Partial_update_info Struct Reference

A struct that contains execution time state used for partial update of JSON columns. More...

Public Member Functions
	Partial_update_info (const TABLE *table, const MY_BITMAP *columns, bool logical_diffs)
	~Partial_update_info ()
bool	collect_logical_diffs () const
	Should logical JSON diffs be collected in addition to binary diffs? More...

Public Attributes
MY_BITMAP	m_enabled_binary_diff_columns
	The columns for which partial update using binary diffs is enabled in the current row. More...
MY_BITMAP	m_enabled_logical_diff_columns
	The columns for which partial update using logical JSON diffs is enabled in the current row. More...
Mem_root_array< Binary_diff_vector * >	m_binary_diff_vectors
	The binary diffs that have been collected for the current row. More...
Mem_root_array< Json_diff_vector * >	m_logical_diff_vectors
	The logical diffs that have been collected for JSON operations in the current row. More...
String	m_buffer
	A buffer that can be used to hold the partially updated column value while performing the update in memory. More...

Detailed Description

A struct that contains execution time state used for partial update of JSON columns.

Constructor & Destructor Documentation

Partial_update_info()

Partial_update_info::Partial_update_info ( const TABLE *  table, const MY_BITMAP *  columns, bool  logical_diffs  )

inline

~Partial_update_info()

Partial_update_info::~Partial_update_info ( )

inline

Member Function Documentation

collect_logical_diffs()

bool Partial_update_info::collect_logical_diffs ( ) const

inline

Should logical JSON diffs be collected in addition to binary diffs?

Member Data Documentation

m_binary_diff_vectors

Mem_root_array<Binary_diff_vector *> Partial_update_info::m_binary_diff_vectors

The binary diffs that have been collected for the current row.

The Binary_diff_vector objects live entirely in a MEM_ROOT, so there is no need to destroy them when this object is destroyed.

m_buffer

String Partial_update_info::m_buffer

A buffer that can be used to hold the partially updated column value while performing the update in memory.

m_enabled_binary_diff_columns

MY_BITMAP Partial_update_info::m_enabled_binary_diff_columns

The columns for which partial update using binary diffs is enabled in the current row.

m_enabled_logical_diff_columns

MY_BITMAP Partial_update_info::m_enabled_logical_diff_columns

The columns for which partial update using logical JSON diffs is enabled in the current row.

m_logical_diff_vectors

Mem_root_array<Json_diff_vector *> Partial_update_info::m_logical_diff_vectors

The logical diffs that have been collected for JSON operations in the current row.

Whereas the Json_diff_vector objects live in a MEM_ROOT and their memory will be reclaimed automatically, the Json_diff objects within them can own memory allocated on the heap, so they will have to be destroyed when this object is destroyed.

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

• sql/table.cc