au.csiro.pathling.sql.SqlStrategy.scala Maven / Gradle / Ivy
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Interact with a FHIR terminology server from Spark.
/*
* Copyright 2022 Commonwealth Scientific and Industrial Research
* Organisation (CSIRO) ABN 41 687 119 230.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package au.csiro.pathling.sql
import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
import org.apache.spark.sql.execution.SparkPlan
import org.apache.spark.sql.{SparkSession, Strategy}
/**
* Custom spark SQL strategy with additional rules for custom Pathling operations.
*/
object SqlStrategy extends Strategy {
override def apply(plan: LogicalPlan): Seq[SparkPlan] = {
plan match {
case MapWithPartitionPreview(serializer, decoder, deserializer, preview, mapper, child) =>
MapWithPartitionPreviewExec(deserializer, decoder, serializer.value, preview, mapper,
planLater(child)) :: Nil
case _ => Nil
}
}
/**
* Injects SqlStrategy into a given Spark session.
*
* @param session Spark session to add SqlStrategy to
*/
def setup(session: SparkSession): Unit = {
if (!session.experimental.extraStrategies.contains(SqlStrategy)) {
session.experimental.extraStrategies = Seq(SqlStrategy) ++ session.experimental
.extraStrategies
}
}
}
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