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org.apache.lens.server.api.query
Interface QueryRewriter

All Known Implementing Classes:

ColumnarSQLRewriter, JDBCDriver.DummyQueryRewriter

public interface QueryRewriter

The Interface QueryRewriter.

Method Summary

void	init(org.apache.hadoop.conf.Configuration rewriteConf) Set conf for the rewriter
String	rewrite(String query, org.apache.hadoop.conf.Configuration queryConf, org.apache.hadoop.hive.conf.HiveConf metastoreConf) Rewrite.

Method Detail

rewrite

String rewrite(String query,
               org.apache.hadoop.conf.Configuration queryConf,
               org.apache.hadoop.hive.conf.HiveConf metastoreConf)
               throws LensException

Rewrite.

Parameters:

query - the query

queryConf - the query configuration

metastoreConf - The metastore configuration. If rewriters requires to access metastore, this configuration needs to passed

Returns:

the string

Throws:

LensException - the lens exception

init

void init(org.apache.hadoop.conf.Configuration rewriteConf)

Set conf for the rewriter

Parameters:

rewriteConf - Configuration required for rewriter init