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https://issues.apache.org/jira/browse/SPARK-22113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16178698#comment-16178698
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Liang-Chi Hsieh commented on SPARK-22113:
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Hmm, actually we have the API {{def select(col: String, cols: String*):
DataFrame}}. So I think it doesn't select a string literal.
Actually I found the reason why the second JDBC-based query fails. I just
wonder if we should connect Hive with jdbc.
[~Michael Fu] Where is the spark-sql document you mentioned?
> Dataset shows in Hive is inconsistent with JDBC
> -----------------------------------------------
>
> Key: SPARK-22113
> URL: https://issues.apache.org/jira/browse/SPARK-22113
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Environment: version 2.2.0
> Reporter: Michael Fu
>
> I am trying to query data from Hive in spark. According spark-sql document,
> there're two ways to do this:
> The first way is Init session with _enableHiveSupport_
> {code:java}
> SparkSession session =
> SparkSession.builder().enableHiveSupport().getOrCreate();
> session.sql("select dw_date from tfdw.dwd_dim_date limit 10").show();
> {code}
> the dataset shows the correct result
> !https://i.stack.imgur.com/gBJCj.png!
> The second way is through JDBC
> {code:java}
> Dataset<Row> ds = session.read()
> .format("jdbc")
> .option("driver", "org.apache.hive.jdbc.HiveDriver")
> .option("url",
> "jdbc:hive2://iZ11syxr6afZ:21050/;auth=noSasl")
> .option("dbtable", "tfdw.dwd_dim_date")
> .load();
> ds.select("dw_date").limit(10).show();
> {code}
> But the dataset only show the column name in the result rather than the data
> in the column
> !https://i.stack.imgur.com/FBMDN.png!
> The two pictures should be consistent I think. Any outstanding I missed ?
> Many thanks!
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