Package com.amazonaws.athena.connectors.db2

Class Db2MetadataHandler

java.lang.Object

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

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

com.amazonaws.athena.connectors.db2.Db2MetadataHandler

All Implemented Interfaces:

com.amazonaws.services.lambda.runtime.RequestStreamHandler

public class Db2MetadataHandler
extends JdbcMetadataHandler

Field Summary

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

caseResolver, 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
	Db2MetadataHandler(DatabaseConnectionConfig databaseConnectionConfig, JdbcConnectionFactory jdbcConnectionFactory, Map<String,String> configOptions)	To be used by Mux.
	Db2MetadataHandler(DatabaseConnectionConfig databaseConnectionConfig, Map<String,String> configOptions)	TO be used by Mux.
protected	Db2MetadataHandler(DatabaseConnectionConfig databaseConnectionConfig, software.amazon.awssdk.services.secretsmanager.SecretsManagerClient secretsManager, software.amazon.awssdk.services.athena.AthenaClient athena, JdbcConnectionFactory jdbcConnectionFactory, Map<String,String> configOptions, JDBCCaseResolver caseResolver)
	Db2MetadataHandler(Map<String,String> configOptions)	Instantiates handler to be used by Lambda function directly.

Method Summary

Modifier and Type	Method	Description
GetDataSourceCapabilitiesResponse	doGetDataSourceCapabilities(BlockAllocator allocator, GetDataSourceCapabilitiesRequest request)	Overridden this method to describe the types of capabilities supported by a data source
GetSplitsResponse	doGetSplits(BlockAllocator blockAllocator, GetSplitsRequest getSplitsRequest)	Split(s) will be created based on table partition.
ListSchemasResponse	doListSchemaNames(BlockAllocator blockAllocator, ListSchemasRequest listSchemasRequest)	Overridden this method to fetch only user defined schema(s) in Athena Data window.
void	getPartitions(BlockWriter blockWriter, GetTableLayoutRequest getTableLayoutRequest, QueryStatusChecker queryStatusChecker)	A partition is represented by a partition column(s) of type varchar.
org.apache.arrow.vector.types.pojo.Schema	getPartitionSchema(String catalogName)	Creates Schema object with arrow compatible filed to frame the partition.
protected org.apache.arrow.vector.types.pojo.Schema	getSchema(Connection jdbcConnection, TableName tableName, org.apache.arrow.vector.types.pojo.Schema partitionSchema)	Appropriate data type to arrow type conversions will be done by fetching data types of columns.
protected List<TableName>	listTables(Connection connection, String schemaName)	Overridden the base class method to provide DB2-specific table listing functionality.

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

convertDatasourceTypeToArrow, doGetQueryPassthroughSchema, doGetTable, doListTables, escapeNamePattern, getArrayArrowTypeFromTypeName, getColumns, getCredentialProvider, getDatabaseConnectionConfig, getJdbcConnectionFactory, getSplitClauses, listDatabaseNames, listPaginatedTables, setupQueryPassthroughSplit, wrapNameWithEscapedCharacter

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

Db2MetadataHandler

public Db2MetadataHandler(Map<String,String> configOptions)

Instantiates handler to be used by Lambda function directly.

Recommend using Db2MuxCompositeHandler instead.

Db2MetadataHandler

public Db2MetadataHandler(DatabaseConnectionConfig databaseConnectionConfig,
                          Map<String,String> configOptions)

TO be used by Mux.

Parameters:

databaseConnectionConfig -

Db2MetadataHandler

public Db2MetadataHandler(DatabaseConnectionConfig databaseConnectionConfig,
                          JdbcConnectionFactory jdbcConnectionFactory,
                          Map<String,String> configOptions)

To be used by Mux.

Parameters:

databaseConnectionConfig -

jdbcConnectionFactory -

Db2MetadataHandler

protected Db2MetadataHandler(DatabaseConnectionConfig databaseConnectionConfig,
                             software.amazon.awssdk.services.secretsmanager.SecretsManagerClient secretsManager,
                             software.amazon.awssdk.services.athena.AthenaClient athena,
                             JdbcConnectionFactory jdbcConnectionFactory,
                             Map<String,String> configOptions,
                             JDBCCaseResolver caseResolver)

Method Detail

doListSchemaNames

public ListSchemasResponse doListSchemaNames(BlockAllocator blockAllocator,
                                             ListSchemasRequest listSchemasRequest)
                                      throws Exception

Overridden this method to fetch only user defined schema(s) in Athena Data window.

Overrides:

doListSchemaNames in class JdbcMetadataHandler

Parameters:

blockAllocator -

listSchemasRequest -

Returns:

Throws:

Exception

listTables

protected List<TableName> listTables(Connection connection,
                                     String schemaName)
                              throws SQLException

Overridden the base class method to provide DB2-specific table listing functionality.

Overrides:

listTables in class JdbcMetadataHandler

Parameters:

connection - The JDBC connection to use for querying DB2

schemaName - The name of the schema to list tables from

Returns:

A list of TableName objects representing the tables and views in the specified schema

Throws:

SQLException - if there is an error executing the query or processing the results

getPartitionSchema

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

Creates Schema object with arrow compatible filed to frame the partition.

Specified by:

getPartitionSchema in class JdbcMetadataHandler

Parameters:

catalogName - Athena provided catalog name.

Returns:

getPartitions

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

A partition is represented by a partition column(s) of type varchar. In case of Db2 connector, partitions are created using below organization schemes. - Distribute by Hash - Partition by range - Organize by dimensions The partition details such as no. of partitions, column name are fetched from the Db2 metadata table(s). A custom query is then used to get the partition. Based upon the number of distinct partitions received, the splits are being created.

Specified by:

getPartitions in class JdbcMetadataHandler

Parameters:

blockWriter -

getTableLayoutRequest -

queryStatusChecker -

Throws:

Exception

doGetSplits

public GetSplitsResponse doGetSplits(BlockAllocator blockAllocator,
                                     GetSplitsRequest getSplitsRequest)

Split(s) will be created based on table partition. We are taking ContinuationToken from GetSplitsRequest object and loop upto row count of the partitions, and inside loop we are creating Split objects. In each Split object we are adding properties to be used in partition framing.

Specified by:

doGetSplits in class JdbcMetadataHandler

Parameters:

blockAllocator -

getSplitsRequest -

Returns:

doGetDataSourceCapabilities

public GetDataSourceCapabilitiesResponse doGetDataSourceCapabilities(BlockAllocator allocator,
                                                                     GetDataSourceCapabilitiesRequest request)

Overridden this method to describe the types of capabilities supported by a data source

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 capabilities

getSchema

protected org.apache.arrow.vector.types.pojo.Schema getSchema(Connection jdbcConnection,
                                                              TableName tableName,
                                                              org.apache.arrow.vector.types.pojo.Schema partitionSchema)
                                                       throws Exception

Appropriate data type to arrow type conversions will be done by fetching data types of columns. This function creates the arrow Schema pojo from jdbc database metadata of the table.

Overrides:

getSchema in class JdbcMetadataHandler

Parameters:

jdbcConnection -

tableName -

partitionSchema -

Returns:

Throws:

Exception