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Posted to issues@spark.apache.org by "Paul Wu (JIRA)" <ji...@apache.org> on 2017/07/28 18:16:00 UTC
[jira] [Commented] (SPARK-17614) sparkSession.read() .jdbc(***) use
the sql syntax "where 1=0" that Cassandra does not support
[ https://issues.apache.org/jira/browse/SPARK-17614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16105425#comment-16105425 ]
Paul Wu commented on SPARK-17614:
---------------------------------
So create a new issue? Or this is not an issue to you?
> 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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