ddl::Merge_file_sort::Cursor Struct Reference

Cursor for merging blocks from the same file. More...

Inheritance diagram for ddl::Merge_file_sort::Cursor:

Public Member Functions
	Cursor (Builder *builder, file_t *file, Dup *dup, Alter_stage *stage) noexcept
	Constructor. More...
dberr_t	prepare (Range range, size_t buffer_size) noexcept
	Prepare the cursor for reading. More...
dberr_t	fetch (const mrec_t *&mrec, ulint *&offsets) noexcept
	Fetch the next record. More...
dberr_t	next () noexcept
	Move to the next record. More...
dberr_t	seek (const file_t *file, Range range) noexcept
	Move the cursor to the start of the new records lists to merge. More...
size_t	size () const noexcept

Private Attributes
file_t *	m_file {}
	File to iterate over. More...
Merge_cursor	m_cursor
	Cursor to use for the merge. More...

Additional Inherited Members
Private Member Functions inherited from ut::Non_copyable
	Non_copyable (const Non_copyable &)=delete
Non_copyable &	operator= (const Non_copyable &)=delete
	Non_copyable ()=default
	~Non_copyable ()=default

Detailed Description

Cursor for merging blocks from the same file.

Constructor & Destructor Documentation

Cursor()

ddl::Merge_file_sort::Cursor::Cursor ( Builder *  builder, file_t *  file, Dup *  dup, Alter_stage *  stage  )

inlinenoexcept

Constructor.

Parameters

[in,out]	builder	Index builder instance.
[in]	file	File to iterate over.
[in,out]	dup	For reporting duplicates.
[in,out]	stage	PFS staging.

Member Function Documentation

fetch()

dberr_t ddl::Merge_file_sort::Cursor::fetch ( const mrec_t *&  mrec, ulint *&  offsets  )

noexcept

Fetch the next record.

Parameters

[out]	mrec	Row read from the file.
[out]	offsets	Column offsets inside mrec.

Returns

DB_SUCCESS or error code.

next()

dberr_t ddl::Merge_file_sort::Cursor::next ( void  )

noexcept

Move to the next record.

Returns

DB_SUCCESS, DB_END_OF_INDEX or error code.

prepare()

dberr_t ddl::Merge_file_sort::Cursor::prepare ( Range  range, size_t  buffer_size  )

noexcept

Prepare the cursor for reading.

Parameters

[in]	range	Ranges to merge in a pass.
[in]	buffer_size	IO Buffer size to use for reading.

Returns

DB_SUCCESS or error code.

seek()

dberr_t ddl::Merge_file_sort::Cursor::seek ( const file_t *  file, Range  range  )

noexcept

Move the cursor to the start of the new records lists to merge.

Parameters

[in]	file	File being scanned.
[in]	range	Seek to these offsets.

Returns

DB_SUCCESS or error code.

size()

size_t ddl::Merge_file_sort::Cursor::size ( ) const

inlinenoexcept

Returns

the number of active readers.

Member Data Documentation

m_cursor

Merge_cursor ddl::Merge_file_sort::Cursor::m_cursor

private

Cursor to use for the merge.

m_file

file_t* ddl::Merge_file_sort::Cursor::m_file {}

private

File to iterate over.

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

• storage/innobase/ddl/ddl0merge.cc