Github user dbtsai commented on a diff in the pull request:
https://github.com/apache/spark/pull/22684#discussion_r224179447
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/orc/OrcFilters.scala ---
@@ -90,32 +107,51 @@ private[orc] object OrcFilters extends Logging {
expression match {
case And(left, right) =>
- // At here, it is not safe to just convert one side if we do not
understand the
- // other side. Here is an example used to explain the reason.
+ // At here, it is not safe to just convert one side and remove the
other side
+ // if we do not understand what the parent filters are.
+ //
+ // Here is an example used to explain the reason.
// Let's say we have NOT(a = 2 AND b in ('1')) and we do not
understand how to
// convert b in ('1'). If we only convert a = 2, we will end up
with a filter
// NOT(a = 2), which will generate wrong results.
- // Pushing one side of AND down is only safe to do at the top
level.
- // You can see ParquetRelation's initializeLocalJobFunc method as
an example.
- for {
- _ <- buildSearchArgument(dataTypeMap, left, newBuilder)
- _ <- buildSearchArgument(dataTypeMap, right, newBuilder)
- lhs <- buildSearchArgument(dataTypeMap, left, builder.startAnd())
- rhs <- buildSearchArgument(dataTypeMap, right, lhs)
- } yield rhs.end()
+ //
+ // Pushing one side of AND down is only safe to do at the top
level or in the child
+ // AND before hitting NOT or OR conditions, and in this case, the
unsupported predicate
+ // can be safely removed.
+ val leftBuilderOption = createBuilder(dataTypeMap, left,
+ newBuilder, canPartialPushDownConjuncts)
+ val rightBuilderOption =
+ createBuilder(dataTypeMap, right, newBuilder,
canPartialPushDownConjuncts)
+ (leftBuilderOption, rightBuilderOption) match {
--- End diff --
ditto
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