andygrove commented on code in PR #1747:
URL: https://github.com/apache/datafusion-comet/pull/1747#discussion_r2145468079
##########
spark/src/main/scala/org/apache/comet/rules/CometScanRule.scala:
##########
@@ -105,8 +105,49 @@ case class CometScanRule(session: SparkSession) extends
Rule[SparkPlan] {
return withInfos(scanExec, fallbackReasons.toSet)
}
- val scanImpl = COMET_NATIVE_SCAN_IMPL.get()
- if (scanImpl == CometConf.SCAN_NATIVE_DATAFUSION &&
!COMET_EXEC_ENABLED.get()) {
+ var scanImpl = COMET_NATIVE_SCAN_IMPL.get()
+
+ // if scan is auto then pick best available scan
+ if (scanImpl == SCAN_AUTO) {
+ // TODO these checks are not yet exhaustive. For example,
native_datafusion does
+ // not support reading from object stores such as S3 yet
+
+ val typeChecker = CometScanTypeChecker(SCAN_NATIVE_ICEBERG_COMPAT)
+ val schemaSupported =
+ typeChecker.isSchemaSupported(scanExec.requiredSchema,
fallbackReasons)
+ val partitionSchemaSupported =
+ typeChecker.isSchemaSupported(r.partitionSchema, fallbackReasons)
+
+ // additional checks for known issues
+ def isComplexType(dt: DataType): Boolean = dt match {
+ case _: StructType | _: ArrayType | _: MapType => true
+ case _ => false
+ }
+
+ def hasKnownIssues(dataType: DataType): Boolean = {
+ dataType match {
+ case s: StructType => s.exists(field =>
hasKnownIssues(field.dataType))
+ case a: ArrayType => hasKnownIssues(a.elementType)
+ case m: MapType => isComplexType(m.keyType) ||
isComplexType(m.valueType)
+ case _ => false
Review Comment:
The current implementation of `hasKnownIssues` only returns `true` for maps
~of~ containing complex types (whether at the top level of within other complex
types), because at the time of writing, there was a known issue with maps of
structs. I'm not sure if this is still the case.
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