Package com.amazonaws.athena.connectors.dynamodb.resolver

Class DynamoDBTableResolver

java.lang.Object

com.amazonaws.athena.connectors.dynamodb.resolver.DynamoDBTableResolver

public class DynamoDBTableResolver
extends Object

This class helps with resolving the differences in casing between DynamoDB and Presto. Presto expects all databases, tables, and columns to be lower case. This class allows us to resolve DynamoDB tables which may have captial letters in them without issue. It does so by fetching all table names and doing a case insensitive search over them. It will first try to do a targeted get to reduce the penalty for tables which don't have capitalization. TODO add caching

Constructor Summary

Constructors

Constructor	Description
DynamoDBTableResolver(ThrottlingInvoker invoker, software.amazon.awssdk.services.dynamodb.DynamoDbClient ddbClient)

Method Summary

Modifier and Type	Method	Description
DynamoDBTable	getTableMetadata(String tableName)	Fetches table metadata by first doing a DescribeTable on the given table table, falling back to case insensitive resolution if the table isn't found.
org.apache.arrow.vector.types.pojo.Schema	getTableSchema(String tableName)	Fetches table schema by first doing a Scan on the given table name, falling back to case insensitive resolution if the table isn't found.
DynamoDBPaginatedTables	listTables(String token, int pageSize)	Fetches the list of tables from DynamoDB via paginated ListTables calls

Methods inherited from class java.lang.Object

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

Constructor Detail

DynamoDBTableResolver

public DynamoDBTableResolver(ThrottlingInvoker invoker,
                             software.amazon.awssdk.services.dynamodb.DynamoDbClient ddbClient)

Method Detail

listTables

public DynamoDBPaginatedTables listTables(String token,
                                          int pageSize)
                                   throws TimeoutException

Fetches the list of tables from DynamoDB via paginated ListTables calls

Returns:

the list of tables in DynamoDB

Throws:

TimeoutException

getTableSchema

public org.apache.arrow.vector.types.pojo.Schema getTableSchema(String tableName)
                                                         throws TimeoutException

Fetches table schema by first doing a Scan on the given table name, falling back to case insensitive resolution if the table isn't found. Delegates actual schema derivation to DDBTableUtils.peekTableForSchema(java.lang.String, com.amazonaws.athena.connector.lambda.ThrottlingInvoker, software.amazon.awssdk.services.dynamodb.DynamoDbClient).

Parameters:

tableName - the case insensitive table name

Returns:

the table's schema

Throws:

TimeoutException

getTableMetadata

public DynamoDBTable getTableMetadata(String tableName)
                               throws TimeoutException

Fetches table metadata by first doing a DescribeTable on the given table table, falling back to case insensitive resolution if the table isn't found.

Parameters:

tableName - the case insensitive table name

Returns:

the table's metadata

Throws:

TimeoutException