#include <relopsmgr.h>

Collaboration diagram for RelOpsManager:

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Public Member Functions
	RelOpsManager (FileManager file_mgr, BufferManager buf_mgr, Catalog catalog, const char result_path)
	Creates SwatDB Relops layer, the interface to the relational operations functionality of the DB.

HeapFile *	project (FileId rel_id, std::vector< FieldId > fields)
	Runs the Project operation.

HeapFile *	select (SelectType stype, FileId rel_id, std::vector< FieldId > fields, std::vector< Comp > comps, std::vector< void * > values, FileId index_id=INVALID_FILE_ID)
	Runs the Select operation using the type of select given by the argument stype.

HeapFile *	join (JoinType jtype, FileId o_fid, FileId i_fid, std::vector< FieldId > outer_field_ids, std::vector< FieldId > inner_field_ids, std::uint32_t block_size=0)
	Runs the Join operation using the type of join given by the argument jtype. This overloaded function only runs TupleNLJ and BlockNLJ, the others are implemented in the other overloaded versions.

HeapFile *	join (JoinType jtype, FileId o_fid, FileId i_fid, std::uint32_t num_buckets, std::vector< FieldId > outer_field_ids, std::vector< FieldId > inner_field_ids, std::uint32_t num_threads=0)
	Runs the Join operation using the type of join given by the argument jtype. This overloaded function only runs HashJoin and ParallelHashJoin, the others are implemented in the other overloaded versions.

bool	checkFilesEqual (FileId file1_id, FileId file2_id)
	Checks if two files have identical contents (every record in file1 also exists in file2 with the exact same value). This is done by running a join on all columns and returning true if the resulting file has the same number of records as the original files. Note: this will only work if neither files have any duplicates.

Private Member Functions
FileId	_createJoinRes (FileId outer_fid, FileId inner_fid, std::vector< FieldId > o_fields, std::vector< FieldId > i_fields)

FileId	_createProjectRes (Schema *rel_schema, std::vector< FieldId > fields)

FileId	_createResultFile (Schema *schema)

Private Attributes
FileManager *	file_mgr

BufferManager *	buf_mgr

Catalog *	catalog

int	result_num

Detailed Description

SwatDB RelOpsManager Class. The interface to relational operators layer of the system: manages relational operators.

Constructor & Destructor Documentation

◆ RelOpsManager()

RelOpsManager::RelOpsManager	(	FileManager *	file_mgr,
		BufferManager *	buf_mgr,
		Catalog *	catalog,
		const char *	result_path
	)

Creates SwatDB Relops layer, the interface to the relational operations functionality of the DB.

Precondition: Input parameter objects (file_mgr, buf_mgr, catalog) are initialized and valid.

Parameters

file_mgr	Pointer to the SwatDB FileManager.
buf_mgr	Pointer to the SwatDB BufferManager.
catalog	Pointer to the SwatDB Catalog.
result_path	if not NULL, sets the file path for operator results

Member Function Documentation

◆ _createJoinRes()

FileId RelOpsManager::_createJoinRes	(	FileId	outer_fid,
		FileId	inner_fid,
		std::vector< FieldId >	o_fields,
		std::vector< FieldId >	i_fields
	)

private

Creates a result file with the schema of the joined relations

◆ _createProjectRes()

FileId RelOpsManager::_createProjectRes	(	Schema *	rel_schema,
		std::vector< FieldId >	fields
	)

private

Creates a result file with the schema of rel_schema, but only the fields in the fields parameter. Used for the project operation.

◆ _createResultFile()

FileId RelOpsManager::_createResultFile ( Schema * schema )

private

Creates a result file with the schema given using result_num, then increments result_num

◆ checkFilesEqual()

bool RelOpsManager::checkFilesEqual	(	FileId	file1_id,
		FileId	file2_id
	)

Checks if two files have identical contents (every record in file1 also exists in file2 with the exact same value). This is done by running a join on all columns and returning true if the resulting file has the same number of records as the original files. Note: this will only work if neither files have any duplicates.

Precondition: Files have the same schema and no duplicate records.

Parameters

file1_id.	FileId of first file to be compared.
file2_id.	FileId of second file to be compared.

Exceptions

InvalidSchemaHeapFile if schemas do not match.

Returns: True if files are identical, False otherwise.

◆ join() [1/2]

HeapFile * RelOpsManager::join	(	JoinType	jtype,
		FileId	o_fid,
		FileId	i_fid,
		std::uint32_t	num_buckets,
		std::vector< FieldId >	outer_field_ids,
		std::vector< FieldId >	inner_field_ids,
		std::uint32_t	num_threads = `0`
	)

Runs the Join operation using the type of join given by the argument jtype. This overloaded function only runs HashJoin and ParallelHashJoin, the others are implemented in the other overloaded versions.

Precondition: Input parameters o_fid and i_fid are valid relation ids and fields and values align.

Parameters

jtype.	JoinType indicating type of join (tuplenlj, blocknlj, etc)
o_fid.	FileId of the outer relation of the join.
i_fid.	FileId of the inner relation of the join.
outer_field_ids.	Vector of field ids for the outer relation.
inner_field_ids.	Vector of field ids for the inner relation.
num_buckets.	Number of buckets used for hash joins..
num_threads.	Number of threads for parallel hash join.

◆ join() [2/2]

HeapFile * RelOpsManager::join	(	JoinType	jtype,
		FileId	o_fid,
		FileId	i_fid,
		std::vector< FieldId >	outer_field_ids,
		std::vector< FieldId >	inner_field_ids,
		std::uint32_t	block_size = `0`
	)

Runs the Join operation using the type of join given by the argument jtype. This overloaded function only runs TupleNLJ and BlockNLJ, the others are implemented in the other overloaded versions.

Precondition: Input parameters o_fid and i_fid are valid relation ids and fields and values align.

Parameters

jtype.	JoinType indicating type of join (tuplenlj, blocknlj, etc)
o_fid.	FileId of the outer relation of the join.
i_fid.	FileId of the inner relation of the join.
outer_field_ids.	Vector of field ids for the outer relation.
inner_field_ids.	Vector of field ids for the inner relation.
block_size.	Uint32 indicating block size if block nlj is run. This parameter is also used as the inner_index_id if the jtype is indexNLJ.

◆ project()

HeapFile * RelOpsManager::project	(	FileId	rel_id,
		std::vector< FieldId >	fields
	)

Runs the Project operation.

Precondition: Input parameters rel_id is a valid relation id to be projected on

Parameters

rel_id.	FileId corresponding to relation fileid being projected on
fields.	Vector of fieldids corresponding to fields being projected on`

Returns: HeapFile * of the result file with results of the project.

◆ select()

HeapFile * RelOpsManager::select	(	SelectType	stype,
		FileId	rel_id,
		std::vector< FieldId >	fields,
		std::vector< Comp >	comps,
		std::vector< void * >	values,
		FileId	index_id = `INVALID_FILE_ID`
	)

Runs the Select operation using the type of select given by the argument stype.

Precondition: Input parameters rel_id is a valid relation id to be selected on, and fields and values have the same types.

Parameters

stype.	SelectType indicating type of select (filescan, index)
rel_id.	FileId corresponding to relation fileid being selected on
fields.	Vector of fieldids corresponding to fields being selected on
comps.	Vector of Comp corresponding to comparators for selection
values.	Vector of void * corresponding to values for selection
index_id.	FileId with default value INVALID_FILE_ID corresponding to index file id if indexscan is being used.

Returns: HeapFile * of the result file with results of the select.

Member Data Documentation

◆ result_num

int RelOpsManager::result_num

private

Stores the current result number

The documentation for this class was generated from the following file:

relopsmgr.h

Public Member Functions

Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ RelOpsManager()

Member Function Documentation

◆ _createJoinRes()

◆ _createProjectRes()

◆ _createResultFile()

◆ checkFilesEqual()

◆ join() [1/2]

◆ join() [2/2]

◆ project()

◆ select()

Member Data Documentation

◆ result_num