org.apache.metamodel.jdbc.dialects

Class HiveQueryRewriter

java.lang.Object

org.apache.metamodel.jdbc.dialects.AbstractQueryRewriter

org.apache.metamodel.jdbc.dialects.DefaultQueryRewriter

org.apache.metamodel.jdbc.dialects.RowNumberQueryRewriter

org.apache.metamodel.jdbc.dialects.HiveQueryRewriter

All Implemented Interfaces:

IQueryRewriter

public class HiveQueryRewriter
extends RowNumberQueryRewriter

Query rewriter for Apache Hive

Constructor Summary

Constructors

Constructor and Description
HiveQueryRewriter(JdbcDataContext dataContext)

Method Summary

Modifier and Type	Method and Description
boolean	isPrimaryKeySupported() Determines if the JDBC data source supports primary keys or not.
boolean	isTransactional() Determines if the JDBC data source supports transactions or not.
String	rewriteColumnType(ColumnType columnType, Integer columnSize) Rewrites the name of a column type, as it is written in CREATE TABLE statements.
String	rewriteQuery(Query query)

Methods inherited from class org.apache.metamodel.jdbc.dialects.RowNumberQueryRewriter

getRowNumberSql

Methods inherited from class org.apache.metamodel.jdbc.dialects.DefaultQueryRewriter

beforeRewrite, escapeQuotes, isAggregateFunctionSupported, isFirstRowSupported, isMaxRowsSupported, isScalarFunctionSupported, needsQuoting, rewriteFilterItem, rewriteFilterItemWithOperandLiteral, rewriteTimestamp

Methods inherited from class org.apache.metamodel.jdbc.dialects.AbstractQueryRewriter

getColumnType, getDataContext, getResultSetValue, isSchemaIncludedInColumnPaths, isSupportedVersion, rewriteColumnTypeInternal, rewriteFromClause, rewriteFromItem, rewriteFromItem, rewriteGroupByClause, rewriteGroupByItem, rewriteHavingClause, rewriteOrderByClause, rewriteOrderByItem, rewriteSelectClause, rewriteSelectItem, rewriteWhereClause, setStatementParameter, toTime, toTimestamp

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

HiveQueryRewriter

public HiveQueryRewriter(JdbcDataContext dataContext)

Method Detail

rewriteQuery

public String rewriteQuery(Query query)

Specified by:

rewriteQuery in interface IQueryRewriter

Overrides:

rewriteQuery in class AbstractQueryRewriter

rewriteColumnType

public String rewriteColumnType(ColumnType columnType,
                                Integer columnSize)

Description copied from interface: IQueryRewriter

Rewrites the name of a column type, as it is written in CREATE TABLE statements. Some databases dont support all column types, or have different names for them. The implementation of this method will do that conversion.

Specified by:

rewriteColumnType in interface IQueryRewriter

Overrides:

rewriteColumnType in class DefaultQueryRewriter

Parameters:

columnType - the (non-null) ColumnType to rewrite

columnSize - the (possibly null) column size that may or may not have been specified

Returns:

isTransactional

public boolean isTransactional()

Description copied from interface: IQueryRewriter

Determines if the JDBC data source supports transactions or not. Usually this is the case since JDBC is designed for ACID compliant databases, but in some cases the JDBC interface is used also to facilitate connectivity to non-transactional data source such as Apache Hive and others.

Specified by:

isTransactional in interface IQueryRewriter

Overrides:

isTransactional in class AbstractQueryRewriter

Returns:

isPrimaryKeySupported

public boolean isPrimaryKeySupported()

Description copied from interface: IQueryRewriter

Determines if the JDBC data source supports primary keys or not.

Specified by:

isPrimaryKeySupported in interface IQueryRewriter

Overrides:

isPrimaryKeySupported in class DefaultQueryRewriter

Returns: