Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/19651#discussion_r149315182
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcFilters.scala
---
@@ -0,0 +1,178 @@
+/*
+ * 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.execution.datasources.orc
+
+import org.apache.orc.storage.ql.io.sarg.{PredicateLeaf, SearchArgument,
SearchArgumentFactory}
+import org.apache.orc.storage.ql.io.sarg.SearchArgument.Builder
+import org.apache.orc.storage.serde2.io.HiveDecimalWritable
+
+import org.apache.spark.sql.sources.Filter
+import org.apache.spark.sql.types._
+
+/**
+ * Utility functions to convert Spark data source filters to ORC filters.
+ */
+private[orc] object OrcFilters {
+
+ /**
+ * Create ORC filter as a SearchArgument instance.
+ */
+ def createFilter(schema: StructType, filters: Seq[Filter]):
Option[SearchArgument] = {
+ val dataTypeMap = schema.map(f => f.name -> f.dataType).toMap
+
+ val convertibleFilters = for {
+ filter <- filters
+ _ <- buildSearchArgument(dataTypeMap, filter,
SearchArgumentFactory.newBuilder())
--- End diff --
This is a two-step approach which validates each individual filter is
convertible.
I'll add the comment of
[SPARK-12218](https://github.com/apache/spark/commit/8e23d8db7f28a97e2f4394cdf9d4c4260abbd750#diff-6cac9bc2656e3782b0312dceb8c55d47R60).
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