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https://issues.apache.org/jira/browse/SPARK-16990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15422105#comment-15422105
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Ron Hu commented on SPARK-16990:
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We will follow the agreed design spec and add the following information to
Statistics class:
- totalSize: Total uncompressed output data size from a LogicalPlan node.
- rowCount: Number of output rows from a LogicalPlan node.
- fileNumber Number of files (or number of HDFS data blocks). Currently
only useful when a LogicalPlan is a relation.
- basicStats: Basic column statistics, i.e., max, min, number of nulls,
number of distinct values, max column length, average column length.
- Histograms: Histograms of columns, i.e., equi-width histogram (for
numeric and string types) and equi-height histogram (only for numeric types).
- histogramMins: Maintain min values for numeric columns.
> Define the data structure to hold the statistics for CBO
> --------------------------------------------------------
>
> Key: SPARK-16990
> URL: https://issues.apache.org/jira/browse/SPARK-16990
> Project: Spark
> Issue Type: Sub-task
> Components: Optimizer
> Affects Versions: 2.1.0
> Reporter: Ron Hu
>
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