cloud-fan commented on a change in pull request #26231: [SPARK-29572][SQL] add
v1 read fallback API in DS v2
URL: https://github.com/apache/spark/pull/26231#discussion_r367230956
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/DataSourceV2Strategy.scala
##########
@@ -19,40 +19,72 @@ package org.apache.spark.sql.execution.datasources.v2
import scala.collection.JavaConverters._
-import org.apache.spark.sql.{AnalysisException, Strategy}
+import org.apache.spark.sql.{AnalysisException, SparkSession, Strategy}
import org.apache.spark.sql.catalyst.analysis.{ResolvedNamespace,
ResolvedTable}
-import org.apache.spark.sql.catalyst.expressions.{And, PredicateHelper,
SubqueryExpression}
+import org.apache.spark.sql.catalyst.expressions.{And, Expression,
NamedExpression, PredicateHelper, SubqueryExpression}
import org.apache.spark.sql.catalyst.planning.PhysicalOperation
import org.apache.spark.sql.catalyst.plans.logical.{AlterNamespaceSetLocation,
AlterNamespaceSetOwner, AlterNamespaceSetProperties, AlterTable, AppendData,
CommentOnNamespace, CommentOnTable, CreateNamespace, CreateTableAsSelect,
CreateV2Table, DeleteFromTable, DescribeNamespace, DescribeTable,
DropNamespace, DropTable, LogicalPlan, OverwriteByExpression,
OverwritePartitionsDynamic, RefreshTable, RenameTable, Repartition,
ReplaceTable, ReplaceTableAsSelect, SetCatalogAndNamespace,
ShowCurrentNamespace, ShowNamespaces, ShowTableProperties, ShowTables}
-import org.apache.spark.sql.connector.catalog.{Identifier,
StagingTableCatalog, SupportsNamespaces, TableCapability, TableCatalog,
TableChange}
+import org.apache.spark.sql.connector.catalog.{StagingTableCatalog,
SupportsNamespaces, TableCapability, TableCatalog, TableChange}
+import org.apache.spark.sql.connector.read.V1Scan
import org.apache.spark.sql.connector.read.streaming.{ContinuousStream,
MicroBatchStream}
-import org.apache.spark.sql.execution.{FilterExec, ProjectExec, SparkPlan}
+import org.apache.spark.sql.execution.{FilterExec, LeafExecNode, ProjectExec,
RowDataSourceScanExec, SparkPlan}
import org.apache.spark.sql.execution.datasources.DataSourceStrategy
import
org.apache.spark.sql.execution.streaming.continuous.{ContinuousCoalesceExec,
WriteToContinuousDataSource, WriteToContinuousDataSourceExec}
+import org.apache.spark.sql.sources.{BaseRelation, TableScan}
import org.apache.spark.sql.util.CaseInsensitiveStringMap
-object DataSourceV2Strategy extends Strategy with PredicateHelper {
+class DataSourceV2Strategy(session: SparkSession) extends Strategy with
PredicateHelper {
import DataSourceV2Implicits._
import org.apache.spark.sql.connector.catalog.CatalogV2Implicits._
+ private def withProjectAndFilter(
+ project: Seq[NamedExpression],
+ filters: Seq[Expression],
+ scan: LeafExecNode,
+ needsUnsafeConversion: Boolean): SparkPlan = {
+ val filterCondition = filters.reduceLeftOption(And)
+ val withFilter = filterCondition.map(FilterExec(_, scan)).getOrElse(scan)
+
+ if (withFilter.output != project || needsUnsafeConversion) {
+ ProjectExec(project, withFilter)
+ } else {
+ withFilter
+ }
+ }
+
override def apply(plan: LogicalPlan): Seq[SparkPlan] = plan match {
+ case PhysicalOperation(project, filters,
+ relation @ DataSourceV2ScanRelation(_, v1Scan: V1Scan, output)) =>
+ val pushedFilters =
relation.getTagValue(V2ScanRelationPushDown.PUSHED_FILTERS_TAG)
+ .getOrElse(Seq.empty)
+ val v1Relation = v1Scan.toV1TableScan[BaseRelation with
TableScan](session.sqlContext)
+ if (v1Relation.schema != v1Scan.readSchema()) {
+ throw new IllegalArgumentException(
+ "The fallback v1 relation reports inconsistent schema:\n" +
+ "Schema of v2 scan: " + v1Scan.readSchema() + "\n" +
+ "Schema of v1 relation: " + v1Relation.schema)
+ }
+ val rdd = v1Relation.buildScan()
+ val unsafeRowRDD = DataSourceStrategy.toCatalystRDD(v1Relation, output,
rdd)
+ val originalOutputNames = relation.table.schema().map(_.name)
+ val requiredColumnsIndex =
output.map(_.name).map(originalOutputNames.indexOf)
+ val dsScan = RowDataSourceScanExec(
+ output,
+ requiredColumnsIndex,
+ pushedFilters.toSet,
Review comment:
Yes it should be the entire set of filters, but it's not a big deal.
`RowDataSourceScanExec.filters` is only used in `toString`, to let people know
which filters are pushed but not accepted by the source.
Anyway we can retain the full filter set like the pushed filters, I'll fix
it.
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