pack_rows.h File Reference

Generic routines for packing rows (possibly from multiple tables at the same time) into strings, and then back again. More...

#include <assert.h>
#include <stddef.h>
#include <string.h>
#include "field_types.h"
#include "my_bitmap.h"
#include "my_compiler.h"
#include "my_inttypes.h"
#include "my_table_map.h"
#include "mysql/components/services/bits/psi_bits.h"
#include "prealloced_array.h"
#include "sql/field.h"
#include "sql/handler.h"
#include "sql/table.h"
#include "template_utils.h"

Go to the source code of this file.

Classes
struct	pack_rows::Column
	A class that represents a field, which also holds a cached value of the field's data type. More...
struct	pack_rows::Table
	This struct is primarily used for holding the extracted columns in a hash join or BKA join, or the input columns in a streaming aggregation operation. More...
class	pack_rows::TableCollection
	A structure that contains a list of input tables for a hash join operation, BKA join operation or a streaming aggregation operation, and some pre-computed properties for the tables. More...

Namespaces
namespace	pack_rows

Enumerations
enum class	pack_rows::NullRowFlag { pack_rows::kNotNull , pack_rows::kNullWithoutData , pack_rows::kNullWithData }
	Possible values of the NULL-row flag stored by StoreFromTableBuffers(). More...

Functions
size_t	pack_rows::ComputeRowSizeUpperBound (const TableCollection &tables)
	Count up how many bytes a single row from the given tables will occupy, in "packed" format. More...
bool	pack_rows::StoreFromTableBuffers (const TableCollection &tables, String *buffer)
	Take the data marked for reading in "tables" and store it in the provided buffer. More...
const uchar *	pack_rows::LoadIntoTableBuffers (const TableCollection &tables, const uchar *ptr)
	Take the data in "ptr" and put it back to the tables' record buffers. More...
void	pack_rows::RequestRowId (const Prealloced_array< pack_rows::Table, 4 > &tables, table_map tables_to_get_rowid_for)
	For each of the given tables, request that the row ID is filled in (the equivalent of calling file->position()) if needed. More...
void	pack_rows::PrepareForRequestRowId (const Prealloced_array< Table, 4 > &tables, table_map tables_to_get_rowid_for)
bool	pack_rows::ShouldCopyRowId (const TABLE *table)
ALWAYS_INLINE uchar *	pack_rows::StoreFromTableBuffersRaw (const TableCollection &tables, uchar *dptr)

Detailed Description

Generic routines for packing rows (possibly from multiple tables at the same time) into strings, and then back again.

Used for (at least) hash join, BKA, and streaming aggregation.