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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-17614) sparkSession.read() .jdbc(***) use the sql syntax "where 1=0" that Cassandra does not support
Date Fri, 28 Jul 2017 18:12:01 GMT

     [ https://issues.apache.org/jira/browse/SPARK-17614?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sean Owen resolved SPARK-17614.
-------------------------------
    Resolution: Fixed

[~zwu.net@gmail.com] please don't reopen this

> sparkSession.read() .jdbc(***) use the sql syntax "where 1=0" that Cassandra does not
support
> ---------------------------------------------------------------------------------------------
>
>                 Key: SPARK-17614
>                 URL: https://issues.apache.org/jira/browse/SPARK-17614
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.0.0
>         Environment: Any Spark Runtime 
>            Reporter: Paul Wu
>            Assignee: Sean Owen
>            Priority: Minor
>              Labels: cassandra-jdbc, sql
>             Fix For: 2.1.0
>
>
> I have the code like the following with Cassandra JDBC (https://github.com/adejanovski/cassandra-jdbc-wrapper):
>  final String dbTable= "sql_demo";    
>         Dataset<Row> jdbcDF
>                 = sparkSession.read()
>                 .jdbc(CASSANDRA_CONNECTION_URL, dbTable, connectionProperties);
>         List<Row> rows = jdbcDF.collectAsList();
> It threw the error:
> Exception in thread "main" java.sql.SQLTransientException: com.datastax.driver.core.exceptions.SyntaxError:
line 1:29 no viable alternative at input '1' (SELECT * FROM sql_demo WHERE [1]...)
> 	at com.github.adejanovski.cassandra.jdbc.CassandraPreparedStatement.<init>(CassandraPreparedStatement.java:108)
> 	at com.github.adejanovski.cassandra.jdbc.CassandraConnection.prepareStatement(CassandraConnection.java:371)
> 	at com.github.adejanovski.cassandra.jdbc.CassandraConnection.prepareStatement(CassandraConnection.java:348)
> 	at com.github.adejanovski.cassandra.jdbc.CassandraConnection.prepareStatement(CassandraConnection.java:48)
> The reason is that the Spark jdbc code uses the sql syntax "where 1=0" somewhere (to
get the schema?), but Cassandra does not support this syntax. Not sure how this issue can
be resolved...this is because CQL is not standard sql. 
> The following log shows more information:
> 16/09/20 13:16:35 INFO CassandraConnection  138: Datacenter: %s; Host: %s; Rack: %s
> 16/09/20 13:16:35 TRACE CassandraPreparedStatement  98: CQL: SELECT * FROM sql_demo WHERE
1=0
> 16/09/20 13:16:35 TRACE RequestHandler  71: [19400322] com.datastax.driver.core.Statement$1@41ccb3b9
> 16/09/20 13:16:35 TRACE RequestHandler  272: [19400322-1] Starting



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