org.apache.spark.sql.execution.DataSourceScanExec.scala Maven / Gradle / Ivy
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package org.apache.spark.sql.execution
import java.util.concurrent.TimeUnit._
import scala.collection.mutable.HashMap
import org.apache.commons.lang3.StringUtils
import org.apache.hadoop.fs.Path
import org.apache.spark.rdd.RDD
import org.apache.spark.sql.catalyst.{InternalRow, TableIdentifier}
import org.apache.spark.sql.catalyst.catalog.BucketSpec
import org.apache.spark.sql.catalyst.expressions._
import org.apache.spark.sql.catalyst.plans.QueryPlan
import org.apache.spark.sql.catalyst.plans.physical.{HashPartitioning, Partitioning, UnknownPartitioning}
import org.apache.spark.sql.catalyst.util.truncatedString
import org.apache.spark.sql.connector.expressions.aggregate.Aggregation
import org.apache.spark.sql.execution.datasources._
import org.apache.spark.sql.execution.datasources.parquet.{ParquetFileFormat => ParquetSource}
import org.apache.spark.sql.execution.metric.{SQLMetric, SQLMetrics}
import org.apache.spark.sql.internal.SQLConf
import org.apache.spark.sql.sources.{BaseRelation, Filter}
import org.apache.spark.sql.types.StructType
import org.apache.spark.sql.vectorized.ColumnarBatch
import org.apache.spark.util.Utils
import org.apache.spark.util.collection.BitSet
trait DataSourceScanExec extends LeafExecNode {
def relation: BaseRelation
def tableIdentifier: Option[TableIdentifier]
protected val nodeNamePrefix: String = ""
override val nodeName: String = {
s"Scan $relation ${tableIdentifier.map(_.unquotedString).getOrElse("")}"
}
// Metadata that describes more details of this scan.
protected def metadata: Map[String, String]
protected val maxMetadataValueLength = conf.maxMetadataStringLength
override def simpleString(maxFields: Int): String = {
val metadataEntries = metadata.toSeq.sorted.map {
case (key, value) =>
key + ": " + StringUtils.abbreviate(redact(value), maxMetadataValueLength)
}
val metadataStr = truncatedString(metadataEntries, " ", ", ", "", maxFields)
redact(
s"$nodeNamePrefix$nodeName${truncatedString(output, "[", ",", "]", maxFields)}$metadataStr")
}
override def verboseStringWithOperatorId(): String = {
val metadataStr = metadata.toSeq.sorted.filterNot {
case (_, value) if (value.isEmpty || value.equals("[]")) => true
case (key, _) if (key.equals("DataFilters") || key.equals("Format")) => true
case (_, _) => false
}.map {
case (key, value) => s"$key: ${redact(value)}"
}
s"""
|$formattedNodeName
|${ExplainUtils.generateFieldString("Output", output)}
|${metadataStr.mkString("\n")}
|""".stripMargin
}
/**
* Shorthand for calling redactString() without specifying redacting rules
*/
protected def redact(text: String): String = {
Utils.redact(conf.stringRedactionPattern, text)
}
/**
* The data being read in. This is to provide input to the tests in a way compatible with
* [[InputRDDCodegen]] which all implementations used to extend.
*/
def inputRDDs(): Seq[RDD[InternalRow]]
}
/** Physical plan node for scanning data from a relation. */
case class RowDataSourceScanExec(
output: Seq[Attribute],
requiredSchema: StructType,
filters: Set[Filter],
handledFilters: Set[Filter],
aggregation: Option[Aggregation],
rdd: RDD[InternalRow],
@transient relation: BaseRelation,
tableIdentifier: Option[TableIdentifier])
extends DataSourceScanExec with InputRDDCodegen {
override lazy val metrics =
Map("numOutputRows" -> SQLMetrics.createMetric(sparkContext, "number of output rows"))
protected override def doExecute(): RDD[InternalRow] = {
val numOutputRows = longMetric("numOutputRows")
rdd.mapPartitionsWithIndexInternal { (index, iter) =>
val proj = UnsafeProjection.create(schema)
proj.initialize(index)
iter.map( r => {
numOutputRows += 1
proj(r)
})
}
}
// Input can be InternalRow, has to be turned into UnsafeRows.
override protected val createUnsafeProjection: Boolean = true
override def inputRDD: RDD[InternalRow] = rdd
override val metadata: Map[String, String] = {
def seqToString(seq: Seq[Any]): String = seq.mkString("[", ", ", "]")
val (aggString, groupByString) = if (aggregation.nonEmpty) {
(seqToString(aggregation.get.aggregateExpressions),
seqToString(aggregation.get.groupByColumns))
} else {
("[]", "[]")
}
val markedFilters = if (filters.nonEmpty) {
for (filter <- filters) yield {
if (handledFilters.contains(filter)) s"*$filter" else s"$filter"
}
} else {
handledFilters
}
Map(
"ReadSchema" -> requiredSchema.catalogString,
"PushedFilters" -> seqToString(markedFilters.toSeq),
"PushedAggregates" -> aggString,
"PushedGroupby" -> groupByString)
}
// Don't care about `rdd` and `tableIdentifier` when canonicalizing.
override def doCanonicalize(): SparkPlan =
copy(
output.map(QueryPlan.normalizeExpressions(_, output)),
rdd = null,
tableIdentifier = None)
}
/**
* Physical plan node for scanning data from HadoopFsRelations.
*
* @param relation The file-based relation to scan.
* @param output Output attributes of the scan, including data attributes and partition attributes.
* @param requiredSchema Required schema of the underlying relation, excluding partition columns.
* @param partitionFilters Predicates to use for partition pruning.
* @param optionalBucketSet Bucket ids for bucket pruning.
* @param optionalNumCoalescedBuckets Number of coalesced buckets.
* @param dataFilters Filters on non-partition columns.
* @param tableIdentifier Identifier for the table in the metastore.
* @param disableBucketedScan Disable bucketed scan based on physical query plan, see rule
* [[DisableUnnecessaryBucketedScan]] for details.
*/
case class FileSourceScanExec(
@transient relation: HadoopFsRelation,
output: Seq[Attribute],
requiredSchema: StructType,
partitionFilters: Seq[Expression],
optionalBucketSet: Option[BitSet],
optionalNumCoalescedBuckets: Option[Int],
dataFilters: Seq[Expression],
tableIdentifier: Option[TableIdentifier],
disableBucketedScan: Boolean = false)
extends DataSourceScanExec {
// Note that some vals referring the file-based relation are lazy intentionally
// so that this plan can be canonicalized on executor side too. See SPARK-23731.
override lazy val supportsColumnar: Boolean = {
relation.fileFormat.supportBatch(relation.sparkSession, schema)
}
private lazy val needsUnsafeRowConversion: Boolean = {
if (relation.fileFormat.isInstanceOf[ParquetSource]) {
conf.parquetVectorizedReaderEnabled
} else {
false
}
}
override def vectorTypes: Option[Seq[String]] =
relation.fileFormat.vectorTypes(
requiredSchema = requiredSchema,
partitionSchema = relation.partitionSchema,
relation.sparkSession.sessionState.conf)
private lazy val driverMetrics: HashMap[String, Long] = HashMap.empty
/**
* Send the driver-side metrics. Before calling this function, selectedPartitions has
* been initialized. See SPARK-26327 for more details.
*/
private def sendDriverMetrics(): Unit = {
driverMetrics.foreach(e => metrics(e._1).add(e._2))
val executionId = sparkContext.getLocalProperty(SQLExecution.EXECUTION_ID_KEY)
SQLMetrics.postDriverMetricUpdates(sparkContext, executionId,
metrics.filter(e => driverMetrics.contains(e._1)).values.toSeq)
}
private def isDynamicPruningFilter(e: Expression): Boolean =
e.find(_.isInstanceOf[PlanExpression[_]]).isDefined
@transient lazy val selectedPartitions: Array[PartitionDirectory] = {
val optimizerMetadataTimeNs = relation.location.metadataOpsTimeNs.getOrElse(0L)
val startTime = System.nanoTime()
val ret =
relation.location.listFiles(
partitionFilters.filterNot(isDynamicPruningFilter), dataFilters)
setFilesNumAndSizeMetric(ret, true)
val timeTakenMs = NANOSECONDS.toMillis(
(System.nanoTime() - startTime) + optimizerMetadataTimeNs)
driverMetrics("metadataTime") = timeTakenMs
ret
}.toArray
// We can only determine the actual partitions at runtime when a dynamic partition filter is
// present. This is because such a filter relies on information that is only available at run
// time (for instance the keys used in the other side of a join).
@transient private lazy val dynamicallySelectedPartitions: Array[PartitionDirectory] = {
val dynamicPartitionFilters = partitionFilters.filter(isDynamicPruningFilter)
if (dynamicPartitionFilters.nonEmpty) {
val startTime = System.nanoTime()
// call the file index for the files matching all filters except dynamic partition filters
val predicate = dynamicPartitionFilters.reduce(And)
val partitionColumns = relation.partitionSchema
val boundPredicate = Predicate.create(predicate.transform {
case a: AttributeReference =>
val index = partitionColumns.indexWhere(a.name == _.name)
BoundReference(index, partitionColumns(index).dataType, nullable = true)
}, Nil)
val ret = selectedPartitions.filter(p => boundPredicate.eval(p.values))
setFilesNumAndSizeMetric(ret, false)
val timeTakenMs = (System.nanoTime() - startTime) / 1000 / 1000
driverMetrics("pruningTime") = timeTakenMs
ret
} else {
selectedPartitions
}
}
/**
* [[partitionFilters]] can contain subqueries whose results are available only at runtime so
* accessing [[selectedPartitions]] should be guarded by this method during planning
*/
private def hasPartitionsAvailableAtRunTime: Boolean = {
partitionFilters.exists(ExecSubqueryExpression.hasSubquery)
}
private def toAttribute(colName: String): Option[Attribute] =
output.find(_.name == colName)
// exposed for testing
lazy val bucketedScan: Boolean = {
if (relation.sparkSession.sessionState.conf.bucketingEnabled && relation.bucketSpec.isDefined
&& !disableBucketedScan) {
val spec = relation.bucketSpec.get
val bucketColumns = spec.bucketColumnNames.flatMap(n => toAttribute(n))
bucketColumns.size == spec.bucketColumnNames.size
} else {
false
}
}
override lazy val (outputPartitioning, outputOrdering): (Partitioning, Seq[SortOrder]) = {
if (bucketedScan) {
// For bucketed columns:
// -----------------------
// `HashPartitioning` would be used only when:
// 1. ALL the bucketing columns are being read from the table
//
// For sorted columns:
// ---------------------
// Sort ordering should be used when ALL these criteria's match:
// 1. `HashPartitioning` is being used
// 2. A prefix (or all) of the sort columns are being read from the table.
//
// Sort ordering would be over the prefix subset of `sort columns` being read
// from the table.
// e.g.
// Assume (col0, col2, col3) are the columns read from the table
// If sort columns are (col0, col1), then sort ordering would be considered as (col0)
// If sort columns are (col1, col0), then sort ordering would be empty as per rule #2
// above
val spec = relation.bucketSpec.get
val bucketColumns = spec.bucketColumnNames.flatMap(n => toAttribute(n))
val numPartitions = optionalNumCoalescedBuckets.getOrElse(spec.numBuckets)
val partitioning = HashPartitioning(bucketColumns, numPartitions)
val sortColumns =
spec.sortColumnNames.map(x => toAttribute(x)).takeWhile(x => x.isDefined).map(_.get)
val shouldCalculateSortOrder =
conf.getConf(SQLConf.LEGACY_BUCKETED_TABLE_SCAN_OUTPUT_ORDERING) &&
sortColumns.nonEmpty &&
!hasPartitionsAvailableAtRunTime
val sortOrder = if (shouldCalculateSortOrder) {
// In case of bucketing, its possible to have multiple files belonging to the
// same bucket in a given relation. Each of these files are locally sorted
// but those files combined together are not globally sorted. Given that,
// the RDD partition will not be sorted even if the relation has sort columns set
// Current solution is to check if all the buckets have a single file in it
val files = selectedPartitions.flatMap(partition => partition.files)
val bucketToFilesGrouping =
files.map(_.getPath.getName).groupBy(file => BucketingUtils.getBucketId(file))
val singleFilePartitions = bucketToFilesGrouping.forall(p => p._2.length <= 1)
// TODO SPARK-24528 Sort order is currently ignored if buckets are coalesced.
if (singleFilePartitions && optionalNumCoalescedBuckets.isEmpty) {
// TODO Currently Spark does not support writing columns sorting in descending order
// so using Ascending order. This can be fixed in future
sortColumns.map(attribute => SortOrder(attribute, Ascending))
} else {
Nil
}
} else {
Nil
}
(partitioning, sortOrder)
} else {
(UnknownPartitioning(0), Nil)
}
}
@transient
private lazy val pushedDownFilters = {
val supportNestedPredicatePushdown = DataSourceUtils.supportNestedPredicatePushdown(relation)
dataFilters.flatMap(DataSourceStrategy.translateFilter(_, supportNestedPredicatePushdown))
}
override lazy val metadata: Map[String, String] = {
def seqToString(seq: Seq[Any]) = seq.mkString("[", ", ", "]")
val location = relation.location
val locationDesc =
location.getClass.getSimpleName +
Utils.buildLocationMetadata(location.rootPaths, maxMetadataValueLength)
val metadata =
Map(
"Format" -> relation.fileFormat.toString,
"ReadSchema" -> requiredSchema.catalogString,
"Batched" -> supportsColumnar.toString,
"PartitionFilters" -> seqToString(partitionFilters),
"PushedFilters" -> seqToString(pushedDownFilters),
"DataFilters" -> seqToString(dataFilters),
"Location" -> locationDesc)
// TODO(SPARK-32986): Add bucketed scan info in explain output of FileSourceScanExec
if (bucketedScan) {
relation.bucketSpec.map { spec =>
val numSelectedBuckets = optionalBucketSet.map { b =>
b.cardinality()
} getOrElse {
spec.numBuckets
}
metadata + ("SelectedBucketsCount" ->
(s"$numSelectedBuckets out of ${spec.numBuckets}" +
optionalNumCoalescedBuckets.map { b => s" (Coalesced to $b)"}.getOrElse("")))
} getOrElse {
metadata
}
} else {
metadata
}
}
override def verboseStringWithOperatorId(): String = {
val metadataStr = metadata.toSeq.sorted.filterNot {
case (_, value) if (value.isEmpty || value.equals("[]")) => true
case (key, _) if (key.equals("DataFilters") || key.equals("Format")) => true
case (_, _) => false
}.map {
case (key, _) if (key.equals("Location")) =>
val location = relation.location
val numPaths = location.rootPaths.length
val abbreviatedLocation = if (numPaths <= 1) {
location.rootPaths.mkString("[", ", ", "]")
} else {
"[" + location.rootPaths.head + s", ... ${numPaths - 1} entries]"
}
s"$key: ${location.getClass.getSimpleName} ${redact(abbreviatedLocation)}"
case (key, value) => s"$key: ${redact(value)}"
}
s"""
|$formattedNodeName
|${ExplainUtils.generateFieldString("Output", output)}
|${metadataStr.mkString("\n")}
|""".stripMargin
}
lazy val inputRDD: RDD[InternalRow] = {
val readFile: (PartitionedFile) => Iterator[InternalRow] =
relation.fileFormat.buildReaderWithPartitionValues(
sparkSession = relation.sparkSession,
dataSchema = relation.dataSchema,
partitionSchema = relation.partitionSchema,
requiredSchema = requiredSchema,
filters = pushedDownFilters,
options = relation.options,
hadoopConf = relation.sparkSession.sessionState.newHadoopConfWithOptions(relation.options))
val readRDD = if (bucketedScan) {
createBucketedReadRDD(relation.bucketSpec.get, readFile, dynamicallySelectedPartitions,
relation)
} else {
createReadRDD(readFile, dynamicallySelectedPartitions, relation)
}
sendDriverMetrics()
readRDD
}
override def inputRDDs(): Seq[RDD[InternalRow]] = {
inputRDD :: Nil
}
/** SQL metrics generated only for scans using dynamic partition pruning. */
private lazy val staticMetrics = if (partitionFilters.exists(isDynamicPruningFilter)) {
Map("staticFilesNum" -> SQLMetrics.createMetric(sparkContext, "static number of files read"),
"staticFilesSize" -> SQLMetrics.createSizeMetric(sparkContext, "static size of files read"))
} else {
Map.empty[String, SQLMetric]
}
/** Helper for computing total number and size of files in selected partitions. */
private def setFilesNumAndSizeMetric(
partitions: Seq[PartitionDirectory],
static: Boolean): Unit = {
val filesNum = partitions.map(_.files.size.toLong).sum
val filesSize = partitions.map(_.files.map(_.getLen).sum).sum
if (!static || !partitionFilters.exists(isDynamicPruningFilter)) {
driverMetrics("numFiles") = filesNum
driverMetrics("filesSize") = filesSize
} else {
driverMetrics("staticFilesNum") = filesNum
driverMetrics("staticFilesSize") = filesSize
}
if (relation.partitionSchemaOption.isDefined) {
driverMetrics("numPartitions") = partitions.length
}
}
override lazy val metrics = Map(
"numOutputRows" -> SQLMetrics.createMetric(sparkContext, "number of output rows"),
"numFiles" -> SQLMetrics.createMetric(sparkContext, "number of files read"),
"metadataTime" -> SQLMetrics.createTimingMetric(sparkContext, "metadata time"),
"filesSize" -> SQLMetrics.createSizeMetric(sparkContext, "size of files read")
) ++ {
// Tracking scan time has overhead, we can't afford to do it for each row, and can only do
// it for each batch.
if (supportsColumnar) {
Some("scanTime" -> SQLMetrics.createTimingMetric(sparkContext, "scan time"))
} else {
None
}
} ++ {
if (relation.partitionSchemaOption.isDefined) {
Map(
"numPartitions" -> SQLMetrics.createMetric(sparkContext, "number of partitions read"),
"pruningTime" ->
SQLMetrics.createTimingMetric(sparkContext, "dynamic partition pruning time"))
} else {
Map.empty[String, SQLMetric]
}
} ++ staticMetrics
protected override def doExecute(): RDD[InternalRow] = {
val numOutputRows = longMetric("numOutputRows")
if (needsUnsafeRowConversion) {
inputRDD.mapPartitionsWithIndexInternal { (index, iter) =>
val toUnsafe = UnsafeProjection.create(schema)
toUnsafe.initialize(index)
iter.map { row =>
numOutputRows += 1
toUnsafe(row)
}
}
} else {
inputRDD.mapPartitionsInternal { iter =>
iter.map { row =>
numOutputRows += 1
row
}
}
}
}
protected override def doExecuteColumnar(): RDD[ColumnarBatch] = {
val numOutputRows = longMetric("numOutputRows")
val scanTime = longMetric("scanTime")
inputRDD.asInstanceOf[RDD[ColumnarBatch]].mapPartitionsInternal { batches =>
new Iterator[ColumnarBatch] {
override def hasNext: Boolean = {
// The `FileScanRDD` returns an iterator which scans the file during the `hasNext` call.
val startNs = System.nanoTime()
val res = batches.hasNext
scanTime += NANOSECONDS.toMillis(System.nanoTime() - startNs)
res
}
override def next(): ColumnarBatch = {
val batch = batches.next()
numOutputRows += batch.numRows()
batch
}
}
}
}
override val nodeNamePrefix: String = "File"
/**
* Create an RDD for bucketed reads.
* The non-bucketed variant of this function is [[createReadRDD]].
*
* The algorithm is pretty simple: each RDD partition being returned should include all the files
* with the same bucket id from all the given Hive partitions.
*
* @param bucketSpec the bucketing spec.
* @param readFile a function to read each (part of a) file.
* @param selectedPartitions Hive-style partition that are part of the read.
* @param fsRelation [[HadoopFsRelation]] associated with the read.
*/
private def createBucketedReadRDD(
bucketSpec: BucketSpec,
readFile: (PartitionedFile) => Iterator[InternalRow],
selectedPartitions: Array[PartitionDirectory],
fsRelation: HadoopFsRelation): RDD[InternalRow] = {
logInfo(s"Planning with ${bucketSpec.numBuckets} buckets")
val filesGroupedToBuckets =
selectedPartitions.flatMap { p =>
p.files.map { f =>
PartitionedFileUtil.getPartitionedFile(f, f.getPath, p.values)
}
}.groupBy { f =>
BucketingUtils
.getBucketId(new Path(f.filePath).getName)
.getOrElse(throw new IllegalStateException(s"Invalid bucket file ${f.filePath}"))
}
val prunedFilesGroupedToBuckets = if (optionalBucketSet.isDefined) {
val bucketSet = optionalBucketSet.get
filesGroupedToBuckets.filter {
f => bucketSet.get(f._1)
}
} else {
filesGroupedToBuckets
}
val filePartitions = optionalNumCoalescedBuckets.map { numCoalescedBuckets =>
logInfo(s"Coalescing to ${numCoalescedBuckets} buckets")
val coalescedBuckets = prunedFilesGroupedToBuckets.groupBy(_._1 % numCoalescedBuckets)
Seq.tabulate(numCoalescedBuckets) { bucketId =>
val partitionedFiles = coalescedBuckets.get(bucketId).map {
_.values.flatten.toArray
}.getOrElse(Array.empty)
FilePartition(bucketId, partitionedFiles)
}
}.getOrElse {
Seq.tabulate(bucketSpec.numBuckets) { bucketId =>
FilePartition(bucketId, prunedFilesGroupedToBuckets.getOrElse(bucketId, Array.empty))
}
}
new FileScanRDD(fsRelation.sparkSession, readFile, filePartitions)
}
/**
* Create an RDD for non-bucketed reads.
* The bucketed variant of this function is [[createBucketedReadRDD]].
*
* @param readFile a function to read each (part of a) file.
* @param selectedPartitions Hive-style partition that are part of the read.
* @param fsRelation [[HadoopFsRelation]] associated with the read.
*/
private def createReadRDD(
readFile: (PartitionedFile) => Iterator[InternalRow],
selectedPartitions: Array[PartitionDirectory],
fsRelation: HadoopFsRelation): RDD[InternalRow] = {
val openCostInBytes = fsRelation.sparkSession.sessionState.conf.filesOpenCostInBytes
val maxSplitBytes =
FilePartition.maxSplitBytes(fsRelation.sparkSession, selectedPartitions)
logInfo(s"Planning scan with bin packing, max size: $maxSplitBytes bytes, " +
s"open cost is considered as scanning $openCostInBytes bytes.")
// Filter files with bucket pruning if possible
val bucketingEnabled = fsRelation.sparkSession.sessionState.conf.bucketingEnabled
val shouldProcess: Path => Boolean = optionalBucketSet match {
case Some(bucketSet) if bucketingEnabled =>
// Do not prune the file if bucket file name is invalid
filePath => BucketingUtils.getBucketId(filePath.getName).forall(bucketSet.get)
case _ =>
_ => true
}
val splitFiles = selectedPartitions.flatMap { partition =>
partition.files.flatMap { file =>
// getPath() is very expensive so we only want to call it once in this block:
val filePath = file.getPath
if (shouldProcess(filePath)) {
val isSplitable = relation.fileFormat.isSplitable(
relation.sparkSession, relation.options, filePath)
PartitionedFileUtil.splitFiles(
sparkSession = relation.sparkSession,
file = file,
filePath = filePath,
isSplitable = isSplitable,
maxSplitBytes = maxSplitBytes,
partitionValues = partition.values
)
} else {
Seq.empty
}
}
}.sortBy(_.length)(implicitly[Ordering[Long]].reverse)
val partitions =
FilePartition.getFilePartitions(relation.sparkSession, splitFiles, maxSplitBytes)
new FileScanRDD(fsRelation.sparkSession, readFile, partitions)
}
// Filters unused DynamicPruningExpression expressions - one which has been replaced
// with DynamicPruningExpression(Literal.TrueLiteral) during Physical Planning
private def filterUnusedDynamicPruningExpressions(
predicates: Seq[Expression]): Seq[Expression] = {
predicates.filterNot(_ == DynamicPruningExpression(Literal.TrueLiteral))
}
override def doCanonicalize(): FileSourceScanExec = {
FileSourceScanExec(
relation,
output.map(QueryPlan.normalizeExpressions(_, output)),
requiredSchema,
QueryPlan.normalizePredicates(
filterUnusedDynamicPruningExpressions(partitionFilters), output),
optionalBucketSet,
optionalNumCoalescedBuckets,
QueryPlan.normalizePredicates(dataFilters, output),
None,
disableBucketedScan)
}
}
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