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https://issues.apache.org/jira/browse/FLINK-6250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15978904#comment-15978904
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ASF GitHub Bot commented on FLINK-6250:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3732#discussion_r112691071
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/UnsupportedOperatorsIndicatorFunctions.scala
---
@@ -0,0 +1,46 @@
+/*
+ * 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.functions
+
+import java.nio.charset.Charset
+import java.util.List
+
+import org.apache.calcite.rel.`type`._
+import org.apache.calcite.sql._
+import org.apache.calcite.sql.`type`.{OperandTypes, ReturnTypes,
SqlTypeFamily, SqlTypeName}
+import org.apache.calcite.sql.validate.SqlMonotonicity
+import org.apache.calcite.tools.RelBuilder
+import org.apache.flink.api.common.typeinfo.SqlTimeTypeInfo
+import org.apache.flink.table.api.TableException
+import org.apache.flink.table.expressions.LeafExpression
+import org.apache.calcite.sql.`type`.InferTypes
+import org.apache.calcite.sql.validate.SqlValidator
+import org.apache.calcite.sql.validate.SqlValidatorScope
+
+/**
+ * An SQL Function DISTINCT(<NUMERIC>) used to mark the DISTINCT operator
+ * on aggregation input. This is temporary workaround waiting for
+ * https://issues.apache.org/jira/browse/CALCITE-1740 being solved
+ */
+object DistinctAggregatorExtractor extends SqlFunction("DIST",
SqlKind.OTHER_FUNCTION,
+ ReturnTypes.ARG0, InferTypes.RETURN_TYPE,
+ OperandTypes.NUMERIC, SqlFunctionCategory.NUMERIC) {
--- End diff --
An aggregation function can also return non-numeric types such as
MIN(String). So `SqlFunctionCategory.NUMERIC` might not be the right category.
OTOH, I don't know how Calcite uses this category.
> Distinct procTime with Rows boundaries
> --------------------------------------
>
> Key: FLINK-6250
> URL: https://issues.apache.org/jira/browse/FLINK-6250
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: radu
> Assignee: Stefano Bortoli
>
> Support proctime with rows boundaries
> Q1.1. `SELECT SUM( DISTINCT b) OVER (ORDER BY procTime() ROWS BETWEEN 2
> PRECEDING AND CURRENT ROW) FROM stream1`
> Q1.1. `SELECT COUNT(b), SUM( DISTINCT b) OVER (ORDER BY procTime() ROWS
> BETWEEN 2 PRECEDING AND CURRENT ROW) FROM stream1`
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