comunicaComunica Filter Pushdown Optimize Query Operation Actor
An Optimize Query Operation actor that pushes down filter expressions into the query plan as deep as possible.
This module is part of the Comunica framework, and should only be used by developers that want to build their own query engine.
Click here if you just want to query with Comunica.
Install
$ yarn add @comunica/actor-optimize-query-operation-filter-pushdownConfigure
After installing, this package can be added to your engine's configuration as follows:
{
"@context": [
...
"https://linkedsoftwaredependencies.org/bundles/npm/@comunica/actor-optimize-query-operation-filter-pushdown/^1.0.0/components/context.jsonld"
],
"actors": [
...
{
"@id": "urn:comunica:default:optimize-query-operation/actors#filter-pushdown",
"@type": "ActorOptimizeQueryOperationFilterPushdown"
}
]
}Config Parameters
aggressivePushdown: If filters should be pushed down as deep as possible. If false, filters will only be pushed down if the source(s) accept them, or if the filter is very selective. (defaults tofalse)maxIterations: The maximum number of full iterations across the query can be done for attempting to push down filters. (defaults to10)splitConjunctive: If conjunctive filters should be split into nested filters before applying filter pushdown. This can enable pushing down deeper. (defaults totrue)mergeConjunctive: If nested filters should be merged into conjunctive filters after applying filter pushdown. (defaults totrue)pushIntoLeftJoins: If filters should be pushed into left-joins. (defaults tofalse)pushEqualityIntoPatterns: If simple equality filters should be pushed into patterns and paths. This only applies to equality filters with terms that are not literals that have no canonical lexical form. (defaults totrue)