xtdb.operator.ProjectionSpec.kt Maven / Gradle / Ivy

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An open source document database with bitemporal graph queries

There is a newer version: 2.0.0-beta4

package xtdb.operator

import clojure.lang.Symbol
import org.apache.arrow.memory.BufferAllocator
import xtdb.vector.RelationReader
import xtdb.vector.IVectorReader

interface ProjectionSpec {
    val columnName: Symbol
    val columnType: Any

    /**
     * @param params a single-row indirect relation containing the params for this invocation - maybe a view over a bigger param relation.
     */
    fun project(allocator: BufferAllocator, readRelation: RelationReader, schema: Map, params: RelationReader): IVectorReader
}