szehon-ho commented on code in PR #54459:
URL: https://github.com/apache/spark/pull/54459#discussion_r2893171462
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sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/PushDownUtils.scala:
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@@ -22,24 +22,66 @@ import scala.collection.mutable
import org.apache.spark.sql.catalyst.expressions.{AttributeReference,
AttributeSet, Expression, NamedExpression, SchemaPruning}
import org.apache.spark.sql.catalyst.types.DataTypeUtils.toAttributes
import org.apache.spark.sql.catalyst.util.CharVarcharUtils
+import org.apache.spark.sql.connector.expressions.IdentityTransform
import org.apache.spark.sql.connector.expressions.SortOrder
-import org.apache.spark.sql.connector.expressions.filter.Predicate
+import org.apache.spark.sql.connector.expressions.filter.{PartitionPredicate,
Predicate}
import org.apache.spark.sql.connector.read.{Scan, ScanBuilder,
SupportsPushDownFilters, SupportsPushDownLimit, SupportsPushDownOffset,
SupportsPushDownRequiredColumns, SupportsPushDownTableSample,
SupportsPushDownTopN, SupportsPushDownV2Filters}
-import org.apache.spark.sql.execution.datasources.DataSourceStrategy
+import org.apache.spark.sql.execution.datasources.{DataSourceStrategy,
DataSourceUtils}
import org.apache.spark.sql.internal.SQLConf
-import org.apache.spark.sql.internal.connector.SupportsPushDownCatalystFilters
+import org.apache.spark.sql.internal.connector.{PartitionPredicateImpl,
SupportsPushDownCatalystFilters}
import org.apache.spark.sql.sources
-import org.apache.spark.sql.types.StructType
+import org.apache.spark.sql.types.{StructField, StructType}
import org.apache.spark.util.ArrayImplicits._
import org.apache.spark.util.collection.Utils
object PushDownUtils {
+
+ /**
+ * Returns partition schema as a StructType when the table partitioning.
+ * Currently only supported for identity transforms on simple (single-name)
field references.
+ *
+ * @return Some(StructType) for partition transform types, if supported.
+ */
+ def getPartitionSchemaForPartitionPredicate(
+ relation: DataSourceV2Relation): Option[StructType] = {
+ val partitioning = relation.table.partitioning().toIndexedSeq
+ val partitionColNamesOpt: Seq[Option[String]] = partitioning.map {
+ case id: IdentityTransform =>
+ id.ref.fieldNames().toIndexedSeq match {
+ case Seq(name) => Some(name)
+ case _ => None // Not supported for multiple field names (e.g.
nested field)
+ }
+ case _ => None
+ }
+ partitionColNamesOpt match {
+ // Only support identity transform on simple field reference
+ case seq if seq.isEmpty || seq.exists(_.isEmpty) => None
+ case _ =>
+ val partitionColNames = partitionColNamesOpt.map(_.get)
+ val attrs = partitionColNames.map(name => relation.output.find(_.name
== name))
Review Comment:
i replied to @gengliangwang comment earlier. It might also apply to this
comment?
current file based data source (ex, dsv1) does not support case insensitive
partition filter: see
https://github.com/apache/spark/blob/972897433082b1a7136b877b4fa37970961169d0/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/PartitioningAwareFileIndex.scala#L191
it sounds like a new feature, should we add it later with another flag? else
it diverge from current DSV1 behavior
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