Class to log the multi-value data and read it from the log.
More...
#include <data0data.h>
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| static uint32_t | read_log_len (const byte *ptr) |
| | Read the log length for the multi-value data log starting from ptr. More...
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| static const byte * | read (const byte *ptr, dfield_t *field, mem_heap_t *heap) |
| | Read the multi-value data from the ptr. More...
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| static uint32_t | get_keys_capacity (uint32_t log_size, uint32_t key_length, uint32_t *num_keys) |
| | Estimate how many multi-value keys at most can be accommodated into the log of specified size. More...
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| static bool | is_multi_value_log (const byte *ptr) |
| | Determine if the log starting from ptr is for multi-value data. More...
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Class to log the multi-value data and read it from the log.
◆ Multi_value_logger()
| Multi_value_logger::Multi_value_logger |
( |
const multi_value_data * |
mv_data, |
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uint32_t |
field_len |
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) |
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inline |
Constructor.
- Parameters
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| [in] | mv_data | multi-value data structure to log |
| [in] | field_len | multi-value data field length |
◆ get_keys_capacity()
| uint32_t Multi_value_logger::get_keys_capacity |
( |
uint32_t |
log_size, |
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uint32_t |
key_length, |
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uint32_t * |
num_keys |
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) |
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static |
Estimate how many multi-value keys at most can be accommodated into the log of specified size.
- Parameters
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| [in] | log_size | max log size |
| [in] | key_length | max multi-value key length, charset considered |
| [out] | num_keys | max possible number of multi-value keys |
- Returns
- the total size of the keys, let's assume all keys are concatenated one by one compactly
◆ get_log_len()
| uint32_t Multi_value_logger::get_log_len |
( |
bool |
precise | ) |
const |
Get the log length for the multi-value data.
- Parameters
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| [in] | precise | true if precise length is needed, false if rough estimation is OK |
- Returns
- the total log length for the multi-value data
◆ is_multi_value_log()
| static bool Multi_value_logger::is_multi_value_log |
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const byte * |
ptr | ) |
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inlinestatic |
Determine if the log starting from ptr is for multi-value data.
- Returns
- true if it is for multi-value data, otherwise false
◆ log()
| byte * Multi_value_logger::log |
( |
byte ** |
ptr | ) |
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Log the multi-value data to specified memory.
- Parameters
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| [in,out] | ptr | the memory to write |
- Returns
- next to the end of the multi-value data log
◆ read()
Read the multi-value data from the ptr.
- Parameters
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| [in] | ptr | log starting from here |
| [in,out] | field | multi-value data field to store the array |
| [in,out] | heap | memory heap |
- Returns
- next to the end of the multi-value data log
◆ read_log_len()
| uint32_t Multi_value_logger::read_log_len |
( |
const byte * |
ptr | ) |
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static |
Read the log length for the multi-value data log starting from ptr.
- Parameters
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| [in] | ptr | log starting from here |
- Returns
- the length of this log
◆ m_field_len
| uint32_t Multi_value_logger::m_field_len |
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private |
Multi-value field length.
◆ m_mv_data
◆ s_log_length_for_null_or_empty
| constexpr uint32_t Multi_value_logger::s_log_length_for_null_or_empty = 2 |
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staticconstexprprivate |
Length of log for NULL value or no indexed value cases.
◆ s_max_compressed_mv_key_length_size
| constexpr uint8_t Multi_value_logger::s_max_compressed_mv_key_length_size = 2 |
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staticconstexprprivate |
The compressed length for multi-value key length logging.
This would not be longer than 2 bytes for now, while 2 bytes can actually support key length of 16384 bytes. And the actual key length would never be longer than this
◆ s_multi_value_no_index_value
| constexpr uint16_t Multi_value_logger::s_multi_value_no_index_value = 0x0 |
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staticconstexprprivate |
Multi-value virtual column length, which indicates that there is no value on the multi-value index.
It's mapped to UNIV_NO_INDEX_VALUE
◆ s_multi_value_null
| constexpr uint16_t Multi_value_logger::s_multi_value_null = 0x1 |
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staticconstexprprivate |
Multi-value virtual column length, which indicates that the field is NULL.
It's mapped to UNIV_SQL_NULL. Since any not NULL and not no value multi-value data must be longer than 1 byte, so this is safe for this special meaning
◆ s_multi_value_virtual_col_length_marker
| constexpr uint8_t Multi_value_logger::s_multi_value_virtual_col_length_marker = 0xFF |
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staticconstexprprivate |
Multi-value virtual column length marker.
With this length marker, a multi-value virtual column undo log can be identified. Meanwhile, this marker should/will not conflict with any normal compressed written length leading byte
The documentation for this class was generated from the following files:
1.9.2