Package com.amazonaws.athena.connectors.gcs.storage

Class StorageMetadata

java.lang.Object

com.amazonaws.athena.connectors.gcs.storage.StorageMetadata

public class StorageMetadata
extends Object

Constructor Summary

Constructors

Constructor	Description
StorageMetadata(String gcsCredentialJsonString)	Instantiate a storage data source object with provided config

Method Summary

Modifier and Type	Method	Description
org.apache.arrow.vector.types.pojo.Schema	buildTableSchema(com.amazonaws.services.glue.model.Table table, org.apache.arrow.memory.BufferAllocator allocator)	Builds the table schema based on the provided field
protected Optional<String>	getAnyFilenameInPath(String bucket, String prefixPath)	Retrieves the filename of any file that has a non-zero size within the bucket/prefix
protected org.apache.arrow.vector.types.pojo.Schema	getFileSchema(String bucketName, String path, org.apache.arrow.dataset.file.FileFormat format, org.apache.arrow.memory.BufferAllocator allocator)
List<Map<String,String>>	getPartitionFolders(org.apache.arrow.vector.types.pojo.Schema schema, TableName tableInfo, Constraints constraints, com.amazonaws.services.glue.AWSGlue awsGlue)	Retrieves a list of partition folders from the GCS bucket based on partition.pattern Table parameter and partition keys set forth in Glue table.
List<String>	getStorageSplits(URI locationUri)	Retrieves a list of StorageSplit that essentially contain the list of all files for a given table type in a storage location

Methods inherited from class java.lang.Object

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

Constructor Detail

StorageMetadata

public StorageMetadata(String gcsCredentialJsonString)
                throws IOException

Instantiate a storage data source object with provided config

Parameters:

gcsCredentialJsonString - An instance of GcsDatasourceConfig that contains necessary properties for instantiating an appropriate data source

Throws:

IOException - If occurs during initializing input stream with GCS credential JSON

Method Detail

getStorageSplits

public List<String> getStorageSplits(URI locationUri)

Retrieves a list of StorageSplit that essentially contain the list of all files for a given table type in a storage location

Parameters:

locationUri - location uri

Returns:

A list of files

getPartitionFolders

public List<Map<String,String>> getPartitionFolders(org.apache.arrow.vector.types.pojo.Schema schema,
                                                          TableName tableInfo,
                                                          Constraints constraints,
                                                          com.amazonaws.services.glue.AWSGlue awsGlue)
                                                   throws URISyntaxException

Retrieves a list of partition folders from the GCS bucket based on partition.pattern Table parameter and partition keys set forth in Glue table. If the summary from the constraints is empty (no where clauses or unsupported clauses), it will essentially return all the partition folders from the GCS bucket. If there is any constraints to apply, it will apply constraints to filter selected partition folder, to narrow down the data load

Parameters:

schema - An instance of Schema that describes underlying Table's schema

tableInfo - Name of the table

constraints - An instance of Constraints, captured from where clauses

awsGlue - An instance of AWSGlue

Returns:

A list of Map instances

Throws:

URISyntaxException - Throws if any occurs during parsing Uri

getAnyFilenameInPath

protected Optional<String> getAnyFilenameInPath(String bucket,
                                                String prefixPath)

Retrieves the filename of any file that has a non-zero size within the bucket/prefix

Parameters:

bucket - Name of the bucket

prefixPath - Prefix (aka, folder in Storage service) of the bucket from where this method with retrieve files

Returns:

A single file name under the prefix

getFileSchema

protected org.apache.arrow.vector.types.pojo.Schema getFileSchema(String bucketName,
                                                                  String path,
                                                                  org.apache.arrow.dataset.file.FileFormat format,
                                                                  org.apache.arrow.memory.BufferAllocator allocator)

buildTableSchema

public org.apache.arrow.vector.types.pojo.Schema buildTableSchema(com.amazonaws.services.glue.model.Table table,
                                                                  org.apache.arrow.memory.BufferAllocator allocator)
                                                           throws URISyntaxException

Builds the table schema based on the provided field

Parameters:

table - Glue table object

Returns:

An instance of Schema

Throws:

URISyntaxException