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authorSergei Golubchik <vuvova@gmail.com>2015-05-04 19:17:21 +0200
committerSergei Golubchik <vuvova@gmail.com>2015-05-04 19:17:21 +0200
commit6d06fbbd1dc25b3c12568f9038060dfdb69f9683 (patch)
tree21e27f3fddc89f9dda6b337091464ba10c490123 /storage/innobase/include/row0upd.h
parent1645930d0bd02f79df3ebff412b90acdc15bd9a0 (diff)
downloadmariadb-git-6d06fbbd1dc25b3c12568f9038060dfdb69f9683.tar.gz
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+/*****************************************************************************
+
+Copyright (c) 1996, 2012, Oracle and/or its affiliates. All Rights Reserved.
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; version 2 of the License.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
+
+*****************************************************************************/
+
+/**************************************************//**
+@file include/row0upd.h
+Update of a row
+
+Created 12/27/1996 Heikki Tuuri
+*******************************************************/
+
+#ifndef row0upd_h
+#define row0upd_h
+
+#include "univ.i"
+#include "data0data.h"
+#include "row0types.h"
+#include "btr0types.h"
+#include "dict0types.h"
+#include "trx0types.h"
+
+#ifndef UNIV_HOTBACKUP
+# include "btr0pcur.h"
+# include "que0types.h"
+# include "pars0types.h"
+#endif /* !UNIV_HOTBACKUP */
+
+/*********************************************************************//**
+Creates an update vector object.
+@return own: update vector object */
+UNIV_INLINE
+upd_t*
+upd_create(
+/*=======*/
+ ulint n, /*!< in: number of fields */
+ mem_heap_t* heap); /*!< in: heap from which memory allocated */
+/*********************************************************************//**
+Returns the number of fields in the update vector == number of columns
+to be updated by an update vector.
+@return number of fields */
+UNIV_INLINE
+ulint
+upd_get_n_fields(
+/*=============*/
+ const upd_t* update); /*!< in: update vector */
+#ifdef UNIV_DEBUG
+/*********************************************************************//**
+Returns the nth field of an update vector.
+@return update vector field */
+UNIV_INLINE
+upd_field_t*
+upd_get_nth_field(
+/*==============*/
+ const upd_t* update, /*!< in: update vector */
+ ulint n); /*!< in: field position in update vector */
+#else
+# define upd_get_nth_field(update, n) ((update)->fields + (n))
+#endif
+#ifndef UNIV_HOTBACKUP
+/*********************************************************************//**
+Sets an index field number to be updated by an update vector field. */
+UNIV_INLINE
+void
+upd_field_set_field_no(
+/*===================*/
+ upd_field_t* upd_field, /*!< in: update vector field */
+ ulint field_no, /*!< in: field number in a clustered
+ index */
+ dict_index_t* index, /*!< in: index */
+ trx_t* trx); /*!< in: transaction */
+/*********************************************************************//**
+Returns a field of an update vector by field_no.
+@return update vector field, or NULL */
+UNIV_INLINE
+const upd_field_t*
+upd_get_field_by_field_no(
+/*======================*/
+ const upd_t* update, /*!< in: update vector */
+ ulint no) /*!< in: field_no */
+ __attribute__((nonnull, pure));
+/*********************************************************************//**
+Writes into the redo log the values of trx id and roll ptr and enough info
+to determine their positions within a clustered index record.
+@return new pointer to mlog */
+UNIV_INTERN
+byte*
+row_upd_write_sys_vals_to_log(
+/*==========================*/
+ dict_index_t* index, /*!< in: clustered index */
+ trx_id_t trx_id, /*!< in: transaction id */
+ roll_ptr_t roll_ptr,/*!< in: roll ptr of the undo log record */
+ byte* log_ptr,/*!< pointer to a buffer of size > 20 opened
+ in mlog */
+ mtr_t* mtr); /*!< in: mtr */
+/*********************************************************************//**
+Updates the trx id and roll ptr field in a clustered index record when
+a row is updated or marked deleted. */
+UNIV_INLINE
+void
+row_upd_rec_sys_fields(
+/*===================*/
+ rec_t* rec, /*!< in/out: record */
+ page_zip_des_t* page_zip,/*!< in/out: compressed page whose
+ uncompressed part will be updated, or NULL */
+ dict_index_t* index, /*!< in: clustered index */
+ const ulint* offsets,/*!< in: rec_get_offsets(rec, index) */
+ const trx_t* trx, /*!< in: transaction */
+ roll_ptr_t roll_ptr);/*!< in: roll ptr of the undo log record,
+ can be 0 during IMPORT */
+/*********************************************************************//**
+Sets the trx id or roll ptr field of a clustered index entry. */
+UNIV_INTERN
+void
+row_upd_index_entry_sys_field(
+/*==========================*/
+ dtuple_t* entry, /*!< in/out: index entry, where the memory
+ buffers for sys fields are already allocated:
+ the function just copies the new values to
+ them */
+ dict_index_t* index, /*!< in: clustered index */
+ ulint type, /*!< in: DATA_TRX_ID or DATA_ROLL_PTR */
+ ib_uint64_t val); /*!< in: value to write */
+/*********************************************************************//**
+Creates an update node for a query graph.
+@return own: update node */
+UNIV_INTERN
+upd_node_t*
+upd_node_create(
+/*============*/
+ mem_heap_t* heap); /*!< in: mem heap where created */
+/***********************************************************//**
+Writes to the redo log the new values of the fields occurring in the index. */
+UNIV_INTERN
+void
+row_upd_index_write_log(
+/*====================*/
+ const upd_t* update, /*!< in: update vector */
+ byte* log_ptr,/*!< in: pointer to mlog buffer: must
+ contain at least MLOG_BUF_MARGIN bytes
+ of free space; the buffer is closed
+ within this function */
+ mtr_t* mtr); /*!< in: mtr into whose log to write */
+/***********************************************************//**
+Returns TRUE if row update changes size of some field in index or if some
+field to be updated is stored externally in rec or update.
+@return TRUE if the update changes the size of some field in index or
+the field is external in rec or update */
+UNIV_INTERN
+ibool
+row_upd_changes_field_size_or_external(
+/*===================================*/
+ dict_index_t* index, /*!< in: index */
+ const ulint* offsets,/*!< in: rec_get_offsets(rec, index) */
+ const upd_t* update);/*!< in: update vector */
+/***********************************************************//**
+Returns true if row update contains disowned external fields.
+@return true if the update contains disowned external fields. */
+UNIV_INTERN
+bool
+row_upd_changes_disowned_external(
+/*==============================*/
+ const upd_t* update) /*!< in: update vector */
+ __attribute__((nonnull, warn_unused_result));
+#endif /* !UNIV_HOTBACKUP */
+/***********************************************************//**
+Replaces the new column values stored in the update vector to the
+record given. No field size changes are allowed. This function is
+usually invoked on a clustered index. The only use case for a
+secondary index is row_ins_sec_index_entry_by_modify() or its
+counterpart in ibuf_insert_to_index_page(). */
+UNIV_INTERN
+void
+row_upd_rec_in_place(
+/*=================*/
+ rec_t* rec, /*!< in/out: record where replaced */
+ dict_index_t* index, /*!< in: the index the record belongs to */
+ const ulint* offsets,/*!< in: array returned by rec_get_offsets() */
+ const upd_t* update, /*!< in: update vector */
+ page_zip_des_t* page_zip);/*!< in: compressed page with enough space
+ available, or NULL */
+#ifndef UNIV_HOTBACKUP
+/***************************************************************//**
+Builds an update vector from those fields which in a secondary index entry
+differ from a record that has the equal ordering fields. NOTE: we compare
+the fields as binary strings!
+@return own: update vector of differing fields */
+UNIV_INTERN
+upd_t*
+row_upd_build_sec_rec_difference_binary(
+/*====================================*/
+ const rec_t* rec, /*!< in: secondary index record */
+ dict_index_t* index, /*!< in: index */
+ const ulint* offsets,/*!< in: rec_get_offsets(rec, index) */
+ const dtuple_t* entry, /*!< in: entry to insert */
+ mem_heap_t* heap) /*!< in: memory heap from which allocated */
+ __attribute__((warn_unused_result, nonnull));
+/***************************************************************//**
+Builds an update vector from those fields, excluding the roll ptr and
+trx id fields, which in an index entry differ from a record that has
+the equal ordering fields. NOTE: we compare the fields as binary strings!
+@return own: update vector of differing fields, excluding roll ptr and
+trx id */
+UNIV_INTERN
+const upd_t*
+row_upd_build_difference_binary(
+/*============================*/
+ dict_index_t* index, /*!< in: clustered index */
+ const dtuple_t* entry, /*!< in: entry to insert */
+ const rec_t* rec, /*!< in: clustered index record */
+ const ulint* offsets,/*!< in: rec_get_offsets(rec,index), or NULL */
+ bool no_sys, /*!< in: skip the system columns
+ DB_TRX_ID and DB_ROLL_PTR */
+ trx_t* trx, /*!< in: transaction (for diagnostics),
+ or NULL */
+ mem_heap_t* heap) /*!< in: memory heap from which allocated */
+ __attribute__((nonnull(1,2,3,7), warn_unused_result));
+/***********************************************************//**
+Replaces the new column values stored in the update vector to the index entry
+given. */
+UNIV_INTERN
+void
+row_upd_index_replace_new_col_vals_index_pos(
+/*=========================================*/
+ dtuple_t* entry, /*!< in/out: index entry where replaced;
+ the clustered index record must be
+ covered by a lock or a page latch to
+ prevent deletion (rollback or purge) */
+ dict_index_t* index, /*!< in: index; NOTE that this may also be a
+ non-clustered index */
+ const upd_t* update, /*!< in: an update vector built for the index so
+ that the field number in an upd_field is the
+ index position */
+ ibool order_only,
+ /*!< in: if TRUE, limit the replacement to
+ ordering fields of index; note that this
+ does not work for non-clustered indexes. */
+ mem_heap_t* heap) /*!< in: memory heap for allocating and
+ copying the new values */
+ __attribute__((nonnull));
+/***********************************************************//**
+Replaces the new column values stored in the update vector to the index entry
+given. */
+UNIV_INTERN
+void
+row_upd_index_replace_new_col_vals(
+/*===============================*/
+ dtuple_t* entry, /*!< in/out: index entry where replaced;
+ the clustered index record must be
+ covered by a lock or a page latch to
+ prevent deletion (rollback or purge) */
+ dict_index_t* index, /*!< in: index; NOTE that this may also be a
+ non-clustered index */
+ const upd_t* update, /*!< in: an update vector built for the
+ CLUSTERED index so that the field number in
+ an upd_field is the clustered index position */
+ mem_heap_t* heap) /*!< in: memory heap for allocating and
+ copying the new values */
+ __attribute__((nonnull));
+/***********************************************************//**
+Replaces the new column values stored in the update vector. */
+UNIV_INTERN
+void
+row_upd_replace(
+/*============*/
+ dtuple_t* row, /*!< in/out: row where replaced,
+ indexed by col_no;
+ the clustered index record must be
+ covered by a lock or a page latch to
+ prevent deletion (rollback or purge) */
+ row_ext_t** ext, /*!< out, own: NULL, or externally
+ stored column prefixes */
+ const dict_index_t* index, /*!< in: clustered index */
+ const upd_t* update, /*!< in: an update vector built for the
+ clustered index */
+ mem_heap_t* heap); /*!< in: memory heap */
+/***********************************************************//**
+Checks if an update vector changes an ordering field of an index record.
+
+This function is fast if the update vector is short or the number of ordering
+fields in the index is small. Otherwise, this can be quadratic.
+NOTE: we compare the fields as binary strings!
+@return TRUE if update vector changes an ordering field in the index record */
+UNIV_INTERN
+ibool
+row_upd_changes_ord_field_binary_func(
+/*==================================*/
+ dict_index_t* index, /*!< in: index of the record */
+ const upd_t* update, /*!< in: update vector for the row; NOTE: the
+ field numbers in this MUST be clustered index
+ positions! */
+#ifdef UNIV_DEBUG
+ const que_thr_t*thr, /*!< in: query thread */
+#endif /* UNIV_DEBUG */
+ const dtuple_t* row, /*!< in: old value of row, or NULL if the
+ row and the data values in update are not
+ known when this function is called, e.g., at
+ compile time */
+ const row_ext_t*ext) /*!< NULL, or prefixes of the externally
+ stored columns in the old row */
+ __attribute__((nonnull(1,2), warn_unused_result));
+#ifdef UNIV_DEBUG
+# define row_upd_changes_ord_field_binary(index,update,thr,row,ext) \
+ row_upd_changes_ord_field_binary_func(index,update,thr,row,ext)
+#else /* UNIV_DEBUG */
+# define row_upd_changes_ord_field_binary(index,update,thr,row,ext) \
+ row_upd_changes_ord_field_binary_func(index,update,row,ext)
+#endif /* UNIV_DEBUG */
+/***********************************************************//**
+Checks if an FTS indexed column is affected by an UPDATE.
+@return offset within fts_t::indexes if FTS indexed column updated else
+ULINT_UNDEFINED */
+UNIV_INTERN
+ulint
+row_upd_changes_fts_column(
+/*=======================*/
+ dict_table_t* table, /*!< in: table */
+ upd_field_t* upd_field); /*!< in: field to check */
+/***********************************************************//**
+Checks if an FTS Doc ID column is affected by an UPDATE.
+@return whether Doc ID column is affected */
+UNIV_INTERN
+bool
+row_upd_changes_doc_id(
+/*===================*/
+ dict_table_t* table, /*!< in: table */
+ upd_field_t* upd_field) /*!< in: field to check */
+ __attribute__((nonnull, warn_unused_result));
+/***********************************************************//**
+Checks if an update vector changes an ordering field of an index record.
+This function is fast if the update vector is short or the number of ordering
+fields in the index is small. Otherwise, this can be quadratic.
+NOTE: we compare the fields as binary strings!
+@return TRUE if update vector may change an ordering field in an index
+record */
+UNIV_INTERN
+ibool
+row_upd_changes_some_index_ord_field_binary(
+/*========================================*/
+ const dict_table_t* table, /*!< in: table */
+ const upd_t* update);/*!< in: update vector for the row */
+/***********************************************************//**
+Updates a row in a table. This is a high-level function used
+in SQL execution graphs.
+@return query thread to run next or NULL */
+UNIV_INTERN
+que_thr_t*
+row_upd_step(
+/*=========*/
+ que_thr_t* thr); /*!< in: query thread */
+#endif /* !UNIV_HOTBACKUP */
+/*********************************************************************//**
+Parses the log data of system field values.
+@return log data end or NULL */
+UNIV_INTERN
+byte*
+row_upd_parse_sys_vals(
+/*===================*/
+ byte* ptr, /*!< in: buffer */
+ byte* end_ptr,/*!< in: buffer end */
+ ulint* pos, /*!< out: TRX_ID position in record */
+ trx_id_t* trx_id, /*!< out: trx id */
+ roll_ptr_t* roll_ptr);/*!< out: roll ptr */
+/*********************************************************************//**
+Updates the trx id and roll ptr field in a clustered index record in database
+recovery. */
+UNIV_INTERN
+void
+row_upd_rec_sys_fields_in_recovery(
+/*===============================*/
+ rec_t* rec, /*!< in/out: record */
+ page_zip_des_t* page_zip,/*!< in/out: compressed page, or NULL */
+ const ulint* offsets,/*!< in: array returned by rec_get_offsets() */
+ ulint pos, /*!< in: TRX_ID position in rec */
+ trx_id_t trx_id, /*!< in: transaction id */
+ roll_ptr_t roll_ptr);/*!< in: roll ptr of the undo log record */
+/*********************************************************************//**
+Parses the log data written by row_upd_index_write_log.
+@return log data end or NULL */
+UNIV_INTERN
+byte*
+row_upd_index_parse(
+/*================*/
+ byte* ptr, /*!< in: buffer */
+ byte* end_ptr,/*!< in: buffer end */
+ mem_heap_t* heap, /*!< in: memory heap where update vector is
+ built */
+ upd_t** update_out);/*!< out: update vector */
+
+
+/* Update vector field */
+struct upd_field_t{
+ unsigned field_no:16; /*!< field number in an index, usually
+ the clustered index, but in updating
+ a secondary index record in btr0cur.cc
+ this is the position in the secondary
+ index */
+#ifndef UNIV_HOTBACKUP
+ unsigned orig_len:16; /*!< original length of the locally
+ stored part of an externally stored
+ column, or 0 */
+ que_node_t* exp; /*!< expression for calculating a new
+ value: it refers to column values and
+ constants in the symbol table of the
+ query graph */
+#endif /* !UNIV_HOTBACKUP */
+ dfield_t new_val; /*!< new value for the column */
+};
+
+/* Update vector structure */
+struct upd_t{
+ ulint info_bits; /*!< new value of info bits to record;
+ default is 0 */
+ ulint n_fields; /*!< number of update fields */
+ upd_field_t* fields; /*!< array of update fields */
+};
+
+#ifndef UNIV_HOTBACKUP
+/* Update node structure which also implements the delete operation
+of a row */
+
+struct upd_node_t{
+ que_common_t common; /*!< node type: QUE_NODE_UPDATE */
+ ibool is_delete;/* TRUE if delete, FALSE if update */
+ ibool searched_update;
+ /* TRUE if searched update, FALSE if
+ positioned */
+ ibool in_mysql_interface;
+ /* TRUE if the update node was created
+ for the MySQL interface */
+ dict_foreign_t* foreign;/* NULL or pointer to a foreign key
+ constraint if this update node is used in
+ doing an ON DELETE or ON UPDATE operation */
+ upd_node_t* cascade_node;/* NULL or an update node template which
+ is used to implement ON DELETE/UPDATE CASCADE
+ or ... SET NULL for foreign keys */
+ mem_heap_t* cascade_heap;/* NULL or a mem heap where the cascade
+ node is created */
+ sel_node_t* select; /*!< query graph subtree implementing a base
+ table cursor: the rows returned will be
+ updated */
+ btr_pcur_t* pcur; /*!< persistent cursor placed on the clustered
+ index record which should be updated or
+ deleted; the cursor is stored in the graph
+ of 'select' field above, except in the case
+ of the MySQL interface */
+ dict_table_t* table; /*!< table where updated */
+ upd_t* update; /*!< update vector for the row */
+ ulint update_n_fields;
+ /* when this struct is used to implement
+ a cascade operation for foreign keys, we store
+ here the size of the buffer allocated for use
+ as the update vector */
+ sym_node_list_t columns;/* symbol table nodes for the columns
+ to retrieve from the table */
+ ibool has_clust_rec_x_lock;
+ /* TRUE if the select which retrieves the
+ records to update already sets an x-lock on
+ the clustered record; note that it must always
+ set at least an s-lock */
+ ulint cmpl_info;/* information extracted during query
+ compilation; speeds up execution:
+ UPD_NODE_NO_ORD_CHANGE and
+ UPD_NODE_NO_SIZE_CHANGE, ORed */
+ /*----------------------*/
+ /* Local storage for this graph node */
+ ulint state; /*!< node execution state */
+ dict_index_t* index; /*!< NULL, or the next index whose record should
+ be updated */
+ dtuple_t* row; /*!< NULL, or a copy (also fields copied to
+ heap) of the row to update; this must be reset
+ to NULL after a successful update */
+ row_ext_t* ext; /*!< NULL, or prefixes of the externally
+ stored columns in the old row */
+ dtuple_t* upd_row;/* NULL, or a copy of the updated row */
+ row_ext_t* upd_ext;/* NULL, or prefixes of the externally
+ stored columns in upd_row */
+ mem_heap_t* heap; /*!< memory heap used as auxiliary storage;
+ this must be emptied after a successful
+ update */
+ /*----------------------*/
+ sym_node_t* table_sym;/* table node in symbol table */
+ que_node_t* col_assign_list;
+ /* column assignment list */
+ ulint magic_n;
+};
+
+#define UPD_NODE_MAGIC_N 1579975
+
+/* Node execution states */
+#define UPD_NODE_SET_IX_LOCK 1 /* execution came to the node from
+ a node above and if the field
+ has_clust_rec_x_lock is FALSE, we
+ should set an intention x-lock on
+ the table */
+#define UPD_NODE_UPDATE_CLUSTERED 2 /* clustered index record should be
+ updated */
+#define UPD_NODE_INSERT_CLUSTERED 3 /* clustered index record should be
+ inserted, old record is already delete
+ marked */
+#define UPD_NODE_INSERT_BLOB 4 /* clustered index record should be
+ inserted, old record is already
+ delete-marked; non-updated BLOBs
+ should be inherited by the new record
+ and disowned by the old record */
+#define UPD_NODE_UPDATE_ALL_SEC 5 /* an ordering field of the clustered
+ index record was changed, or this is
+ a delete operation: should update
+ all the secondary index records */
+#define UPD_NODE_UPDATE_SOME_SEC 6 /* secondary index entries should be
+ looked at and updated if an ordering
+ field changed */
+
+/* Compilation info flags: these must fit within 3 bits; see trx0rec.h */
+#define UPD_NODE_NO_ORD_CHANGE 1 /* no secondary index record will be
+ changed in the update and no ordering
+ field of the clustered index */
+#define UPD_NODE_NO_SIZE_CHANGE 2 /* no record field size will be
+ changed in the update */
+
+#endif /* !UNIV_HOTBACKUP */
+
+#ifndef UNIV_NONINL
+#include "row0upd.ic"
+#endif
+
+#endif