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From: fhueske <git@git.apache.org>
To: issues@flink.incubator.apache.org
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References: <git-pr-3732-flink@git.apache.org>
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Subject: [GitHub] flink pull request #3732: [FLINK-6250] Distinct procTime with Rows boundarie...
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Message-Id: <20170421151309.DEA96F4A37@git1-us-west.apache.org>
Date: Fri, 21 Apr 2017 15:13:09 +0000 (UTC)
archived-at: Fri, 21 Apr 2017 15:13:21 -0000

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.


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