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106 lines
2.1 KiB
Markdown
106 lines
2.1 KiB
Markdown
# Structure of the project
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* Parser
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* Query AST
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* Typing support
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* Logical plan/optimizers
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* Physical plan/optimizers
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* Runtime representation (values)
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* DB interaction/(de)serialization
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* Evaluator/interpreter/VM
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* Plan executors
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```
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{
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*id: id,
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name: d.name[0]
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}
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```
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```
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$name
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${name:?Int}
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```
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```
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where a: b.id == c.id
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trail
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```
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```
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select ...
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view X = select {} : Vertex
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let z = select {} : Vertex
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```
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```
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from(e:Employee)
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.where(e.id > 10)
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.select(x: {id: e.id, name: e.first_name ++ e.last_name})
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.skip(10)
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.take(20);
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```
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```
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from(e:Employee-[hj:HasJob]->j:Job)
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.where(e.id == 20)
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.select({..j});
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query DoThis(x:Int, y:Any) {
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return select(-[v:V]->)
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.where(v.id >= x, v.data == y);
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}
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```
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```
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query DoThat(r:Rel(*id: Int)) {
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...
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}
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```
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```
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global query XXX() {
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...
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}
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```
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# Operations on relations
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Operations
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* `from(...rels)`, can use chain notation
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* `join(left, right, ...conds)`
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* `left_join(left, right, ...conds)`, similarly for `right_join`, `outer_join`)
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* `intersect(...rels)`, similarly for `union`
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* `diff(left, right)`, similarly for `sym_diff`
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* `select(rel, binding: {..})`
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* `where(rel, ..conds)`
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* `take(rel, n)`
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* `skip(rel, n)`
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* `sort(rel, expr1, expr2: sort_dir)`
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* `group(rel, binding: {*key1: expr1, val1: expr2})`
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* `window(rel, ...)`, maybe various flavours
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* `freeze(rel)`, disables structural optimization
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* `materialize(rel)`, forces materialization
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* `merge(...rels)`, concat data cols, key cols must be the same, if names clash last wins. Same for `left_merge`, `right_merge`, `outer_merge`
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* `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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* `values(data, ?Table)`
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* `nested_values(data, ?Table).extract(Table)`
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* `as(rel, Table)`
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* `as_keyed_by(rel, Table)`
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* `update(rel, Table)`
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* `delete(rel, Table)`
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* `insert(rel, Table)`
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* `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()` |