Relation:Model
steps | instructions |
---|---|
Create relation | insert, data, read, import |
Process relation | select, project, rename, extend, parse |
Combine relations | join, union, difference, serialize, deserialize |
Prepare for output | order, limit |
Visualize | echo, format, print |
Export | write |
A relation is a sequence of the above instructions. The execution is linear with a stack machine, but each step is executed on a entire relation, therefore a double loop on row and columns.
The linear sequence is sometimes limiting. Relation provides therefore also structures to go further.
structure | use |
---|---|
function | define custom functions to extend the built in functions |
aggregator | define custom aggregators to extend the built in aggregators in project |
program | encapsulate and use parameters with a sequence of instructions |
set | define global values and assign inside functions, aggregators and programs |
if | conditional execution (only inside functions and aggregators) |
while | conditional loop (only inside functions and aggregators) |
dup, pop, swap | stack operators |