 lines
1.9 KiB
Markdown
75 lines
1.9 KiB
Markdown
# Operations on relations
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Operations
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* [x] `from(...rels)`, can use chain notation
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* [x] `left_join(left, right, ...conds)`, similarly for `right_join`, `outer_join`)
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* [x] `concat(...rels)`
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* [x] `intersect(...rels)`, similarly for `union`
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* [x] `diff(left, right)`, similarly for `sym_diff`
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* [x] `select(rel, binding: {..})`
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* [x] `where(rel, ..conds)`
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* [x] `take(rel, n)`
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* [x] `skip(rel, n)`
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* [x] `sort(rel, expr1, expr2: sort_dir)`
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* [x] `group(rel, binding: {*key1: expr1, val1: expr2}, *ordering)` may order elements within groups
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* [x] `walk(pattern, ...conds, ...bindings)`
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* [ ] `walk_repeat(pattern, ...conds, ...bindings)` every element contains additional `_iter` and `_visited` fields
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* [x] `values(data, ?Table)`
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* [x] `nested_values(data, ?Table).extract(Table)`
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* [x] `update(rel, Table)`
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* [x] `delete(rel, Table)`
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* [x] `insert(rel, Table)`
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* [x] `upsert(rel, Table)`
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Helpers
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* `print(rel)`
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* `print_schema(rel)`
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* `print_plan(rel)`
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* `print_optimized(rel)`
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Aggregation
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* Aggregation functions should implement `.step()` and `.result()`
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Differentiation
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* function calls use parentheses, names start with lowercase letters or "_"
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* aggregation calls are the same as function calls except that square brackets are used instead
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* query calls are the same as function calls except that query names start with upper case or "#"
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Others
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* [ ] assoc magic better work
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* [ ] language within query
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* [ ] constraints and indices
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* [ ] datetime and array types
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* [ ] GUI and TUI
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* [ ] query optimization
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* [ ] regex as a value type
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```
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Walk(a:A-[e:E]->b:B,
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a => (a.id == 10),
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e => (e.id < 20, count[] <= 1, rand() => asc),
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b: {
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...b,
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...e,
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...a
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})
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Chain(a:A-[p:Path]->b:B,
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_next => _hops < 10)
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```
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Walk, ChainWalk, MaxChainWalk, TreeWalk, ChainWalkSegments
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```
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Walk(p:Person - [:Follows> ~ :<Follows | :Likes>].. - p2:Person)
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```
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```
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sum()(x.id)
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``` |