Package org.apache.metamodel.jdbc.dialects

Class Hive2QueryRewriter

java.lang.Object

org.apache.metamodel.jdbc.dialects.AbstractQueryRewriter

org.apache.metamodel.jdbc.dialects.DefaultQueryRewriter

org.apache.metamodel.jdbc.dialects.LimitOffsetQueryRewriter

org.apache.metamodel.jdbc.dialects.Hive2QueryRewriter

All Implemented Interfaces:

IQueryRewriter

Direct Known Subclasses:

ImpalaQueryRewriter

public class Hive2QueryRewriter
extends LimitOffsetQueryRewriter

Query rewriter for Apache Hive

Constructor Summary

Constructors

Constructor	Description
Hive2QueryRewriter(JdbcDataContext dataContext)

Method Summary

Modifier and Type	Method	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(org.apache.metamodel.schema.ColumnType columnType, Integer columnSize)	Rewrites the name of a column type, as it is written in CREATE TABLE statements.

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

isFirstRowSupported, isMaxRowsSupported, rewriteQuery

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

beforeRewrite, escapeQuotes, isAggregateFunctionSupported, 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

Hive2QueryRewriter

public Hive2QueryRewriter(JdbcDataContext dataContext)

Method Detail

rewriteColumnType

public String rewriteColumnType(org.apache.metamodel.schema.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: