HwangDongJun commented on code in PR #12833:
URL: https://github.com/apache/gluten/pull/12833#discussion_r4280078884
##########
gluten-iceberg/src/main/scala/org/apache/iceberg/spark/source/GlutenIcebergSourceUtil.scala:
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@@ -155,16 +155,69 @@ object GlutenIcebergSourceUtil {
metadataColumns
}
- def getFileFormat(sparkScan: Scan): ReadFileFormat = {
+ /**
+ * Derives both the file format and, optionally, the root path(s) actually
scanned from the
+ * planned Iceberg scan tasks in a single pass over
`getScanTasks(sparkScan)`.
+ *
+ * Root paths are derived from the real per-file (and, when present,
per-delete-file) paths rather
+ * than table metadata (Table.location() / write.data.path), since data
files can live at a
+ * location the static metadata does not reflect (e.g. after write.data.path
is changed without
+ * moving previously-written files). One representative path per distinct
scheme prefix is kept,
+ * since callers only need this to validate that the native filesystem
implementation supports
+ * every scheme in play, not to enumerate every file.
+ *
+ * NOTE: this deliberately reuses the same `getScanTasks(sparkScan)`
(Iceberg's own
+ * SparkPartitioningAwareScan#tasks()) that `getReadPartitionSchema` already
calls unconditionally
+ * from `doValidateInternal()`, not Spark's
BatchScanExecShim#filteredPartitions (which
+ * additionally calls SupportsRuntimeV2Filtering#filter() and
+ * Scan#toBatch().planInputPartitions(), and was the root cause of the DPP
regression from
+ * https://github.com/apache/gluten/issues/12712 when a prior revision of
this fix read paths from
+ * BatchScanExecTransformerBase#finalPartitions).
+ */
+ def getFileFormatAndRootPaths(
+ sparkScan: Scan,
+ collectRootPaths: Boolean): (ReadFileFormat, Seq[String]) = {
+ var fileFormat: ReadFileFormat = ReadFileFormat.UnknownFormat
+ // Built with plain mutable local collections that are never returned or
captured, then
+ // copied into an immutable Seq at the end: the result is cached in a
`lazy val` on
+ // IcebergScanTransformer (a case class captured by Spark task closures),
so it must not
+ // retain any reference to a non-serializable mutable collection.
+ val seenSchemes = scala.collection.mutable.HashSet.empty[String]
+ val rootPathsBuilder = Seq.newBuilder[String]
+
+ def recordPath(path: String): Unit = {
+ if (collectRootPaths) {
+ // Extract just the scheme prefix (e.g. "s3://", "hdfs://") without
going through
+ // java.net.URI, whose strict RFC 3986 parsing throws
URISyntaxException on file paths
+ // containing characters like spaces or '[' / ']' that Hadoop-style
paths otherwise
+ // tolerate (e.g. from a partition value with a space in it).
+ val schemeSeparator = path.indexOf("://")
+ val scheme = if (schemeSeparator >= 0) path.substring(0,
schemeSeparator) else ""
Review Comment:
Thanks for catching that. You're right, `file:/hdfs:` paths like that would
collide under the same empty scheme with the old check. Fixed it using `new
Path(path).toUri.getScheme`, exactly as you suggested. Verified it resolves
both schemes correctly without the collision now.
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