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Diffstat (limited to 'storage/innobase/include/row0types.h')
| -rw-r--r-- | storage/innobase/include/row0types.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/storage/innobase/include/row0types.h b/storage/innobase/include/row0types.h index cb0d280e78d..5f1e46c6a4d 100644 --- a/storage/innobase/include/row0types.h +++ b/storage/innobase/include/row0types.h @@ -1,6 +1,7 @@ /***************************************************************************** Copyright (c) 1996, 2012, Oracle and/or its affiliates. All Rights Reserved. +Copyright (c) 2018, MariaDB Corporation. 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 @@ -52,4 +53,98 @@ struct row_log_t; /* MySQL data types */ struct TABLE; +/** Purge virtual column node information. */ +struct purge_vcol_info_t +{ +private: + /** Is there a possible need to evaluate virtual columns? */ + bool requested; + /** Do we have to evaluate virtual columns (using mariadb_table)? */ + bool used; + + /** True if it is used for the first time. */ + bool first_use; + + /** MariaDB table opened for virtual column computation. */ + TABLE* mariadb_table; + +public: + /** Default constructor */ + purge_vcol_info_t() : + requested(false), used(false), first_use(false), + mariadb_table(NULL) + {} + /** Reset the state. */ + void reset() + { + requested = false; + used = false; + first_use = false; + mariadb_table = NULL; + } + + /** Validate the virtual column information. + @return true if the mariadb table opened successfully + or doesn't try to calculate virtual column. */ + bool validate() const { return !used || mariadb_table; } + + /** @return the table handle for evaluating virtual columns */ + TABLE* table() const { return mariadb_table; } + + /** Set the table handle for evaluating virtual columns. + @param[in] table table handle */ + void set_table(TABLE* table) + { + ut_ad(!table || is_first_fetch()); + mariadb_table = table; + } + + /** Note that virtual column information may be needed. */ + void set_requested() + { + ut_ad(!used); + ut_ad(!first_use); + ut_ad(!mariadb_table); + requested = true; + } + + /** @return whether the virtual column information may be needed */ + bool is_requested() const { return requested; } + + /** Note that the virtual column information is needed. */ + void set_used() + { + ut_ad(requested); + + if (first_use) { + first_use = false; + ut_ad(used); + return; + } + + if (!used) { + first_use = used = true; + } + } + + /** @return whether the virtual column information is needed */ + bool is_used() const + { + ut_ad(!first_use || used); + ut_ad(!used || requested); + ut_ad(used || !mariadb_table); + return used; + } + + /** Check whether it fetches mariadb table for the first time. + @return true if first time tries to open mariadb table. */ + bool is_first_fetch() const + { + ut_ad(!first_use || used); + ut_ad(!used || requested); + ut_ad(used || !mariadb_table); + return first_use; + } +}; + #endif |