[GitHub] [spark] HyukjinKwon commented on a change in pull request #23942: [SPARK-27033][SQL]Add Optimize rule RewriteArithmeticFiltersOnIntegralColumn

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HyukjinKwon commented on a change in pull request #23942: [SPARK-27033][SQL]Add Optimize rule RewriteArithmeticFiltersOnIntegralColumn
URL: https://github.com/apache/spark/pull/23942#discussion_r268515459
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/RewriteArithmeticFiltersOnIntegralColumn.scala
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 @@ -0,0 +1,158 @@
+/*
+ * 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.catalyst.optimizer
+
+import org.apache.spark.sql.catalyst.expressions._
+import org.apache.spark.sql.catalyst.plans.logical.{Filter, LogicalPlan}
+import org.apache.spark.sql.catalyst.rules.Rule
+import org.apache.spark.sql.types._
+
+/**
+ * Rewrite arithmetic filters on an integral-type (e.g., byte, short, int and long)
+ * column to its equivalent form, leaving attribute alone in a left side, so that
+ * we can push it down to datasources (e.g., Parquet and ORC).
 
 Review comment:
   cc @liancheng per https://github.com/apache/spark/pull/8165

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