[jira] [Commented] (FLINK-5567) Introduce and migrate current table statistics to FlinkStatistics

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-5567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15865805#comment-15865805 ] 

ASF GitHub Bot commented on FLINK-5567:
---------------------------------------

Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3197#discussion_r101022558
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/stats/FlinkStatistic.scala ---
    @@ -0,0 +1,87 @@
    +/*
    + * 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.plan.stats
    +
    +import java.lang.Double
    +import java.util.{Collections, List}
    +
    +import org.apache.calcite.rel.{RelCollation, RelDistribution}
    +import org.apache.calcite.schema.Statistic
    +import org.apache.calcite.util.ImmutableBitSet
    +
    +/**
    +  * The class is responsible for provide statistics for flink table.
    +  *
    +  * @param tableStats
    +  */
    +class FlinkStatistic(tableStats: Option[TableStats]) extends Statistic {
    +
    +  /**
    +    * Get table stats
    +    *
    +    * @return table stats
    +    */
    +  def getTableStats: TableStats = tableStats.getOrElse(null)
    +
    +  /**
    +    * Get stats of specified column
    +    *
    +    * @param columnName which column to get stats
    +    * @return stats of specified column
    +    */
    +  def getColumnStats(columnName: String) = tableStats match {
    +    case Some(tStats) => tStats.colStats.getOrElse(columnName, null)
    +    case None => null
    +  }
    +
    +  /**
    +    * Get number of rows in the table
    +    *
    +    * @return number of rows in the table
    +    */
    +  override def getRowCount: Double = tableStats match {
    +    case Some(tStats) => tStats.rowCount.toDouble
    +    case None => null
    +  }
    +
    +  override def getCollations: List[RelCollation] = Collections.emptyList()
    +
    +  override def isKey(columns: ImmutableBitSet): Boolean = false
    +
    +  override def getDistribution: RelDistribution = null
    +
    +}
    +
    +/**
    +  * Utility functions regarding FlinkStatistic
    +  */
    +object FlinkStatistic {
    --- End diff --
    
    Rename to `FlinkStatistics`


> Introduce and migrate current table statistics to FlinkStatistics
> -----------------------------------------------------------------
>
>                 Key: FLINK-5567
>                 URL: https://issues.apache.org/jira/browse/FLINK-5567
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API & SQL
>            Reporter: Kurt Young
>            Assignee: zhangjing
>
> 1. Introduce FlinkStatistic class, which is subclass of Calcite Statistic.
>  2. Integrate FlinkStatistic with FlinkTable 



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