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https://issues.apache.org/jira/browse/DRILL-6174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16378832#comment-16378832
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ASF GitHub Bot commented on DRILL-6174:
---------------------------------------
Github user KulykRoman commented on a diff in the pull request:
https://github.com/apache/drill/pull/1131#discussion_r170971218
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/stat/ParquetPredicatesHelper.java
---
@@ -0,0 +1,41 @@
+/*
+ * 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
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * 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.parquet.column.statistics.Statistics;
+
+/**
+ * Parquet predicates class helper for filter pushdown.
+ */
+public class ParquetPredicatesHelper {
+
+ /**
+ * Check does the column chunk's statistics have all nulls
+ */
+ static boolean isAllNulls(Statistics stat, long rowCount) {
--- End diff --
@arina-ielchiieva,
Done.
> Parquet pushdown planning improvements
> --------------------------------------
>
> Key: DRILL-6174
> URL: https://issues.apache.org/jira/browse/DRILL-6174
> Project: Apache Drill
> Issue Type: Improvement
> Affects Versions: 1.12.0
> Reporter: Arina Ielchiieva
> Assignee: Roman Kulyk
> Priority: Major
> Labels: doc-impacting
> Fix For: 1.13.0
>
>
> Currently parquet pushdown planning has certain limitations
> (https://drill.apache.org/docs/parquet-filter-pushdown/). This Jira aims to
> fix some of them. List of improvements can be find below:
> 1. IS [NOT] NULL / TRUE / FALSE
> 2. Timestamp / date / time implicit / explicit casts
> {noformat}
> timestamp -> date
> timestamp -> varchar
> date -> timestamp
> date -> varchar
> time -> timestamp
> time -> date
> time -> varchar
> {noformat}
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