Documentation ¶
Index ¶
- type Relation
- func CartesianProduct(relations ...Relation) Relation
- func Join(relations ...Relation) Relation
- func Nest(s Relation, attrAttrs frozen.Map[string, frozen.Set[string]]) Relation
- func New(header []string, tuples ...[]any) Relation
- func Project(s Relation, attrs ...string) Relation
- func Unnest(s Relation, attr string) Relation
- type RelationBuilder
- type Tuple
Constants ¶
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Variables ¶
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Functions ¶
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Types ¶
type Relation ¶
func CartesianProduct ¶
func Join ¶
Join returns all {x, y, z} such that s has {x, y} and t has {y, z}. x, y and z represent sets of keys:
x: keys unique to maps in s y: keys common to maps in both z: keys unique to maps in t
It is assumed that all maps in s have the same keys and likewise for t.
func Nest ¶
Nest returns a relation with some attributes nested as subrelations.
Example:
input: _c_ _a__ |_1_|_10_| |_1_|_11_| |_2_|_13_| |_3_|_11_| |_4_|_14_| |_3_|_10_| |_4_|_13_| nest(input, {aa: {a}}): _c_ ___aa___ | 1 | _a__ | | | |_10_| | |___|_|_11_|_| | 2 | _a__ | |___|_|_13_|_| | 3 | _a__ | | | |_10_| | |___|_|_11_|_| | 4 | _a__ | | | |_13_| | |___|_|_14_|_|
type RelationBuilder ¶
type RelationBuilder = frozen.SetBuilder[Tuple]
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