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https://issues.apache.org/jira/browse/SPARK-29634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16961830#comment-16961830
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Zhaoyang Qin commented on SPARK-29634:
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Hive doc says:
{panel:title=Char}
Char types are similar to Varchar but they are fixed-length meaning that values
shorter than the specified length value are padded with spaces but trailing
spaces are not important during comparisons. The maximum length is fixed at 255.
{panel}
> spark-sql can't query hive table values that with schema Char by equality.
> --------------------------------------------------------------------------
>
> Key: SPARK-29634
> URL: https://issues.apache.org/jira/browse/SPARK-29634
> Project: Spark
> Issue Type: Bug
> Components: Spark Shell, SQL
> Affects Versions: 2.2.1, 2.3.1
> Environment: Spark 2.3.1
> Hive 3.0.0
> TPCDS Data & Tables
> Reporter: Zhaoyang Qin
> Priority: Major
> Labels: spark-sql, spark-sql-perf
>
> spark-sql can't query hive table values that with schema Char by equality.
> When i use spark-sql CLI to execute a query with hive tables,The expected
> results can not be obtained. The query result is empty. Some equality
> conditions did not work as expected.I checked and found that the table fields
> had one thing in common: they were created as char，sometimes as varchar.Then
> I execute the following statement and return an empty result: select * from
> foo where bar = 'something'.In fact, the data does exist. Using hive sql
> returns the correct results.
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