Github user arina-ielchiieva commented on a diff in the pull request:
https://github.com/apache/drill/pull/1131#discussion_r170902502
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/stat/ParquetBooleanPredicates.java
---
@@ -0,0 +1,72 @@
+/*
+ * 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.drill.exec.expr.stat;
+
+import org.apache.drill.common.expression.BooleanOperator;
+import org.apache.drill.common.expression.ExpressionPosition;
+import org.apache.drill.common.expression.LogicalExpression;
+import org.apache.drill.common.expression.visitors.ExprVisitor;
+
+import java.util.List;
+
+public abstract class ParquetBooleanPredicates {
--- End diff --
1. Please remove abstract.
2. Add javadoc.
Here and in other two similar classes.
---
