Package com.amazonaws.athena.connectors.cloudera

Class ImpalaMetadataHandler

java.lang.Object

com.amazonaws.athena.connector.lambda.handlers.MetadataHandler

com.amazonaws.athena.connectors.jdbc.manager.JdbcMetadataHandler

com.amazonaws.athena.connectors.cloudera.ImpalaMetadataHandler

All Implemented Interfaces:

com.amazonaws.services.lambda.runtime.RequestStreamHandler

public class ImpalaMetadataHandler
extends JdbcMetadataHandler

Field Summary

Fields inherited from class com.amazonaws.athena.connectors.jdbc.manager.JdbcMetadataHandler

jdbcQueryPassthrough, TABLES_AND_VIEWS

Fields inherited from class com.amazonaws.athena.connector.lambda.handlers.MetadataHandler

configOptions, DISABLE_SPILL_ENCRYPTION, KMS_KEY_ID_ENV, SPILL_BUCKET_ENV, SPILL_PREFIX_ENV

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ImpalaMetadataHandler(DatabaseConnectionConfig databaseConnectionConfiguration, com.amazonaws.services.secretsmanager.AWSSecretsManager secretManager, com.amazonaws.services.athena.AmazonAthena athena, JdbcConnectionFactory jdbcConnectionFactory, Map<String,String> configOptions)
	ImpalaMetadataHandler(DatabaseConnectionConfig databaseConnectionConfig, Map<String,String> configOptions)
	ImpalaMetadataHandler(Map<String,String> configOptions)

Method Summary

Modifier and Type	Method	Description
GetDataSourceCapabilitiesResponse	doGetDataSourceCapabilities(BlockAllocator allocator, GetDataSourceCapabilitiesRequest request)	Used to describe the types of capabilities supported by a data source.
GetSplitsResponse	doGetSplits(BlockAllocator blockAllocator, GetSplitsRequest getSplitsRequest)	Used to split-up the reads required to scan the requested batch of partition(s).
GetTableResponse	doGetTable(BlockAllocator blockAllocator, GetTableRequest getTableRequest)	Used to get definition (field names, types, descriptions, etc...) of an Impala Table.
void	getPartitions(BlockWriter blockWriter, GetTableLayoutRequest getTableLayoutRequest, QueryStatusChecker queryStatusChecker)	Used to get the Impala partitions that must be read from the request table in order to satisfy the requested predicate.
org.apache.arrow.vector.types.pojo.Schema	getPartitionSchema(String catalogName)	Delegates creation of partition schema to database type implementation.

Methods inherited from class com.amazonaws.athena.connectors.jdbc.manager.JdbcMetadataHandler

caseInsensitiveTableSearch, convertDatasourceTypeToArrow, doGetQueryPassthroughSchema, doListSchemaNames, doListTables, escapeNamePattern, getArrayArrowTypeFromTypeName, getCredentialProvider, getJdbcConnectionFactory, getSplitClauses, listPaginatedTables, listTables, setupQueryPassthroughSplit

Methods inherited from class com.amazonaws.athena.connector.lambda.handlers.MetadataHandler

doGetTableLayout, doHandleRequest, doPing, enhancePartitionSchema, getSecret, handleRequest, makeEncryptionKey, makeSpillLocation, onPing, resolveSecrets

Methods inherited from class java.lang.Object

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

Constructor Detail

ImpalaMetadataHandler

public ImpalaMetadataHandler(Map<String,String> configOptions)

ImpalaMetadataHandler

public ImpalaMetadataHandler(DatabaseConnectionConfig databaseConnectionConfig,
                             Map<String,String> configOptions)

ImpalaMetadataHandler

protected ImpalaMetadataHandler(DatabaseConnectionConfig databaseConnectionConfiguration,
                                com.amazonaws.services.secretsmanager.AWSSecretsManager secretManager,
                                com.amazonaws.services.athena.AmazonAthena athena,
                                JdbcConnectionFactory jdbcConnectionFactory,
                                Map<String,String> configOptions)

Method Detail

doGetDataSourceCapabilities

public GetDataSourceCapabilitiesResponse doGetDataSourceCapabilities(BlockAllocator allocator,
                                                                     GetDataSourceCapabilitiesRequest request)

Used to describe the types of capabilities supported by a data source. An engine can use this to determine what portions of the query to push down. A connector that returns any optimization will guarantee that the associated predicate will be pushed down.

Overrides:

doGetDataSourceCapabilities in class MetadataHandler

Parameters:

allocator - Tool for creating and managing Apache Arrow Blocks.

request - Provides details about the catalog being used.

Returns:

A GetDataSourceCapabilitiesResponse object which returns a map of supported optimizations that the connector is advertising to the consumer. The connector assumes all responsibility for whatever is passed here.

getPartitionSchema

public org.apache.arrow.vector.types.pojo.Schema getPartitionSchema(String catalogName)

Delegates creation of partition schema to database type implementation.

Specified by:

getPartitionSchema in class JdbcMetadataHandler

Parameters:

catalogName - Athena provided Impala catalog name.

Returns:

schema. See Schema

getPartitions

public void getPartitions(BlockWriter blockWriter,
                          GetTableLayoutRequest getTableLayoutRequest,
                          QueryStatusChecker queryStatusChecker)
                   throws Exception

Used to get the Impala partitions that must be read from the request table in order to satisfy the requested predicate.

Specified by:

getPartitions in class JdbcMetadataHandler

Parameters:

blockWriter - Used to write rows (Impala partitions) into the Apache Arrow response.

getTableLayoutRequest - Provides details of the catalog, database, and table being queried as well as any filter predicate.

queryStatusChecker - A QueryStatusChecker that you can use to stop doing work for a query that has already terminated

Throws:

Exception - An Exception should be thrown for database connection failures , query syntax errors and so on.

doGetSplits

public GetSplitsResponse doGetSplits(BlockAllocator blockAllocator,
                                     GetSplitsRequest getSplitsRequest)

Used to split-up the reads required to scan the requested batch of partition(s).

Specified by:

doGetSplits in class JdbcMetadataHandler

Parameters:

blockAllocator - Tool for creating and managing Apache Arrow Blocks.

getSplitsRequest - Provides details of the Impala catalog, database, table, and partition(s) being queried as well as any filter predicate.

Returns:

A GetSplitsResponse which primarily contains: 1. A Set of Splits which represent read operations Amazon Athena must perform by calling your read function. 2. (Optional) A continuation token which allows you to paginate the generation of splits for large queries.

doGetTable

public GetTableResponse doGetTable(BlockAllocator blockAllocator,
                                   GetTableRequest getTableRequest)
                            throws Exception

Used to get definition (field names, types, descriptions, etc...) of an Impala Table.

Overrides:

doGetTable in class JdbcMetadataHandler

Parameters:

blockAllocator - Tool for creating and managing Apache Arrow Blocks.

getTableRequest - Provides details on who made the request and which Athena catalog, database, and Impala table they are querying.

Returns:

A GetTableResponse which primarily contains: 1. An Apache Arrow Schema object describing the table's columns, types, and descriptions. 2. A Set of Strings of partition column names (or empty if the table isn't partitioned).

Throws:

Exception