[ https://issues.apache.org/jira/browse/SPARK-17614?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Paul Wu updated SPARK-17614: ---------------------------- Priority: Major (was: Minor) > 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 > Labels: cassandra-jdbc, sql > > 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 -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org