org.apache.hadoop.hive.metastore

Interface PartitionExpressionProxy

All Known Implementing Classes:

DefaultPartitionExpressionProxy, PartitionExpressionForMetastore

public interface PartitionExpressionProxy

The proxy interface that metastore uses for variety of QL operations (metastore can't depend on QL because QL depends on metastore; creating metastore-client module would be a proper way to solve this problem).

Method Summary

Modifier and Type	Method and Description
String	convertExprToFilter(byte[] expr) Converts serialized Hive expression into filter in the format suitable for Filter.g.
org.apache.hadoop.hive.ql.io.sarg.SearchArgument	createSarg(byte[] expr) Creates SARG from serialized representation.
boolean	filterPartitionsByExpr(List<org.apache.hadoop.hive.metastore.api.FieldSchema> partColumns, byte[] expr, String defaultPartitionName, List<String> partitionNames) Filters the partition names via serialized Hive expression.
FileFormatProxy	getFileFormatProxy(org.apache.hadoop.hive.metastore.api.FileMetadataExprType type) Gets a separate proxy that can be used to call file-format-specific methods.
org.apache.hadoop.hive.metastore.api.FileMetadataExprType	getMetadataType(String inputFormat) Determines the file metadata type from input format of the source table or partition.

Method Detail

convertExprToFilter

String convertExprToFilter(byte[] expr)
                    throws org.apache.hadoop.hive.metastore.api.MetaException

Converts serialized Hive expression into filter in the format suitable for Filter.g.

Parameters:

expr - Serialized expression.

Returns:

The filter string.

Throws:

org.apache.hadoop.hive.metastore.api.MetaException

filterPartitionsByExpr

boolean filterPartitionsByExpr(List<org.apache.hadoop.hive.metastore.api.FieldSchema> partColumns,
                               byte[] expr,
                               String defaultPartitionName,
                               List<String> partitionNames)
                        throws org.apache.hadoop.hive.metastore.api.MetaException

Filters the partition names via serialized Hive expression.

Parameters:

partColumns - Partition columns in the underlying table.

expr - Serialized expression.

defaultPartitionName - Default partition name from job or server configuration.

partitionNames - Partition names; the list is modified in place.

Returns:

Whether there were any unknown partitions preserved in the name list.

Throws:

org.apache.hadoop.hive.metastore.api.MetaException

getMetadataType

org.apache.hadoop.hive.metastore.api.FileMetadataExprType getMetadataType(String inputFormat)

Determines the file metadata type from input format of the source table or partition.

Parameters:

inputFormat - Input format name.

Returns:

The file metadata type.

getFileFormatProxy

FileFormatProxy getFileFormatProxy(org.apache.hadoop.hive.metastore.api.FileMetadataExprType type)

Gets a separate proxy that can be used to call file-format-specific methods.

Parameters:

type - The file metadata type.

Returns:

The proxy.

createSarg

org.apache.hadoop.hive.ql.io.sarg.SearchArgument createSarg(byte[] expr)

Creates SARG from serialized representation.

Parameters:

expr - SARG, serialized as Kryo.

Returns:

SARG.