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https://issues.apache.org/jira/browse/DRILL-6768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16669848#comment-16669848
]
ASF GitHub Bot commented on DRILL-6768:
---------------------------------------
KazydubB commented on a change in pull request #1494: DRILL-6768: Improve
to_date, to_time and to_timestamp and correspondi…
URL: https://github.com/apache/drill/pull/1494#discussion_r229286194
##########
File path:
logical/src/main/java/org/apache/drill/common/expression/fn/ToFunctions.java
##########
@@ -0,0 +1,130 @@
+/*
+ * 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.common.expression.fn;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.drill.common.types.TypeProtos.DataMode;
+import org.apache.drill.common.types.TypeProtos.MinorType;
+
+public class ToFunctions {
+
+ private static Map<MinorType, String> TO_FUNC = new HashMap<>();
+ /** The to functions that need to be replaced (if
+ * "drill.exec.functions.cast_empty_string_to_null" is set to true). */
+ private static Set<String> TO_FUNC_REPLACEMENT_NEEDED = new HashSet<>();
+ /** Map from the replaced functions to the new ones (for non-nullable
VARCHAR). */
+ private static Map<String, String> FUNC_REPLACEMENT_FROM_NONNULLABLE_VARCHAR
= new HashMap<>();
+ /** Map from the replaced functions to the new ones (for non-nullable
VAR16CHAR). */
+ private static Map<String, String>
FUNC_REPLACEMENT_FROM_NONNULLABLE_VAR16CHAR = new HashMap<>();
+ /** Map from the replaced functions to the new ones (for non-nullable
VARBINARY). */
+ private static Map<String, String>
FUNC_REPLACEMENT_FROM_NONNULLABLE_VARBINARY = new HashMap<>();
+ /** Map from the replaced functions to the new ones (for nullable VARCHAR).
*/
+ private static Map<String, String> FUNC_REPLACEMENT_FROM_NULLABLE_VARCHAR =
new HashMap<>();
+ /** Map from the replaced functions to the new ones (for nullable
VAR16CHAR). */
+ private static Map<String, String> FUNC_REPLACEMENT_FROM_NULLABLE_VAR16CHAR
= new HashMap<>();
+ /** Map from the replaced functions to the new ones (for nullable
VARBINARY). */
+ private static Map<String, String> FUNC_REPLACEMENT_FROM_NULLABLE_VARBINARY
= new HashMap<>();
+
+ static {
+ TO_FUNC.put(MinorType.DATE, "to_date");
Review comment:
Filed issue: https://issues.apache.org/jira/browse/DRILL-6817. And resolved
it here subsequently.
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> Improve to_date, to_time and to_timestamp and corresponding cast functions to
> handle empty string when `drill.exec.functions.cast_empty_string_to_null`
> option is enabled
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: DRILL-6768
> URL: https://issues.apache.org/jira/browse/DRILL-6768
> Project: Apache Drill
> Issue Type: Improvement
> Affects Versions: 1.14.0
> Reporter: Bohdan Kazydub
> Assignee: Bohdan Kazydub
> Priority: Major
> Labels: doc-impacting
> Fix For: 1.15.0
>
>
> When `drill.exec.functions.cast_empty_string_to_null` option is enabled
> `to_date`, `to_time` and `to_timestamp` functions while converting string to
> according type in case if null or empty string values are passed will return
> NULL (to avoid CASE clauses which are littering a query and will work in
> accordance with their respective CAST counterparts) for both cases.
>
>
>
> CASTs will be handled in a similar way (uniformly with numeric types):
>
> ||Value to cast||Now||Will be||
> |NULL|NULL|NULL|
> |'' (empty string)|Error in many cases (except numerical types)|NULL|
> CAST empty string to null (in case of enabled option) will be supported by
> DATE, TIME, TIMESTAMP, INTERVAL YEAR, INTERVAL MONTH and INTERVAL DAY
> functions in addition to numeric types.
>
> *For documentation*
> TBA
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