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https://issues.apache.org/jira/browse/FLINK-5710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15863828#comment-15863828
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ASF GitHub Bot commented on FLINK-5710:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3271#discussion_r100819100
--- Diff:
flink-libraries/flink-table/src/main/java/org/apache/flink/table/calcite/functions/FlinkStreamFunctionCatalog.java
---
@@ -0,0 +1,39 @@
+/*
+ * 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.flink.table.calcite.functions;
+
+import org.apache.calcite.sql.SqlFunction;
+import org.apache.calcite.sql.SqlFunctionCategory;
+import org.apache.calcite.sql.SqlKind;
+import org.apache.calcite.sql.type.OperandTypes;
+import org.apache.calcite.sql.type.ReturnTypes;
+import org.apache.calcite.sql.type.SqlReturnTypeInference;
+import org.apache.calcite.sql.type.SqlTypeName;
+
+public class FlinkStreamFunctionCatalog {
+
+ /**
+ * An explicit representation of TIMESTAMP as an SQL return type
+ */
+ private static final SqlReturnTypeInference TIMESTAMP =
ReturnTypes.explicit(SqlTypeName.TIMESTAMP, 0);
+
+ /**
+ * A a parameterless scalar function that just indicates processing
time mode.
+ */
+ public static final SqlFunction PROCTIME = new SqlFunction("PROCTIME",
SqlKind.OTHER_FUNCTION, TIMESTAMP, null, OperandTypes.NILADIC,
SqlFunctionCategory.TIMEDATE);
--- End diff --
The SQL function should also override ``getMonotonicity()`` to indicate
that the returned timestamp is increasing
> Add ProcTime() function to indicate StreamSQL
> ---------------------------------------------
>
> Key: FLINK-5710
> URL: https://issues.apache.org/jira/browse/FLINK-5710
> Project: Flink
> Issue Type: New Feature
> Components: DataStream API
> Reporter: Stefano Bortoli
> Assignee: Stefano Bortoli
> Priority: Minor
>
> procTime() is a parameterless scalar function that just indicates processing
> time mode
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