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Optimization

BIJECTIVE_FUNCTION​

bijective_function(Function f)
STABLE

Is function f bijective?

CODE_OPERATORS​

code_operators(Charstring fn) -> Bag of Integer
STABLE

No description.

CODE_TRAIL​

code_trail(Charstring fn) -> Vector
STABLE

No description.

code_trail(Function fno) -> Vector
STABLE

No description.

COSTHINT​

costhint(Function f, Charstring bpat, Object q) -> Function
STABLE

No description.

costhint(Charstring fn, Charstring bpat, Object h) -> Function
STABLE

Define cost model for function named fn and binding pattern bpat. 

 If `h` is a vector `[c,f]` it defines a constant cost `c` and fanout `f`.
 If `h` is a function it computes the cost and fanout

COSTHINTS​

costhints(Function fn)->Bag of (Charstring, Object)
STABLE

Get all cost models for binding patterns of function fn

ENABLE_TYPE_REWRITES​

enable_type_rewrites(Boolean flag)
STABLE

No description.

EXPORT_PLAN​

export_plan(Charstring fn, Charstring file) -> Bag of Function
STABLE

Write execution plans of resolvents of f into file

EXPORT_PLANS​

export_plans(Vector of Charstring fns, Charstring file) -> Bag of Function
STABLE

Write execution plans of resolvents of fns into file

FULLY_COMPILED​

fully_compiled(Vector of Charstring fns)
STABLE

Are all resolvents of fns fully compiled?

fully_compiled(Charstring fn)
STABLE

Are all resolvents of fn fully compiled into SLAP?

OPTMETHOD​

optmethod(Charstring m) -> Charstring r
STABLE

Choose query optimization method m for optimizing queries: 

 exhaustive: dynamic programming
 ranksort:   greedy ranking
 randomopt:  randomized optimization

PARTEVAL​

parteval(Charstring fn) -> Bag of Function
STABLE

Declare resolvents of function named fn to be partially evaluated

PLAN_COST​

plan_cost(Charstring fn)->Bag of (Real, Real)
STABLE

The estimated cost of executing resolvents of function named fn

plan_cost(Function f)->Bag of (Real, Real)
STABLE

The estimated cost of executing resolvents of function f

plan_cost(Charstring fn, Charstring bpat)->(Real, Real)
STABLE

The estimated cost of executing function named fn 

 for binding pattern `bpat`

PLAN_OPERATORS​

plan_operators(Charstring fn) -> Bag of Integer
STABLE

No description.

PLAN_TRAIL​

plan_trail(Function fno) -> Vector
STABLE

No description.

plan_trail(Charstring fn) -> Vector
STABLE

No description.

QUERY_PLAN_TRAIL​

query_plan_trail(Charstring query) -> Vector
STABLE

No description.

RECOMPILE​

recompile(Function f) -> Bag of Function
STABLE

Recompile resolvents of function f

recompile(Charstring fn) -> Bag of Function
STABLE

Recompile function named fn

REOPTIMIZE​

reoptimize(Function f) -> Bag of Function
STABLE

Reoptimize execution plan of function f, including all subqueries

reoptimize(Charstring fn) -> Bag of Function
STABLE

Reoptimize execution plan of function named fn, 

  including all subqueries

UNCACHE_COSTS​

uncache_costs( ) -> Integer
STABLE

Uncache costs of all functions

UNPARTEVAL​

unparteval(Charstring fn) -> Bag of Function
STABLE

Make resolvents of function named fn not be partially evaluated