Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/6135#discussion_r30297299
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/orc/OrcFilters.scala ---
@@ -0,0 +1,121 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.hive.orc
+
+import org.apache.hadoop.hive.ql.io.sarg.SearchArgument
+import org.apache.hadoop.hive.ql.io.sarg.SearchArgument.Builder
+import org.apache.spark.Logging
+import org.apache.spark.sql.sources._
+
+private[sql] object OrcFilters extends Logging {
+
+ def createFilter(expr: Array[Filter]): Option[SearchArgument] = {
+ if (expr == null || expr.size == 0) return None
+ var sarg: Option[Builder] = Some(SearchArgument.FACTORY.newBuilder())
+ sarg.get.startAnd()
+ expr.foreach {
+ x => {
+ sarg match {
+ case Some(s1) => sarg = createFilter(x, s1)
+ case _ => None
+ }
+ }
+ }
+ sarg match {
+ case Some(b) => Some(b.end.build)
+ case _ => None
+ }
+ }
+
+ def createFilter(expression: Filter, builder: Builder): Option[Builder]
= {
+ expression match {
+ case p@And(left: Filter, right: Filter) => {
+ val b1 = builder.startAnd()
+ val b2 = createFilter(left, b1)
+ b2 match {
+ case Some(b) => val b3 = createFilter(right, b)
+ if (b3.isDefined) {
+ Some(b3.get.end)
+ } else {
+ None
+ }
+ case _ => None
+ }
+ }
+ case p@Or(left: Filter, right: Filter) => {
+ val b1 = builder.startOr()
+ val b2 = createFilter(left, b1)
+ b2 match {
+ case Some(b) => val b3 = createFilter(right, b)
+ if (b3.isDefined) {
+ Some(b3.get.end)
+ } else {
+ None
+ }
+ case _ => None
+ }
--- End diff --
Similarly, this clause can be simplified to
```scala
for {
lhs <- createFilter(left, builder.startOr())
rhs <- createFilter(right, lhs)
} yield rhs.end()
```
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