alexeykudinkin commented on code in PR #5244:
URL: https://github.com/apache/hudi/pull/5244#discussion_r845488181
##########
hudi-spark-datasource/hudi-spark-common/src/main/scala/org/apache/hudi/HoodieFileIndex.scala:
##########
@@ -196,12 +191,20 @@ case class HoodieFileIndex(spark: SparkSession,
* @return list of pruned (data-skipped) candidate base-files' names
*/
private def lookupCandidateFilesInMetadataTable(queryFilters:
Seq[Expression]): Try[Option[Set[String]]] = Try {
- if (!isDataSkippingEnabled || queryFilters.isEmpty ||
!HoodieTableMetadataUtil.getCompletedMetadataPartitions(metaClient.getTableConfig)
- .contains(HoodieTableMetadataUtil.PARTITION_NAME_COLUMN_STATS)) {
+ // NOTE: Data Skipping is only effective when it references columns that
are indexed w/in
+ // the Column Stats Index (CSI). Following cases could not be
effectively handled by Data Skipping:
+ // - Expressions on top-level column's fields (ie, for ex filters
like "struct.field > 0", since
+ // CSI only contains stats for top-level columns, in this case
for "struct")
+ // - Any expression not directly referencing top-level column
(for ex, sub-queries, since there's
+ // nothing CSI in particular could be applied for)
+ lazy val queryReferencedColumns = collectReferencedColumns(spark,
queryFilters, schema)
+
+ if (!isMetadataTableEnabled || !isColumnStatsIndexEnabled ||
!isColumnStatsIndexAvailable || !isDataSkippingEnabled) {
Review Comment:
As discussed offline: MT might be enabled on the write path, and therefore
have the Column Stats index available, but since we're deliberately splitting
configs for both Write/Read paths, we have to check whether these are enabled
on the Read path.
##########
hudi-spark-datasource/hudi-spark-common/src/main/scala/org/apache/hudi/HoodieFileIndex.scala:
##########
@@ -196,12 +191,20 @@ case class HoodieFileIndex(spark: SparkSession,
* @return list of pruned (data-skipped) candidate base-files' names
*/
private def lookupCandidateFilesInMetadataTable(queryFilters:
Seq[Expression]): Try[Option[Set[String]]] = Try {
- if (!isDataSkippingEnabled || queryFilters.isEmpty ||
!HoodieTableMetadataUtil.getCompletedMetadataPartitions(metaClient.getTableConfig)
Review Comment:
Please check my comment above
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